/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2010. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* distribution of erlang messages to other nodes.
*/
/* define this to get a lot of debug output */
/* #define ERTS_DIST_MSG_DBG */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#define ERTS_WANT_EXTERNAL_TAGS
#include <stddef.h>
#include "sys.h"
#include "erl_vm.h"
#include "global.h"
#include "erl_process.h"
#include "error.h"
#include "dist.h"
#include "bif.h"
#include "external.h"
#include "erl_binary.h"
/* Turn this on to get printouts of all distribution messages
* which go on the line
*/
#if 0
#define ERTS_DIST_MSG_DBG
#endif
#if 0
#define ERTS_RAW_DIST_MSG_DBG
#endif
#if defined(ERTS_DIST_MSG_DBG) || defined(ERTS_RAW_DIST_MSG_DBG)
static void bw(byte *buf, int sz)
{
bin_write(ERTS_PRINT_STDERR,NULL,buf,sz);
}
#endif
#ifdef ERTS_DIST_MSG_DBG
static void
dist_msg_dbg(ErtsDistExternal *edep, char *what, byte *buf, int sz)
{
byte *extp = edep->extp;
Eterm msg;
Sint size = erts_decode_dist_ext_size(edep, 0);
if (size < 0) {
erts_fprintf(stderr,
"DIST MSG DEBUG: erts_decode_dist_ext_size(%s) failed:\n",
what);
bw(buf, sz);
}
else {
Eterm *hp;
ErlHeapFragment *mbuf = new_message_buffer(size);
hp = mbuf->mem;
msg = erts_decode_dist_ext(&hp, &mbuf->off_heap, edep);
if (is_value(msg))
erts_fprintf(stderr, " %s: %T\n", what, msg);
else {
erts_fprintf(stderr,
"DIST MSG DEBUG: erts_decode_dist_ext(%s) failed:\n",
what);
bw(buf, sz);
}
free_message_buffer(mbuf);
edep->extp = extp;
}
}
#endif
#define PASS_THROUGH 'p' /* This code should go */
int erts_is_alive; /* System must be blocked on change */
int erts_dist_buf_busy_limit;
/* distribution trap functions */
Export* dsend2_trap = NULL;
Export* dsend3_trap = NULL;
/*Export* dsend_nosuspend_trap = NULL;*/
Export* dlink_trap = NULL;
Export* dunlink_trap = NULL;
Export* dmonitor_node_trap = NULL;
Export* dgroup_leader_trap = NULL;
Export* dexit_trap = NULL;
Export* dmonitor_p_trap = NULL;
/* local variables */
/* forward declarations */
static void clear_dist_entry(DistEntry*);
static int dsig_send(ErtsDSigData *, Eterm, Eterm, int);
static void send_nodes_mon_msgs(Process *, Eterm, Eterm, Eterm, Eterm);
static void init_nodes_monitors(void);
static erts_smp_atomic_t no_caches;
static void
delete_cache(ErtsAtomCache *cache)
{
if (cache) {
erts_free(ERTS_ALC_T_DCACHE, (void *) cache);
ASSERT(erts_smp_atomic_read(&no_caches) > 0);
erts_smp_atomic_dec(&no_caches);
}
}
static void
create_cache(DistEntry *dep)
{
int i;
ErtsAtomCache *cp;
ERTS_SMP_LC_ASSERT(
is_internal_port(dep->cid)
&& erts_lc_is_port_locked(&erts_port[internal_port_index(dep->cid)]));
ASSERT(!dep->cache);
dep->cache = cp = (ErtsAtomCache*) erts_alloc(ERTS_ALC_T_DCACHE,
sizeof(ErtsAtomCache));
erts_smp_atomic_inc(&no_caches);
for (i = 0; i < sizeof(cp->in_arr)/sizeof(cp->in_arr[0]); i++) {
cp->in_arr[i] = THE_NON_VALUE;
cp->out_arr[i] = THE_NON_VALUE;
}
}
Uint erts_dist_cache_size(void)
{
return (Uint) erts_smp_atomic_read(&no_caches)*sizeof(ErtsAtomCache);
}
static ErtsProcList *
get_suspended_on_de(DistEntry *dep, Uint32 unset_qflgs)
{
ERTS_SMP_LC_ASSERT(erts_smp_lc_spinlock_is_locked(&dep->qlock));
dep->qflgs &= ~unset_qflgs;
if (dep->qflgs & ERTS_DE_QFLG_EXIT) {
/* No resume when exit has been scheduled */
return NULL;
}
else {
ErtsProcList *plp;
plp = dep->suspended.first;
dep->suspended.first = NULL;
dep->suspended.last = NULL;
return plp;
}
}
/*
** A full node name constists of a "n@h"
**
** n must be a valid node name: string of ([a-z][A-Z][0-9]_-)+
**
** h is not checked at all, we assume that we have a properly
** configured machine where the networking is ok for the OS
**
** We do check that there is not a second @ in the string, since
** many distributed operations are guaranteed not to work then.
*/
static int is_node_name(char *ptr, int len)
{
int c = '\0'; /* suppress use-before-set warning */
int pos = 0;
while (pos < len) {
c = ptr[pos++];
if (! ((c == '-') || (c == '_') ||
((c >= 'a') && (c <= 'z')) ||
((c >= 'A') && (c <= 'Z')) ||
((c >= '0') && (c <= '9'))))
break;
}
/* Scanned past the host name: now we want to see a '@', and there
should be text both before and after it. */
if (c != '@' || pos < 2 || pos == len)
return 0;
while (pos < len) {
c = ptr[pos++];
if (c == '@')
return 0;
}
return 1;
}
int is_node_name_atom(Eterm a)
{
int i;
if(is_not_atom(a))
return 0;
i = atom_val(a);
ASSERT((i > 0) && (i < atom_table_size()) && (atom_tab(i) != NULL));
return is_node_name((char*)atom_tab(i)->name, atom_tab(i)->len);
}
typedef struct {
DistEntry *dep;
Eterm *lhp;
} NetExitsContext;
/*
** This function is called when a distribution
** port or process terminates
*/
static void doit_monitor_net_exits(ErtsMonitor *mon, void *vnecp)
{
Process *rp;
ErtsMonitor *rmon;
DistEntry *dep = ((NetExitsContext *) vnecp)->dep;
ErtsProcLocks rp_locks = ERTS_PROC_LOCK_LINK;
rp = erts_pid2proc(NULL, 0, mon->pid, rp_locks);
if (!rp)
goto done;
if (mon->type == MON_ORIGIN) {
/* local pid is beeing monitored */
rmon = erts_remove_monitor(&(rp->monitors),mon->ref);
/* ASSERT(rmon != NULL); nope, can happen during process exit */
if (rmon != NULL) {
erts_destroy_monitor(rmon);
}
} else {
DeclareTmpHeapNoproc(lhp,3);
Eterm watched;
UseTmpHeapNoproc(3);
ASSERT(mon->type == MON_TARGET);
rmon = erts_remove_monitor(&(rp->monitors),mon->ref);
/* ASSERT(rmon != NULL); can happen during process exit */
if (rmon != NULL) {
ASSERT(is_atom(rmon->name) || is_nil(rmon->name));
watched = (is_atom(rmon->name)
? TUPLE2(lhp, rmon->name, dep->sysname)
: rmon->pid);
#ifdef ERTS_SMP
rp_locks |= ERTS_PROC_LOCKS_MSG_SEND;
erts_smp_proc_lock(rp, ERTS_PROC_LOCKS_MSG_SEND);
#endif
erts_queue_monitor_message(rp, &rp_locks, mon->ref, am_process,
watched, am_noconnection);
erts_destroy_monitor(rmon);
}
UnUseTmpHeapNoproc(3);
}
erts_smp_proc_unlock(rp, rp_locks);
done:
erts_destroy_monitor(mon);
}
typedef struct {
NetExitsContext *necp;
ErtsLink *lnk;
} LinkNetExitsContext;
/*
** This is the function actually doing the job of sending exit messages
** for links in a dist entry upon net_exit (the node goes down), NB,
** only process links, not node monitors are handled here,
** they reside in a separate tree....
*/
static void doit_link_net_exits_sub(ErtsLink *sublnk, void *vlnecp)
{
ErtsLink *lnk = ((LinkNetExitsContext *) vlnecp)->lnk; /* the local pid */
ErtsLink *rlnk;
Process *rp;
ASSERT(lnk->type == LINK_PID);
if (is_internal_pid(lnk->pid)) {
int xres;
ErtsProcLocks rp_locks = ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCKS_XSIG_SEND;
rp = erts_pid2proc(NULL, 0, lnk->pid, rp_locks);
if (!rp) {
goto done;
}
rlnk = erts_remove_link(&(rp->nlinks), sublnk->pid);
xres = erts_send_exit_signal(NULL,
sublnk->pid,
rp,
&rp_locks,
am_noconnection,
NIL,
NULL,
0);
if (rlnk) {
erts_destroy_link(rlnk);
if (xres >= 0 && IS_TRACED_FL(rp, F_TRACE_PROCS)) {
/* We didn't exit the process and it is traced */
trace_proc(NULL, rp, am_getting_unlinked, sublnk->pid);
}
}
erts_smp_proc_unlock(rp, rp_locks);
}
done:
erts_destroy_link(sublnk);
}
/*
** This function is called when a distribution
** port or process terminates, once for each link on the high level,
** it in turn traverses the link subtree for the specific link node...
*/
static void doit_link_net_exits(ErtsLink *lnk, void *vnecp)
{
LinkNetExitsContext lnec = {(NetExitsContext *) vnecp, lnk};
ASSERT(lnk->type == LINK_PID)
erts_sweep_links(ERTS_LINK_ROOT(lnk), &doit_link_net_exits_sub, (void *) &lnec);
#ifdef DEBUG
ERTS_LINK_ROOT(lnk) = NULL;
#endif
erts_destroy_link(lnk);
}
static void doit_node_link_net_exits(ErtsLink *lnk, void *vnecp)
{
DistEntry *dep = ((NetExitsContext *) vnecp)->dep;
Eterm name = dep->sysname;
Process *rp;
ErtsLink *rlnk;
Uint i,n;
ASSERT(lnk->type == LINK_NODE)
if (is_internal_pid(lnk->pid)) {
ErtsProcLocks rp_locks = ERTS_PROC_LOCK_LINK;
rp = erts_pid2proc(NULL, 0, lnk->pid, rp_locks);
if (!rp) {
goto done;
}
rlnk = erts_remove_link(&(rp->nlinks), name);
if (rlnk != NULL) {
ASSERT(is_atom(rlnk->pid) && (rlnk->type == LINK_NODE));
erts_destroy_link(rlnk);
}
n = ERTS_LINK_REFC(lnk);
for (i = 0; i < n; ++i) {
ErlHeapFragment* bp;
ErlOffHeap *ohp;
Eterm tup;
Eterm *hp = erts_alloc_message_heap(3,&bp,&ohp,rp,&rp_locks);
tup = TUPLE2(hp, am_nodedown, name);
erts_queue_message(rp, &rp_locks, bp, tup, NIL);
}
erts_smp_proc_unlock(rp, rp_locks);
}
done:
erts_destroy_link(lnk);
}
/*
* proc is currently running or exiting process.
*/
int erts_do_net_exits(DistEntry *dep, Eterm reason)
{
Eterm nodename;
if (dep == erts_this_dist_entry) { /* Net kernel has died (clean up!!) */
Eterm nd_reason = (reason == am_no_network
? am_no_network
: am_net_kernel_terminated);
erts_smp_rwmtx_rwlock(&erts_dist_table_rwmtx);
/* KILL all port controllers */
while(erts_visible_dist_entries || erts_hidden_dist_entries) {
DistEntry *tdep;
Eterm prt_id;
Port *prt;
if(erts_hidden_dist_entries)
tdep = erts_hidden_dist_entries;
else
tdep = erts_visible_dist_entries;
prt_id = tdep->cid;
ASSERT(is_internal_port(prt_id));
erts_smp_rwmtx_rwunlock(&erts_dist_table_rwmtx);
prt = erts_id2port(prt_id, NULL, 0);
if (prt) {
ASSERT(prt->status & ERTS_PORT_SFLG_DISTRIBUTION);
ASSERT(prt->dist_entry);
/* will call do_net_exists !!! */
erts_do_exit_port(prt, prt_id, nd_reason);
erts_port_release(prt);
}
erts_smp_rwmtx_rwlock(&erts_dist_table_rwmtx);
}
erts_smp_rwmtx_rwunlock(&erts_dist_table_rwmtx);
nodename = erts_this_dist_entry->sysname;
erts_smp_block_system(ERTS_BS_FLG_ALLOW_GC);
erts_set_this_node(am_Noname, 0);
erts_is_alive = 0;
send_nodes_mon_msgs(NULL, am_nodedown, nodename, am_visible, nd_reason);
erts_smp_release_system();
}
else { /* recursive call via erts_do_exit_port() will end up here */
NetExitsContext nec = {dep};
ErtsLink *nlinks;
ErtsLink *node_links;
ErtsMonitor *monitors;
Uint32 flags;
erts_smp_atomic_set(&dep->dist_cmd_scheduled, 1);
erts_smp_de_rwlock(dep);
ERTS_SMP_LC_ASSERT(is_internal_port(dep->cid)
&& erts_lc_is_port_locked(&erts_port[internal_port_index(dep->cid)]));
if (erts_port_task_is_scheduled(&dep->dist_cmd))
erts_port_task_abort(dep->cid, &dep->dist_cmd);
if (dep->status & ERTS_DE_SFLG_EXITING) {
#ifdef DEBUG
erts_smp_spin_lock(&dep->qlock);
ASSERT(dep->qflgs & ERTS_DE_QFLG_EXIT);
erts_smp_spin_unlock(&dep->qlock);
#endif
}
else {
dep->status |= ERTS_DE_SFLG_EXITING;
erts_smp_spin_lock(&dep->qlock);
ASSERT(!(dep->qflgs & ERTS_DE_QFLG_EXIT));
dep->qflgs |= ERTS_DE_QFLG_EXIT;
erts_smp_spin_unlock(&dep->qlock);
}
erts_smp_de_links_lock(dep);
monitors = dep->monitors;
nlinks = dep->nlinks;
node_links = dep->node_links;
dep->monitors = NULL;
dep->nlinks = NULL;
dep->node_links = NULL;
erts_smp_de_links_unlock(dep);
nodename = dep->sysname;
flags = dep->flags;
erts_set_dist_entry_not_connected(dep);
erts_smp_de_rwunlock(dep);
erts_sweep_monitors(monitors, &doit_monitor_net_exits, (void *) &nec);
erts_sweep_links(nlinks, &doit_link_net_exits, (void *) &nec);
erts_sweep_links(node_links, &doit_node_link_net_exits, (void *) &nec);
send_nodes_mon_msgs(NULL,
am_nodedown,
nodename,
flags & DFLAG_PUBLISHED ? am_visible : am_hidden,
reason == am_normal ? am_connection_closed : reason);
clear_dist_entry(dep);
}
return 1;
}
static Export*
trap_function(Eterm func, int arity)
{
return erts_export_put(am_erlang, func, arity);
}
void init_dist(void)
{
init_nodes_monitors();
erts_smp_atomic_init(&no_caches, 0);
/* Lookup/Install all references to trap functions */
dsend2_trap = trap_function(am_dsend,2);
dsend3_trap = trap_function(am_dsend,3);
/* dsend_nosuspend_trap = trap_function(am_dsend_nosuspend,2);*/
dlink_trap = trap_function(am_dlink,1);
dunlink_trap = trap_function(am_dunlink,1);
dmonitor_node_trap = trap_function(am_dmonitor_node,3);
dgroup_leader_trap = trap_function(am_dgroup_leader,2);
dexit_trap = trap_function(am_dexit, 2);
dmonitor_p_trap = trap_function(am_dmonitor_p, 2);
}
#define ErtsDistOutputBuf2Binary(OB) \
((Binary *) (((char *) (OB)) - offsetof(Binary, orig_bytes)))
static ERTS_INLINE ErtsDistOutputBuf *
alloc_dist_obuf(Uint size)
{
ErtsDistOutputBuf *obuf;
Uint obuf_size = sizeof(ErtsDistOutputBuf)+sizeof(byte)*(size-1);
Binary *bin = erts_bin_drv_alloc(obuf_size);
bin->flags = BIN_FLAG_DRV;
erts_refc_init(&bin->refc, 1);
bin->orig_size = (long) obuf_size;
obuf = (ErtsDistOutputBuf *) &bin->orig_bytes[0];
#ifdef DEBUG
obuf->dbg_pattern = ERTS_DIST_OUTPUT_BUF_DBG_PATTERN;
ASSERT(bin == ErtsDistOutputBuf2Binary(obuf));
#endif
return obuf;
}
static ERTS_INLINE void
free_dist_obuf(ErtsDistOutputBuf *obuf)
{
Binary *bin = ErtsDistOutputBuf2Binary(obuf);
ASSERT(obuf->dbg_pattern == ERTS_DIST_OUTPUT_BUF_DBG_PATTERN);
if (erts_refc_dectest(&bin->refc, 0) == 0)
erts_bin_free(bin);
}
static ERTS_INLINE Sint
size_obuf(ErtsDistOutputBuf *obuf)
{
Binary *bin = ErtsDistOutputBuf2Binary(obuf);
return bin->orig_size;
}
static void clear_dist_entry(DistEntry *dep)
{
Sint obufsize = 0;
ErtsAtomCache *cache;
ErtsProcList *suspendees;
ErtsDistOutputBuf *obuf;
erts_smp_de_rwlock(dep);
cache = dep->cache;
dep->cache = NULL;
#ifdef DEBUG
erts_smp_de_links_lock(dep);
ASSERT(!dep->nlinks);
ASSERT(!dep->node_links);
ASSERT(!dep->monitors);
erts_smp_de_links_unlock(dep);
#endif
erts_smp_spin_lock(&dep->qlock);
if (!dep->out_queue.last)
obuf = dep->finalized_out_queue.first;
else {
dep->out_queue.last->next = dep->finalized_out_queue.first;
obuf = dep->out_queue.first;
}
dep->out_queue.first = NULL;
dep->out_queue.last = NULL;
dep->finalized_out_queue.first = NULL;
dep->finalized_out_queue.last = NULL;
dep->status = 0;
suspendees = get_suspended_on_de(dep, ERTS_DE_QFLGS_ALL);
erts_smp_spin_unlock(&dep->qlock);
erts_smp_atomic_set(&dep->dist_cmd_scheduled, 0);
dep->send = NULL;
erts_smp_de_rwunlock(dep);
erts_resume_processes(suspendees);
delete_cache(cache);
while (obuf) {
ErtsDistOutputBuf *fobuf;
fobuf = obuf;
obuf = obuf->next;
obufsize += size_obuf(fobuf);
free_dist_obuf(fobuf);
}
if (obufsize) {
erts_smp_spin_lock(&dep->qlock);
ASSERT(dep->qsize >= obufsize);
dep->qsize -= obufsize;
erts_smp_spin_unlock(&dep->qlock);
}
}
/*
* The erts_dsig_send_*() functions implemented below, sends asynchronous
* distributed signals to other Erlang nodes. Before sending a distributed
* signal, you need to prepare the operation by calling erts_dsig_prepare()
* (see dist.h).
*
* Note that the distributed signal send operation is truly asynchronous,
* and the signal is not guaranteed to reach the receiver if the connection
* goes down before the signal has reached the receiver.
*/
/*
** Send a DOP_LINK link message
*/
int
erts_dsig_send_link(ErtsDSigData *dsdp, Eterm local, Eterm remote)
{
DeclareTmpHeapNoproc(ctl_heap,4);
Eterm ctl = TUPLE3(&ctl_heap[0], make_small(DOP_LINK), local, remote);
int res;
UseTmpHeapNoproc(4);
res = dsig_send(dsdp, ctl, THE_NON_VALUE, 0);
UnUseTmpHeapNoproc(4);
return res;
}
int
erts_dsig_send_unlink(ErtsDSigData *dsdp, Eterm local, Eterm remote)
{
DeclareTmpHeapNoproc(ctl_heap,4);
Eterm ctl = TUPLE3(&ctl_heap[0], make_small(DOP_UNLINK), local, remote);
int res;
UseTmpHeapNoproc(4);
res = dsig_send(dsdp, ctl, THE_NON_VALUE, 0);
UnUseTmpHeapNoproc(4);
return res;
}
/* A local process that's beeing monitored by a remote one exits. We send:
{DOP_MONITOR_P_EXIT, Local pid or name, Remote pid, ref, reason},
which is rather sad as only the ref is needed, no pid's... */
int
erts_dsig_send_m_exit(ErtsDSigData *dsdp, Eterm watcher, Eterm watched,
Eterm ref, Eterm reason)
{
Eterm ctl;
DeclareTmpHeapNoproc(ctl_heap,6);
int res;
UseTmpHeapNoproc(6);
ctl = TUPLE5(&ctl_heap[0], make_small(DOP_MONITOR_P_EXIT),
watched, watcher, ref, reason);
#ifdef DEBUG
erts_smp_de_links_lock(dsdp->dep);
ASSERT(!erts_lookup_monitor(dsdp->dep->monitors, ref));
erts_smp_de_links_unlock(dsdp->dep);
#endif
res = dsig_send(dsdp, ctl, THE_NON_VALUE, 1);
UnUseTmpHeapNoproc(6);
return res;
}
/* We want to monitor a process (named or unnamed) on another node, we send:
{DOP_MONITOR_P, Local pid, Remote pid or name, Ref}, which is exactly what's
needed on the other side... */
int
erts_dsig_send_monitor(ErtsDSigData *dsdp, Eterm watcher, Eterm watched,
Eterm ref)
{
Eterm ctl;
DeclareTmpHeapNoproc(ctl_heap,5);
int res;
UseTmpHeapNoproc(5);
ctl = TUPLE4(&ctl_heap[0],
make_small(DOP_MONITOR_P),
watcher, watched, ref);
res = dsig_send(dsdp, ctl, THE_NON_VALUE, 0);
UnUseTmpHeapNoproc(5);
return res;
}
/* A local process monitoring a remote one wants to stop monitoring, either
because of a demonitor bif call or because the local process died. We send
{DOP_DEMONITOR_P, Local pid, Remote pid or name, ref}, which is once again
rather redundant as only the ref will be needed on the other side... */
int
erts_dsig_send_demonitor(ErtsDSigData *dsdp, Eterm watcher,
Eterm watched, Eterm ref, int force)
{
Eterm ctl;
DeclareTmpHeapNoproc(ctl_heap,5);
int res;
UseTmpHeapNoproc(5);
ctl = TUPLE4(&ctl_heap[0],
make_small(DOP_DEMONITOR_P),
watcher, watched, ref);
res = dsig_send(dsdp, ctl, THE_NON_VALUE, force);
UnUseTmpHeapNoproc(5);
return res;
}
int
erts_dsig_send_msg(ErtsDSigData *dsdp, Eterm remote, Eterm message)
{
Eterm ctl;
DeclareTmpHeapNoproc(ctl_heap,5);
Eterm token = NIL;
Process *sender = dsdp->proc;
int res;
UseTmpHeapNoproc(5);
if (SEQ_TRACE_TOKEN(sender) != NIL) {
seq_trace_update_send(sender);
token = SEQ_TRACE_TOKEN(sender);
seq_trace_output(token, message, SEQ_TRACE_SEND, remote, sender);
}
if (token != NIL)
ctl = TUPLE4(&ctl_heap[0],
make_small(DOP_SEND_TT), am_Cookie, remote, token);
else
ctl = TUPLE3(&ctl_heap[0], make_small(DOP_SEND), am_Cookie, remote);
res = dsig_send(dsdp, ctl, message, 0);
UnUseTmpHeapNoproc(5);
return res;
}
int
erts_dsig_send_reg_msg(ErtsDSigData *dsdp, Eterm remote_name, Eterm message)
{
Eterm ctl;
DeclareTmpHeapNoproc(ctl_heap,6);
Eterm token = NIL;
Process *sender = dsdp->proc;
int res;
UseTmpHeapNoproc(6);
if (SEQ_TRACE_TOKEN(sender) != NIL) {
seq_trace_update_send(sender);
token = SEQ_TRACE_TOKEN(sender);
seq_trace_output(token, message, SEQ_TRACE_SEND, remote_name, sender);
}
if (token != NIL)
ctl = TUPLE5(&ctl_heap[0], make_small(DOP_REG_SEND_TT),
sender->id, am_Cookie, remote_name, token);
else
ctl = TUPLE4(&ctl_heap[0], make_small(DOP_REG_SEND),
sender->id, am_Cookie, remote_name);
res = dsig_send(dsdp, ctl, message, 0);
UnUseTmpHeapNoproc(6);
return res;
}
/* local has died, deliver the exit signal to remote */
int
erts_dsig_send_exit_tt(ErtsDSigData *dsdp, Eterm local, Eterm remote,
Eterm reason, Eterm token)
{
Eterm ctl;
DeclareTmpHeapNoproc(ctl_heap,6);
int res;
UseTmpHeapNoproc(6);
if (token != NIL) {
seq_trace_update_send(dsdp->proc);
seq_trace_output_exit(token, reason, SEQ_TRACE_SEND, remote, local);
ctl = TUPLE5(&ctl_heap[0],
make_small(DOP_EXIT_TT), local, remote, token, reason);
} else {
ctl = TUPLE4(&ctl_heap[0], make_small(DOP_EXIT), local, remote, reason);
}
/* forced, i.e ignore busy */
res = dsig_send(dsdp, ctl, THE_NON_VALUE, 1);
UnUseTmpHeapNoproc(6);
return res;
}
int
erts_dsig_send_exit(ErtsDSigData *dsdp, Eterm local, Eterm remote, Eterm reason)
{
DeclareTmpHeapNoproc(ctl_heap,5);
int res;
Eterm ctl;
UseTmpHeapNoproc(5);
ctl = TUPLE4(&ctl_heap[0],
make_small(DOP_EXIT), local, remote, reason);
/* forced, i.e ignore busy */
res = dsig_send(dsdp, ctl, THE_NON_VALUE, 1);
UnUseTmpHeapNoproc(5);
return res;
}
int
erts_dsig_send_exit2(ErtsDSigData *dsdp, Eterm local, Eterm remote, Eterm reason)
{
DeclareTmpHeapNoproc(ctl_heap,5);
int res;
Eterm ctl;
UseTmpHeapNoproc(5);
ctl = TUPLE4(&ctl_heap[0],
make_small(DOP_EXIT2), local, remote, reason);
res = dsig_send(dsdp, ctl, THE_NON_VALUE, 0);
UnUseTmpHeapNoproc(5);
return res;
}
int
erts_dsig_send_group_leader(ErtsDSigData *dsdp, Eterm leader, Eterm remote)
{
DeclareTmpHeapNoproc(ctl_heap,4);
int res;
Eterm ctl;
UseTmpHeapNoproc(4);
ctl = TUPLE3(&ctl_heap[0],
make_small(DOP_GROUP_LEADER), leader, remote);
res = dsig_send(dsdp, ctl, THE_NON_VALUE, 0);
UnUseTmpHeapNoproc(4);
return res;
}
#if defined(PURIFY)
# define PURIFY_MSG(msg) \
purify_printf("%s, line %d: %s", __FILE__, __LINE__, msg)
#elif defined(VALGRIND)
#include <valgrind/valgrind.h>
#include <valgrind/memcheck.h>
# define PURIFY_MSG(msg) \
do { \
char buf__[1]; size_t bufsz__ = sizeof(buf__); \
if (erts_sys_getenv("VALGRIND_LOG_XML", buf__, &bufsz__) >= 0) { \
VALGRIND_PRINTF("<erlang_error_log>" \
"%s, line %d: %s</erlang_error_log>\n", \
__FILE__, __LINE__, msg); \
} else { \
VALGRIND_PRINTF("%s, line %d: %s", __FILE__, __LINE__, msg); \
} \
} while (0)
#else
# define PURIFY_MSG(msg)
#endif
/*
** Input from distribution port.
** Input follows the distribution protocol v4.5
**
** The protocol is a 4 byte header protocol
** the DOP_DATA is stripped by driver_output
**
** assert hlen == 0 !!!
*/
int erts_net_message(Port *prt,
DistEntry *dep,
byte *hbuf,
int hlen,
byte *buf,
int len)
{
#define DIST_CTL_DEFAULT_SIZE 64
ErtsDistExternal ede;
byte *t;
Sint ctl_len;
int orig_ctl_len;
Eterm arg;
Eterm from, to;
Eterm watcher, watched;
Eterm ref;
Eterm *tuple;
Eterm reason;
Process* rp;
DeclareTmpHeapNoproc(ctl_default,DIST_CTL_DEFAULT_SIZE);
Eterm* ctl = ctl_default;
ErlOffHeap off_heap;
Eterm* hp;
Sint type;
Eterm token;
Eterm token_size;
ErtsMonitor *mon;
ErtsLink *lnk;
int res;
#ifdef ERTS_DIST_MSG_DBG
int orig_len = len;
#endif
UseTmpHeapNoproc(DIST_CTL_DEFAULT_SIZE);
/* Thanks to Luke Gorrie */
off_heap.first = NULL;
off_heap.overhead = 0;
ERTS_SMP_CHK_NO_PROC_LOCKS;
ERTS_SMP_LC_ASSERT(erts_lc_is_port_locked(prt));
if (!erts_is_alive) {
UnUseTmpHeapNoproc(DIST_CTL_DEFAULT_SIZE);
return 0;
}
if (hlen > 0)
goto data_error;
if (len == 0) { /* HANDLE TICK !!! */
UnUseTmpHeapNoproc(DIST_CTL_DEFAULT_SIZE);
return 0;
}
#ifdef ERTS_RAW_DIST_MSG_DBG
erts_fprintf(stderr, "<< ");
bw(buf, len);
#endif
if (dep->flags & DFLAG_DIST_HDR_ATOM_CACHE)
t = buf;
else {
/* Skip PASS_THROUGH */
t = buf+1;
len--;
}
if (len == 0) {
PURIFY_MSG("data error");
goto data_error;
}
res = erts_prepare_dist_ext(&ede, t, len, dep, dep->cache);
if (res >= 0)
res = ctl_len = erts_decode_dist_ext_size(&ede, 0);
else {
#ifdef ERTS_DIST_MSG_DBG
erts_fprintf(stderr, "DIST MSG DEBUG: erts_prepare_dist_ext() failed:\n");
bw(buf, orig_len);
#endif
ctl_len = 0;
}
if (res < 0) {
#ifdef ERTS_DIST_MSG_DBG
erts_fprintf(stderr, "DIST MSG DEBUG: erts_decode_dist_ext_size(CTL) failed:\n");
bw(buf, orig_len);
#endif
PURIFY_MSG("data error");
goto data_error;
}
orig_ctl_len = ctl_len;
if (ctl_len > DIST_CTL_DEFAULT_SIZE) {
ctl = erts_alloc(ERTS_ALC_T_DCTRL_BUF, ctl_len * sizeof(Eterm));
}
hp = ctl;
arg = erts_decode_dist_ext(&hp, &off_heap, &ede);
if (is_non_value(arg)) {
#ifdef ERTS_DIST_MSG_DBG
erts_fprintf(stderr, "DIST MSG DEBUG: erts_dist_ext_size(CTL) failed:\n");
bw(buf, orig_len);
#endif
PURIFY_MSG("data error");
goto data_error;
}
ctl_len = t - buf;
#ifdef ERTS_DIST_MSG_DBG
erts_fprintf(stderr, "<<%s CTL: %T\n", len != orig_len ? "P" : " ", arg);
#endif
if (is_not_tuple(arg) ||
(tuple = tuple_val(arg), arityval(*tuple) < 1) ||
is_not_small(tuple[1])) {
erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf();
erts_dsprintf(dsbufp, "Invalid distribution message: %.200T", arg);
erts_send_error_to_logger_nogl(dsbufp);
goto data_error;
}
token_size = 0;
switch (type = unsigned_val(tuple[1])) {
case DOP_LINK:
from = tuple[2];
to = tuple[3]; /* local proc to link to */
if (is_not_pid(from) || is_not_pid(to)) {
erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf();
PURIFY_MSG("data error");
erts_dsprintf(dsbufp,
"Invalid DOP_LINK distribution message: %.200T",
arg);
erts_send_error_to_logger_nogl(dsbufp);
goto data_error;
}
rp = erts_pid2proc_opt(NULL, 0,
to, ERTS_PROC_LOCK_LINK,
ERTS_P2P_FLG_ALLOW_OTHER_X);
if (!rp) {
/* This is tricky (we MUST force a distributed send) */
ErtsDSigData dsd;
int code;
code = erts_dsig_prepare(&dsd, dep, NULL, ERTS_DSP_NO_LOCK, 0);
if (code == ERTS_DSIG_PREP_CONNECTED) {
code = erts_dsig_send_exit(&dsd, to, from, am_noproc);
ASSERT(code == ERTS_DSIG_SEND_OK);
}
break;
}
erts_smp_de_links_lock(dep);
res = erts_add_link(&(rp->nlinks), LINK_PID, from);
if (res < 0) {
/* It was already there! Lets skip the rest... */
erts_smp_de_links_unlock(dep);
erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_LINK);
break;
}
lnk = erts_add_or_lookup_link(&(dep->nlinks), LINK_PID, rp->id);
erts_add_link(&(ERTS_LINK_ROOT(lnk)), LINK_PID, from);
erts_smp_de_links_unlock(dep);
if (IS_TRACED_FL(rp, F_TRACE_PROCS))
trace_proc(NULL, rp, am_getting_linked, from);
erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_LINK);
break;
case DOP_UNLINK: {
ErtsDistLinkData dld;
from = tuple[2];
to = tuple[3];
rp = erts_pid2proc_opt(NULL, 0,
to, ERTS_PROC_LOCK_LINK,
ERTS_P2P_FLG_ALLOW_OTHER_X);
if (!rp)
break;
lnk = erts_remove_link(&(rp->nlinks), from);
if (IS_TRACED_FL(rp, F_TRACE_PROCS) && lnk != NULL) {
trace_proc(NULL, rp, am_getting_unlinked, from);
}
erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_LINK);
erts_remove_dist_link(&dld, to, from, dep);
erts_destroy_dist_link(&dld);
if (lnk)
erts_destroy_link(lnk);
break;
}
case DOP_MONITOR_P: {
/* A remote process wants to monitor us, we get:
{DOP_MONITOR_P, Remote pid, local pid or name, ref} */
Eterm name;
watcher = tuple[2];
watched = tuple[3]; /* local proc to monitor */
ref = tuple[4];
if (is_atom(watched)) {
name = watched;
rp = erts_whereis_process(NULL, 0,
watched, ERTS_PROC_LOCK_LINK,
ERTS_P2P_FLG_ALLOW_OTHER_X);
}
else {
name = NIL;
rp = erts_pid2proc_opt(NULL, 0,
watched, ERTS_PROC_LOCK_LINK,
ERTS_P2P_FLG_ALLOW_OTHER_X);
}
if (!rp) {
ErtsDSigData dsd;
int code;
code = erts_dsig_prepare(&dsd, dep, NULL, ERTS_DSP_NO_LOCK, 0);
if (code == ERTS_DSIG_PREP_CONNECTED) {
code = erts_dsig_send_m_exit(&dsd, watcher, watched, ref,
am_noproc);
ASSERT(code == ERTS_DSIG_SEND_OK);
}
}
else {
if (is_atom(watched))
watched = rp->id;
erts_smp_de_links_lock(dep);
erts_add_monitor(&(dep->monitors), MON_ORIGIN, ref, watched, name);
erts_add_monitor(&(rp->monitors), MON_TARGET, ref, watcher, name);
erts_smp_de_links_unlock(dep);
erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_LINK);
}
break;
}
case DOP_DEMONITOR_P:
/* A remote node informs us that a local pid in no longer monitored
We get {DOP_DEMONITOR_P, Remote pid, Local pid or name, ref},
We need only the ref of course */
/* watcher = tuple[2]; */
/* watched = tuple[3]; May be an atom in case of monitor name */
ref = tuple[4];
erts_smp_de_links_lock(dep);
mon = erts_remove_monitor(&(dep->monitors),ref);
erts_smp_de_links_unlock(dep);
/* ASSERT(mon != NULL); can happen in case of broken dist message */
if (mon == NULL) {
break;
}
watched = mon->pid;
erts_destroy_monitor(mon);
rp = erts_pid2proc_opt(NULL, 0,
watched, ERTS_PROC_LOCK_LINK,
ERTS_P2P_FLG_ALLOW_OTHER_X);
if (!rp) {
break;
}
mon = erts_remove_monitor(&(rp->monitors),ref);
erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_LINK);
ASSERT(mon != NULL);
if (mon == NULL) {
break;
}
erts_destroy_monitor(mon);
break;
case DOP_NODE_LINK: /* XXX never sent ?? */
break;
case DOP_REG_SEND_TT:
token_size = size_object(tuple[5]);
/* Fall through ... */
case DOP_REG_SEND:
/* {DOP_REG_SEND, From, Cookie, ToName} -- Message */
/* {DOP_REG_SEND_TT, From, Cookie, ToName, TraceToken} -- Message */
/*
* There is intentionally no testing of the cookie (it is always '')
* from R9B and onwards.
*/
#ifdef ERTS_DIST_MSG_DBG
dist_msg_dbg(&ede, "MSG", buf, orig_len);
#endif
from = tuple[2];
to = tuple[4];
rp = erts_whereis_process(NULL, 0, to, 0, ERTS_P2P_FLG_SMP_INC_REFC);
if (rp) {
Uint xsize = (type == DOP_REG_SEND
? 0
: ERTS_HEAP_FRAG_SIZE(token_size));
ErtsProcLocks locks = 0;
ErtsDistExternal *ede_copy;
ede_copy = erts_make_dist_ext_copy(&ede, xsize);
if (type == DOP_REG_SEND) {
token = NIL;
} else {
ErlHeapFragment *heap_frag;
ErlOffHeap *ohp;
ASSERT(xsize);
heap_frag = erts_dist_ext_trailer(ede_copy);
ERTS_INIT_HEAP_FRAG(heap_frag, token_size);
hp = heap_frag->mem;
ohp = &heap_frag->off_heap;
token = tuple[5];
token = copy_struct(token, token_size, &hp, ohp);
}
erts_queue_dist_message(rp, &locks, ede_copy, token);
if (locks)
erts_smp_proc_unlock(rp, locks);
erts_smp_proc_dec_refc(rp);
}
break;
case DOP_SEND_TT:
token_size = size_object(tuple[4]);
/* Fall through ... */
case DOP_SEND:
/*
* There is intentionally no testing of the cookie (it is always '')
* from R9B and onwards.
*/
#ifdef ERTS_DIST_MSG_DBG
dist_msg_dbg(&ede, "MSG", buf, orig_len);
#endif
to = tuple[3];
rp = erts_pid2proc_opt(NULL, 0, to, 0, ERTS_P2P_FLG_SMP_INC_REFC);
if (rp) {
Uint xsize = type == DOP_SEND ? 0 : ERTS_HEAP_FRAG_SIZE(token_size);
ErtsProcLocks locks = 0;
ErtsDistExternal *ede_copy;
ede_copy = erts_make_dist_ext_copy(&ede, xsize);
if (type == DOP_SEND) {
token = NIL;
} else {
ErlHeapFragment *heap_frag;
ErlOffHeap *ohp;
ASSERT(xsize);
heap_frag = erts_dist_ext_trailer(ede_copy);
ERTS_INIT_HEAP_FRAG(heap_frag, token_size);
hp = heap_frag->mem;
ohp = &heap_frag->off_heap;
token = tuple[4];
token = copy_struct(token, token_size, &hp, ohp);
}
erts_queue_dist_message(rp, &locks, ede_copy, token);
if (locks)
erts_smp_proc_unlock(rp, locks);
erts_smp_proc_dec_refc(rp);
}
break;
case DOP_MONITOR_P_EXIT: {
/* We are monitoring a process on the remote node which dies, we get
{DOP_MONITOR_P_EXIT, Remote pid or name, Local pid, ref, reason} */
DeclareTmpHeapNoproc(lhp,3);
Eterm sysname;
ErtsProcLocks rp_locks = ERTS_PROC_LOCKS_MSG_SEND|ERTS_PROC_LOCK_LINK;
/* watched = tuple[2]; */ /* remote proc which died */
/* watcher = tuple[3]; */
ref = tuple[4];
reason = tuple[5];
erts_smp_de_links_lock(dep);
sysname = dep->sysname;
mon = erts_remove_monitor(&(dep->monitors), ref);
/*
* If demonitor was performed at the same time as the
* monitored process exits, monitoring side will have
* removed info about monitor. In this case, do nothing
* and everything will be as it should.
*/
erts_smp_de_links_unlock(dep);
if (mon == NULL) {
break;
}
rp = erts_pid2proc(NULL, 0, mon->pid, rp_locks);
if (rp == NULL) {
break;
}
erts_destroy_monitor(mon);
mon = erts_remove_monitor(&(rp->monitors),ref);
if (mon == NULL) {
erts_smp_proc_unlock(rp, rp_locks);
break;
}
UseTmpHeapNoproc(3);
watched = (is_not_nil(mon->name)
? TUPLE2(&lhp[0], mon->name, sysname)
: mon->pid);
erts_queue_monitor_message(rp, &rp_locks,
ref, am_process, watched, reason);
erts_smp_proc_unlock(rp, rp_locks);
erts_destroy_monitor(mon);
UnUseTmpHeapNoproc(3);
break;
}
case DOP_EXIT_TT:
case DOP_EXIT: {
ErtsDistLinkData dld;
ErtsProcLocks rp_locks = ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCKS_XSIG_SEND;
/* 'from', which 'to' is linked to, died */
if (type == DOP_EXIT) {
from = tuple[2];
to = tuple[3];
reason = tuple[4];
token = NIL;
} else {
from = tuple[2];
to = tuple[3];
token = tuple[4];
reason = tuple[5];
}
if (is_not_internal_pid(to)) {
erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf();
PURIFY_MSG("data error");
erts_dsprintf(dsbufp,
"Invalid DOP_EXIT distribution message: %.200T",
arg);
erts_send_error_to_logger_nogl(dsbufp);
goto data_error;
}
rp = erts_pid2proc(NULL, 0, to, rp_locks);
if (!rp)
lnk = NULL;
else {
lnk = erts_remove_link(&(rp->nlinks), from);
/* If lnk == NULL, we have unlinked on this side, i.e.
* ignore exit.
*/
if (lnk) {
int xres;
#if 0
/* Arndt: Maybe it should never be 'kill', but it can be,
namely when a linked process does exit(kill). Until we know
whether that is incorrect and what should happen instead,
we leave the assertion out. */
ASSERT(reason != am_kill); /* should never be kill (killed) */
#endif
xres = erts_send_exit_signal(NULL,
from,
rp,
&rp_locks,
reason,
token,
NULL,
ERTS_XSIG_FLG_IGN_KILL);
if (xres >= 0 && IS_TRACED_FL(rp, F_TRACE_PROCS)) {
/* We didn't exit the process and it is traced */
trace_proc(NULL, rp, am_getting_unlinked, from);
}
}
erts_smp_proc_unlock(rp, rp_locks);
}
erts_remove_dist_link(&dld, to, from, dep);
if (lnk)
erts_destroy_link(lnk);
erts_destroy_dist_link(&dld);
break;
}
case DOP_EXIT2_TT:
case DOP_EXIT2: {
ErtsProcLocks rp_locks = ERTS_PROC_LOCKS_XSIG_SEND;
/* 'from' is send an exit signal to 'to' */
if (type == DOP_EXIT2) {
from = tuple[2];
to = tuple[3];
reason = tuple[4];
token = NIL;
} else {
from = tuple[2];
to = tuple[3];
token = tuple[4];
reason = tuple[5];
}
rp = erts_pid2proc_opt(NULL, 0, to, rp_locks,
ERTS_P2P_FLG_SMP_INC_REFC);
if (rp) {
(void) erts_send_exit_signal(NULL,
from,
rp,
&rp_locks,
reason,
token,
NULL,
0);
erts_smp_proc_unlock(rp, rp_locks);
erts_smp_proc_dec_refc(rp);
}
break;
}
case DOP_GROUP_LEADER:
from = tuple[2]; /* Group leader */
to = tuple[3]; /* new member */
if (is_not_pid(from))
break;
rp = erts_pid2proc(NULL, 0, to, ERTS_PROC_LOCK_MAIN);
if (!rp)
break;
rp->group_leader = STORE_NC_IN_PROC(rp, from);
erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_MAIN);
break;
default: {
erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf();
erts_dsprintf(dsbufp,
"Illegal value in distribution dispatch switch: "
"%.200T",
arg);
erts_send_error_to_logger_nogl(dsbufp);
PURIFY_MSG("data error");
goto data_error;
}
}
erts_cleanup_offheap(&off_heap);
#ifndef HYBRID /* FIND ME! */
if (ctl != ctl_default) {
erts_free(ERTS_ALC_T_DCTRL_BUF, (void *) ctl);
}
#endif
UnUseTmpHeapNoproc(DIST_CTL_DEFAULT_SIZE);
ERTS_SMP_CHK_NO_PROC_LOCKS;
return 0;
data_error:
erts_cleanup_offheap(&off_heap);
#ifndef HYBRID /* FIND ME! */
if (ctl != ctl_default) {
erts_free(ERTS_ALC_T_DCTRL_BUF, (void *) ctl);
}
#endif
UnUseTmpHeapNoproc(DIST_CTL_DEFAULT_SIZE);
erts_do_exit_port(prt, dep->cid, am_killed);
ERTS_SMP_CHK_NO_PROC_LOCKS;
return -1;
}
static int
dsig_send(ErtsDSigData *dsdp, Eterm ctl, Eterm msg, int force_busy)
{
Eterm cid;
int suspended = 0;
int resume = 0;
Uint32 pass_through_size;
Uint data_size, dhdr_ext_size;
ErtsAtomCacheMap *acmp;
ErtsDistOutputBuf *obuf;
DistEntry *dep = dsdp->dep;
Uint32 flags = dep->flags;
Process *c_p = dsdp->proc;
if (!c_p || dsdp->no_suspend)
force_busy = 1;
ERTS_SMP_LC_ASSERT(!c_p
|| (ERTS_PROC_LOCK_MAIN
== erts_proc_lc_my_proc_locks(c_p)));
if (!erts_is_alive)
return ERTS_DSIG_SEND_OK;
if (flags & DFLAG_DIST_HDR_ATOM_CACHE) {
acmp = erts_get_atom_cache_map(c_p);
pass_through_size = 0;
}
else {
acmp = NULL;
pass_through_size = 1;
}
#ifdef ERTS_DIST_MSG_DBG
erts_fprintf(stderr, ">>%s CTL: %T\n", pass_through_size ? "P" : " ", ctl);
if (is_value(msg))
erts_fprintf(stderr, " MSG: %T\n", msg);
#endif
data_size = pass_through_size;
erts_reset_atom_cache_map(acmp);
data_size += erts_encode_dist_ext_size(ctl, flags, acmp);
if (is_value(msg))
data_size += erts_encode_dist_ext_size(msg, flags, acmp);
erts_finalize_atom_cache_map(acmp);
dhdr_ext_size = erts_encode_ext_dist_header_size(acmp);
data_size += dhdr_ext_size;
obuf = alloc_dist_obuf(data_size);
obuf->ext_endp = &obuf->data[0] + pass_through_size + dhdr_ext_size;
/* Encode internal version of dist header */
obuf->extp = erts_encode_ext_dist_header_setup(obuf->ext_endp, acmp);
/* Encode control message */
erts_encode_dist_ext(ctl, &obuf->ext_endp, flags, acmp);
if (is_value(msg)) {
/* Encode message */
erts_encode_dist_ext(msg, &obuf->ext_endp, flags, acmp);
}
ASSERT(obuf->extp < obuf->ext_endp);
ASSERT(&obuf->data[0] <= obuf->extp - pass_through_size);
ASSERT(obuf->ext_endp <= &obuf->data[0] + data_size);
data_size = obuf->ext_endp - obuf->extp;
/*
* Signal encoded; now verify that the connection still exists,
* and if so enqueue the signal and schedule it for send.
*/
obuf->next = NULL;
erts_smp_de_rlock(dep);
cid = dep->cid;
if (cid != dsdp->cid
|| dep->connection_id != dsdp->connection_id
|| dep->status & ERTS_DE_SFLG_EXITING) {
/* Not the same connection as when we started; drop message... */
erts_smp_de_runlock(dep);
free_dist_obuf(obuf);
}
else {
ErtsProcList *plp = NULL;
erts_smp_spin_lock(&dep->qlock);
dep->qsize += size_obuf(obuf);
if (dep->qsize >= erts_dist_buf_busy_limit)
dep->qflgs |= ERTS_DE_QFLG_BUSY;
if (!force_busy && (dep->qflgs & ERTS_DE_QFLG_BUSY)) {
erts_smp_spin_unlock(&dep->qlock);
plp = erts_proclist_create(c_p);
plp->next = NULL;
erts_suspend(c_p, ERTS_PROC_LOCK_MAIN, NULL);
suspended = 1;
erts_smp_spin_lock(&dep->qlock);
}
/* Enqueue obuf on dist entry */
if (dep->out_queue.last)
dep->out_queue.last->next = obuf;
else
dep->out_queue.first = obuf;
dep->out_queue.last = obuf;
if (!force_busy) {
if (!(dep->qflgs & ERTS_DE_QFLG_BUSY)) {
if (suspended)
resume = 1; /* was busy when we started, but isn't now */
}
else {
/* Enqueue suspended process on dist entry */
ASSERT(plp);
if (dep->suspended.last)
dep->suspended.last->next = plp;
else
dep->suspended.first = plp;
dep->suspended.last = plp;
}
}
erts_smp_spin_unlock(&dep->qlock);
erts_schedule_dist_command(NULL, dep);
erts_smp_de_runlock(dep);
if (resume) {
erts_resume(c_p, ERTS_PROC_LOCK_MAIN);
erts_proclist_destroy(plp);
/*
* Note that the calling process still have to yield as if it
* suspended. If not, the calling process could later be
* erroneously scheduled when it shouldn't be.
*/
}
}
if (c_p) {
int reds;
/*
* Bump reductions on calling process.
*
* This is the reduction cost: Always a base cost of 8 reductions
* plus 16 reductions per kilobyte generated external data.
*/
data_size >>= (10-4);
#if defined(ARCH_64) && !HALFWORD_HEAP
data_size &= 0x003fffffffffffff;
#elif defined(ARCH_32) || HALFWORD_HEAP
data_size &= 0x003fffff;
#else
# error "Ohh come on ... !?!"
#endif
reds = 8 + ((int) data_size > 1000000 ? 1000000 : (int) data_size);
BUMP_REDS(c_p, reds);
}
if (suspended) {
if (!resume && erts_system_monitor_flags.busy_dist_port)
monitor_generic(c_p, am_busy_dist_port, cid);
return ERTS_DSIG_SEND_YIELD;
}
return ERTS_DSIG_SEND_OK;
}
static Uint
dist_port_command(Port *prt, ErtsDistOutputBuf *obuf)
{
int fpe_was_unmasked;
Uint size = obuf->ext_endp - obuf->extp;
ERTS_SMP_CHK_NO_PROC_LOCKS;
ERTS_SMP_LC_ASSERT(erts_lc_is_port_locked(prt));
if (size > (Uint) INT_MAX)
erl_exit(ERTS_ABORT_EXIT,
"Absurdly large distribution output data buffer "
"(%bpu bytes) passed.\n",
size);
prt->caller = NIL;
fpe_was_unmasked = erts_block_fpe();
(*prt->drv_ptr->output)((ErlDrvData) prt->drv_data,
(char*) obuf->extp,
(int) size);
erts_unblock_fpe(fpe_was_unmasked);
return size;
}
static Uint
dist_port_commandv(Port *prt, ErtsDistOutputBuf *obuf)
{
int fpe_was_unmasked;
Uint size = obuf->ext_endp - obuf->extp;
SysIOVec iov[2];
ErlDrvBinary* bv[2];
ErlIOVec eiov;
ERTS_SMP_CHK_NO_PROC_LOCKS;
ERTS_SMP_LC_ASSERT(erts_lc_is_port_locked(prt));
if (size > (Uint) INT_MAX)
erl_exit(ERTS_ABORT_EXIT,
"Absurdly large distribution output data buffer "
"(%bpu bytes) passed.\n",
size);
iov[0].iov_base = NULL;
iov[0].iov_len = 0;
bv[0] = NULL;
iov[1].iov_base = obuf->extp;
iov[1].iov_len = size;
bv[1] = Binary2ErlDrvBinary(ErtsDistOutputBuf2Binary(obuf));
eiov.vsize = 2;
eiov.size = size;
eiov.iov = iov;
eiov.binv = bv;
ASSERT(prt->drv_ptr->outputv);
prt->caller = NIL;
fpe_was_unmasked = erts_block_fpe();
(*prt->drv_ptr->outputv)((ErlDrvData) prt->drv_data, &eiov);
erts_unblock_fpe(fpe_was_unmasked);
return size;
}
#if defined(ARCH_64) && !HALFWORD_HEAP
#define ERTS_PORT_REDS_MASK__ 0x003fffffffffffffL
#elif defined(ARCH_32) || HALFWORD_HEAP
#define ERTS_PORT_REDS_MASK__ 0x003fffff
#else
# error "Ohh come on ... !?!"
#endif
#define ERTS_PORT_REDS_DIST_CMD_START 5
#define ERTS_PORT_REDS_DIST_CMD_FINALIZE 3
#define ERTS_PORT_REDS_DIST_CMD_EXIT 200
#define ERTS_PORT_REDS_DIST_CMD_RESUMED 5
#define ERTS_PORT_REDS_DIST_CMD_DATA(SZ) \
((SZ) < (1 << 10) \
? ((Sint) 1) \
: ((((Sint) (SZ)) >> 10) & ((Sint) ERTS_PORT_REDS_MASK__)))
int
erts_dist_command(Port *prt, int reds_limit)
{
Sint reds = ERTS_PORT_REDS_DIST_CMD_START;
int prt_busy;
int de_busy;
Uint32 status;
Uint32 flags;
Uint32 qflgs;
Sint obufsize = 0;
ErtsDistOutputQueue oq, foq;
DistEntry *dep = prt->dist_entry;
Uint (*send)(Port *prt, ErtsDistOutputBuf *obuf);
ERTS_SMP_LC_ASSERT(erts_lc_is_port_locked(prt));
erts_refc_inc(&dep->refc, 1); /* Otherwise dist_entry might be
removed if port command fails */
erts_smp_atomic_xchg(&dep->dist_cmd_scheduled, 0);
erts_smp_de_rlock(dep);
flags = dep->flags;
status = dep->status;
send = dep->send;
erts_smp_de_runlock(dep);
if (status & ERTS_DE_SFLG_EXITING) {
erts_do_exit_port(prt, prt->id, am_killed);
erts_deref_dist_entry(dep);
return reds + ERTS_PORT_REDS_DIST_CMD_EXIT;
}
ASSERT(send);
/*
* We need to remove both out queues from the
* dist entry while passing it to port command;
* otherwise, port command will free the buffers
* in the queues on failure and we'll end up with
* a mess.
*/
erts_smp_spin_lock(&dep->qlock);
oq.first = dep->out_queue.first;
oq.last = dep->out_queue.last;
dep->out_queue.first = NULL;
dep->out_queue.last = NULL;
qflgs = dep->qflgs;
erts_smp_spin_unlock(&dep->qlock);
foq.first = dep->finalized_out_queue.first;
foq.last = dep->finalized_out_queue.last;
dep->finalized_out_queue.first = NULL;
dep->finalized_out_queue.last = NULL;
if (reds > reds_limit)
goto preempted;
prt_busy = (int) (prt->status & ERTS_PORT_SFLG_PORT_BUSY);
de_busy = (int) (qflgs & ERTS_DE_QFLG_BUSY);
if (prt_busy) {
if (!de_busy) {
erts_smp_spin_lock(&dep->qlock);
dep->qflgs |= ERTS_DE_QFLG_BUSY;
erts_smp_spin_unlock(&dep->qlock);
de_busy = 1;
}
}
else if (foq.first) {
int preempt = 0;
do {
Uint size;
ErtsDistOutputBuf *fob;
size = (*send)(prt, foq.first);
#ifdef ERTS_RAW_DIST_MSG_DBG
erts_fprintf(stderr, ">> ");
bw(foq.first->extp, size);
#endif
reds += ERTS_PORT_REDS_DIST_CMD_DATA(size);
fob = foq.first;
obufsize += size_obuf(fob);
foq.first = foq.first->next;
free_dist_obuf(fob);
preempt = reds > reds_limit || (prt->status & ERTS_PORT_SFLGS_DEAD);
if (prt->status & ERTS_PORT_SFLG_PORT_BUSY) {
erts_smp_spin_lock(&dep->qlock);
dep->qflgs |= ERTS_DE_QFLG_BUSY;
erts_smp_spin_unlock(&dep->qlock);
de_busy = prt_busy = 1;
break;
}
} while (foq.first && !preempt);
if (!foq.first)
foq.last = NULL;
if (preempt)
goto preempted;
}
if (prt_busy) {
if (oq.first) {
ErtsDistOutputBuf *ob;
int preempt;
finalize_only:
preempt = 0;
ob = oq.first;
ASSERT(ob);
do {
ob->extp = erts_encode_ext_dist_header_finalize(ob->extp,
dep->cache);
if (!(flags & DFLAG_DIST_HDR_ATOM_CACHE))
*--ob->extp = PASS_THROUGH; /* Old node; 'pass through'
needed */
ASSERT(&ob->data[0] <= ob->extp && ob->extp < ob->ext_endp);
reds += ERTS_PORT_REDS_DIST_CMD_FINALIZE;
preempt = reds > reds_limit;
if (preempt)
break;
ob = ob->next;
} while (ob);
/*
* At least one buffer was finalized; if we got preempted,
* ob points to the last buffer that we finalized.
*/
if (foq.last)
foq.last->next = oq.first;
else
foq.first = oq.first;
if (!preempt) {
/* All buffers finalized */
foq.last = oq.last;
oq.first = oq.last = NULL;
}
else {
/* Not all buffers finalized; split oq. */
foq.last = ob;
oq.first = ob->next;
if (oq.first)
ob->next = NULL;
else
oq.last = NULL;
}
if (preempt)
goto preempted;
}
}
else {
int preempt = 0;
while (oq.first && !preempt) {
ErtsDistOutputBuf *fob;
Uint size;
oq.first->extp
= erts_encode_ext_dist_header_finalize(oq.first->extp,
dep->cache);
reds += ERTS_PORT_REDS_DIST_CMD_FINALIZE;
if (!(flags & DFLAG_DIST_HDR_ATOM_CACHE))
*--oq.first->extp = PASS_THROUGH; /* Old node; 'pass through'
needed */
ASSERT(&oq.first->data[0] <= oq.first->extp
&& oq.first->extp < oq.first->ext_endp);
size = (*send)(prt, oq.first);
#ifdef ERTS_RAW_DIST_MSG_DBG
erts_fprintf(stderr, ">> ");
bw(oq.first->extp, size);
#endif
reds += ERTS_PORT_REDS_DIST_CMD_DATA(size);
fob = oq.first;
obufsize += size_obuf(fob);
oq.first = oq.first->next;
free_dist_obuf(fob);
preempt = reds > reds_limit || (prt->status & ERTS_PORT_SFLGS_DEAD);
if (prt->status & ERTS_PORT_SFLG_PORT_BUSY) {
erts_smp_spin_lock(&dep->qlock);
dep->qflgs |= ERTS_DE_QFLG_BUSY;
erts_smp_spin_unlock(&dep->qlock);
de_busy = prt_busy = 1;
if (oq.first && !preempt)
goto finalize_only;
}
}
ASSERT(!oq.first || preempt);
/*
* Preempt if not all buffers have been handled.
*/
if (preempt && oq.first)
goto preempted;
#ifdef DEBUG
oq.last = NULL;
#endif
ASSERT(!oq.first);
ASSERT(!foq.first && !foq.last);
/*
* Everything that was buffered when we started have now been
* written to the port. If port isn't busy but dist entry is
* and we havn't got too muched queued on dist entry, set
* dist entry in a non-busy state and resume suspended
* processes.
*/
erts_smp_spin_lock(&dep->qlock);
ASSERT(dep->qsize >= obufsize);
dep->qsize -= obufsize;
obufsize = 0;
if (de_busy && !prt_busy && dep->qsize < erts_dist_buf_busy_limit) {
ErtsProcList *suspendees;
int resumed;
suspendees = get_suspended_on_de(dep, ERTS_DE_QFLG_BUSY);
erts_smp_spin_unlock(&dep->qlock);
resumed = erts_resume_processes(suspendees);
reds += resumed*ERTS_PORT_REDS_DIST_CMD_RESUMED;
de_busy = 0;
}
else
erts_smp_spin_unlock(&dep->qlock);
}
ASSERT(!oq.first && !oq.last);
done:
if (obufsize != 0) {
ASSERT(obufsize > 0);
erts_smp_spin_lock(&dep->qlock);
ASSERT(dep->qsize >= obufsize);
dep->qsize -= obufsize;
erts_smp_spin_unlock(&dep->qlock);
}
ASSERT(foq.first || !foq.last);
ASSERT(!foq.first || foq.last);
ASSERT(!dep->finalized_out_queue.first);
ASSERT(!dep->finalized_out_queue.last);
if (foq.first) {
dep->finalized_out_queue.first = foq.first;
dep->finalized_out_queue.last = foq.last;
}
/* Avoid wrapping reduction counter... */
if (reds > INT_MAX/2)
reds = INT_MAX/2;
erts_deref_dist_entry(dep);
return reds;
preempted:
ASSERT(oq.first || !oq.last);
ASSERT(!oq.first || oq.last);
if (prt->status & ERTS_PORT_SFLGS_DEAD) {
/*
* Port died during port command; clean up 'oq'
* and 'foq'. Things buffered in dist entry after
* we begun processing the queues have already been
* cleaned up when port terminated.
*/
if (oq.first)
oq.last->next = foq.first;
else
oq.first = foq.first;
while (oq.first) {
ErtsDistOutputBuf *fob = oq.first;
oq.first = oq.first->next;
obufsize += size_obuf(fob);
free_dist_obuf(fob);
}
foq.first = NULL;
foq.last = NULL;
#ifdef DEBUG
erts_smp_spin_lock(&dep->qlock);
ASSERT(dep->qsize == obufsize);
erts_smp_spin_unlock(&dep->qlock);
#endif
}
else {
if (oq.first) {
/*
* Unhandle buffers need to be put back first
* in out_queue.
*/
erts_smp_spin_lock(&dep->qlock);
dep->qsize -= obufsize;
obufsize = 0;
oq.last->next = dep->out_queue.first;
dep->out_queue.first = oq.first;
if (!dep->out_queue.last)
dep->out_queue.last = oq.last;
erts_smp_spin_unlock(&dep->qlock);
}
erts_schedule_dist_command(prt, NULL);
}
goto done;
}
void
erts_dist_port_not_busy(Port *prt)
{
erts_schedule_dist_command(prt, NULL);
}
void
erts_kill_dist_connection(DistEntry *dep, Uint32 connection_id)
{
erts_smp_de_rwlock(dep);
if (is_internal_port(dep->cid)
&& connection_id == dep->connection_id
&& !(dep->status & ERTS_DE_SFLG_EXITING)) {
dep->status |= ERTS_DE_SFLG_EXITING;
erts_smp_spin_lock(&dep->qlock);
ASSERT(!(dep->qflgs & ERTS_DE_QFLG_EXIT));
dep->qflgs |= ERTS_DE_QFLG_EXIT;
erts_smp_spin_unlock(&dep->qlock);
erts_schedule_dist_command(NULL, dep);
}
erts_smp_de_rwunlock(dep);
}
struct print_to_data {
int to;
void *arg;
};
static void doit_print_monitor_info(ErtsMonitor *mon, void *vptdp)
{
int to = ((struct print_to_data *) vptdp)->to;
void *arg = ((struct print_to_data *) vptdp)->arg;
Process *rp;
ErtsMonitor *rmon;
rp = erts_pid2proc_unlocked(mon->pid);
if (!rp || (rmon = erts_lookup_monitor(rp->monitors, mon->ref)) == NULL) {
erts_print(to, arg, "Warning, stray monitor for: %T\n", mon->pid);
} else if (mon->type == MON_ORIGIN) {
/* Local pid is being monitored */
erts_print(to, arg, "Remotely monitored by: %T %T\n",
mon->pid, rmon->pid);
} else {
erts_print(to, arg, "Remote monitoring: %T ", mon->pid);
if (is_not_atom(rmon->pid))
erts_print(to, arg, "%T\n", rmon->pid);
else
erts_print(to, arg, "{%T, %T}\n",
rmon->name,
rmon->pid); /* which in this case is the
remote system name... */
}
}
static void print_monitor_info(int to, void *arg, ErtsMonitor *mon)
{
struct print_to_data ptd = {to, arg};
erts_doforall_monitors(mon,&doit_print_monitor_info,&ptd);
}
typedef struct {
struct print_to_data *ptdp;
Eterm from;
} PrintLinkContext;
static void doit_print_link_info2(ErtsLink *lnk, void *vpplc)
{
PrintLinkContext *pplc = (PrintLinkContext *) vpplc;
erts_print(pplc->ptdp->to, pplc->ptdp->arg, "Remote link: %T %T\n",
pplc->from, lnk->pid);
}
static void doit_print_link_info(ErtsLink *lnk, void *vptdp)
{
if (is_internal_pid(lnk->pid) && erts_pid2proc_unlocked(lnk->pid)) {
PrintLinkContext plc = {(struct print_to_data *) vptdp, lnk->pid};
erts_doforall_links(ERTS_LINK_ROOT(lnk), &doit_print_link_info2, &plc);
}
}
static void print_link_info(int to, void *arg, ErtsLink *lnk)
{
struct print_to_data ptd = {to, arg};
erts_doforall_links(lnk, &doit_print_link_info, (void *) &ptd);
}
typedef struct {
struct print_to_data ptd;
Eterm sysname;
} PrintNodeLinkContext;
static void doit_print_nodelink_info(ErtsLink *lnk, void *vpcontext)
{
PrintNodeLinkContext *pcontext = vpcontext;
if (is_internal_pid(lnk->pid) && erts_pid2proc_unlocked(lnk->pid))
erts_print(pcontext->ptd.to, pcontext->ptd.arg,
"Remote monitoring: %T %T\n", lnk->pid, pcontext->sysname);
}
static void print_nodelink_info(int to, void *arg, ErtsLink *lnk, Eterm sysname)
{
PrintNodeLinkContext context = {{to, arg}, sysname};
erts_doforall_links(lnk, &doit_print_nodelink_info, &context);
}
static int
info_dist_entry(int to, void *arg, DistEntry *dep, int visible, int connected)
{
if (visible && connected) {
erts_print(to, arg, "=visible_node:");
} else if (connected) {
erts_print(to, arg, "=hidden_node:");
} else {
erts_print(to, arg, "=not_connected:");
}
erts_print(to, arg, "%d\n", dist_entry_channel_no(dep));
if(connected && is_nil(dep->cid)) {
erts_print(to, arg,
"Error: Not connected node still registered as connected:%T\n",
dep->sysname);
return 0;
}
if(!connected && is_not_nil(dep->cid)) {
erts_print(to, arg,
"Error: Connected node not registered as connected:%T\n",
dep->sysname);
return 0;
}
erts_print(to, arg, "Name: %T", dep->sysname);
#ifdef DEBUG
erts_print(to, arg, " (refc=%d)", erts_refc_read(&dep->refc, 1));
#endif
erts_print(to, arg, "\n");
if (!connected && is_nil(dep->cid)) {
if (dep->nlinks) {
erts_print(to, arg, "Error: Got links to not connected node:%T\n",
dep->sysname);
}
return 0;
}
erts_print(to, arg, "Controller: %T\n", dep->cid, to);
erts_print_node_info(to, arg, dep->sysname, NULL, NULL);
print_monitor_info(to, arg, dep->monitors);
print_link_info(to, arg, dep->nlinks);
print_nodelink_info(to, arg, dep->node_links, dep->sysname);
return 0;
}
int distribution_info(int to, void *arg) /* Called by break handler */
{
DistEntry *dep;
erts_print(to, arg, "=node:%T\n", erts_this_dist_entry->sysname);
if (erts_this_node->sysname == am_Noname) {
erts_print(to, arg, "=no_distribution\n");
return(0);
}
#if 0
if (!erts_visible_dist_entries && !erts_hidden_dist_entries)
erts_print(to, arg, "Alive but not holding any connections \n");
#endif
for(dep = erts_visible_dist_entries; dep; dep = dep->next) {
info_dist_entry(to, arg, dep, 1, 1);
}
for(dep = erts_hidden_dist_entries; dep; dep = dep->next) {
info_dist_entry(to, arg, dep, 0, 1);
}
for (dep = erts_not_connected_dist_entries; dep; dep = dep->next) {
info_dist_entry(to, arg, dep, 0, 0);
}
return(0);
}
/****************************************************************************
DISTRIBUTION BIFS:
setnode/2 -- start distribution
setnode/3 -- set node controller
node/1 -- return objects node name
node/0 -- return this node name
nodes/0 -- return a list of all (non hidden) nodes
is_alive -- return true if distribution is running else false
monitor_node -- turn on/off node monitoring
node controller only:
dist_exit/3 -- send exit signals from remote to local process
dist_link/2 -- link a remote process to a local
dist_unlink/2 -- unlink a remote from a local
****************************************************************************/
/**********************************************************************
** Set the node name of current node fail if node already is set.
** setnode(name@host, Creation)
** loads functions pointer to trap_functions from module erlang.
** erlang:dsend/2
** erlang:dlink/1
** erlang:dunlink/1
** erlang:dmonitor_node/3
** erlang:dgroup_leader/2
** erlang:dexit/2
** -- are these needed ?
** dexit/1
***********************************************************************/
BIF_RETTYPE setnode_2(BIF_ALIST_2)
{
Process *net_kernel;
Uint creation;
/* valid creation ? */
if(!term_to_Uint(BIF_ARG_2, &creation))
goto error;
if(creation > 3)
goto error;
/* valid node name ? */
if (!is_node_name_atom(BIF_ARG_1))
goto error;
if (BIF_ARG_1 == am_Noname) /* cant use this name !! */
goto error;
if (erts_is_alive) /* must not be alive! */
goto error;
/* Check that all trap functions are defined !! */
if (dsend2_trap->address == NULL ||
dsend3_trap->address == NULL ||
/* dsend_nosuspend_trap->address == NULL ||*/
dlink_trap->address == NULL ||
dunlink_trap->address == NULL ||
dmonitor_node_trap->address == NULL ||
dgroup_leader_trap->address == NULL ||
dmonitor_p_trap->address == NULL ||
dexit_trap->address == NULL) {
goto error;
}
net_kernel = erts_whereis_process(BIF_P, ERTS_PROC_LOCK_MAIN,
am_net_kernel, ERTS_PROC_LOCK_MAIN, 0);
if (!net_kernel)
goto error;
/* By setting dist_entry==erts_this_dist_entry and DISTRIBUTION on
net_kernel do_net_exist will be called when net_kernel
is terminated !! */
(void *) ERTS_PROC_SET_DIST_ENTRY(net_kernel,
ERTS_PROC_LOCK_MAIN,
erts_this_dist_entry);
erts_refc_inc(&erts_this_dist_entry->refc, 2);
net_kernel->flags |= F_DISTRIBUTION;
if (net_kernel != BIF_P)
erts_smp_proc_unlock(net_kernel, ERTS_PROC_LOCK_MAIN);
#ifdef DEBUG
erts_smp_rwmtx_rwlock(&erts_dist_table_rwmtx);
ASSERT(!erts_visible_dist_entries && !erts_hidden_dist_entries);
erts_smp_rwmtx_rwunlock(&erts_dist_table_rwmtx);
#endif
erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
erts_smp_block_system(ERTS_BS_FLG_ALLOW_GC);
erts_set_this_node(BIF_ARG_1, (Uint32) creation);
erts_is_alive = 1;
send_nodes_mon_msgs(NULL, am_nodeup, BIF_ARG_1, am_visible, NIL);
erts_smp_release_system();
erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
BIF_RET(am_true);
error:
BIF_ERROR(BIF_P, BADARG);
}
/**********************************************************************
** Allocate a dist entry, set node name install the connection handler
** setnode_3({name@host, Creation}, Cid, {Type, Version, Initial, IC, OC})
** Type = flag field, where the flags are specified in dist.h
** Version = distribution version, >= 1
** IC = in_cookie (ignored)
** OC = out_cookie (ignored)
**
** Note that in distribution protocols above 1, the Initial parameter
** is always NIL and the cookies are always the atom '', cookies are not
** sent in the distribution messages but are only used in
** the handshake.
**
***********************************************************************/
BIF_RETTYPE setnode_3(BIF_ALIST_3)
{
BIF_RETTYPE ret;
Uint flags;
unsigned long version;
Eterm ic, oc;
Eterm *tp;
DistEntry *dep = NULL;
Port *pp = NULL;
/* Prepare for success */
ERTS_BIF_PREP_RET(ret, am_true);
/*
* Check and pick out arguments
*/
if (!is_node_name_atom(BIF_ARG_1) ||
is_not_internal_port(BIF_ARG_2) ||
(erts_this_node->sysname == am_Noname)) {
goto badarg;
}
if (!is_tuple(BIF_ARG_3))
goto badarg;
tp = tuple_val(BIF_ARG_3);
if (*tp++ != make_arityval(4))
goto badarg;
if (!is_small(*tp))
goto badarg;
flags = unsigned_val(*tp++);
if (!is_small(*tp) || (version = unsigned_val(*tp)) == 0)
goto badarg;
ic = *(++tp);
oc = *(++tp);
if (!is_atom(ic) || !is_atom(oc))
goto badarg;
/* DFLAG_EXTENDED_REFERENCES is compulsory from R9 and forward */
if (!(DFLAG_EXTENDED_REFERENCES & flags)) {
erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf();
erts_dsprintf(dsbufp, "%T", BIF_P->id);
if (BIF_P->reg)
erts_dsprintf(dsbufp, " (%T)", BIF_P->reg->name);
erts_dsprintf(dsbufp,
" attempted to enable connection to node %T "
"which is not able to handle extended references.\n",
BIF_ARG_1);
erts_send_error_to_logger(BIF_P->group_leader, dsbufp);
goto badarg;
}
/*
* Arguments seem to be in order.
*/
/* get dist_entry */
dep = erts_find_or_insert_dist_entry(BIF_ARG_1);
if (dep == erts_this_dist_entry)
goto badarg;
else if (!dep)
goto system_limit; /* Should never happen!!! */
pp = erts_id2port(BIF_ARG_2, BIF_P, ERTS_PROC_LOCK_MAIN);
erts_smp_de_rwlock(dep);
if (!pp || (pp->status & ERTS_PORT_SFLG_EXITING))
goto badarg;
if ((pp->drv_ptr->flags & ERL_DRV_FLAG_SOFT_BUSY) == 0)
goto badarg;
if (dep->cid == BIF_ARG_2 && pp->dist_entry == dep)
goto done; /* Already set */
if (dep->status & ERTS_DE_SFLG_EXITING) {
/* Suspend on dist entry waiting for the exit to finish */
ErtsProcList *plp = erts_proclist_create(BIF_P);
plp->next = NULL;
erts_suspend(BIF_P, ERTS_PROC_LOCK_MAIN, NULL);
erts_smp_spin_lock(&dep->qlock);
if (dep->suspended.last)
dep->suspended.last->next = plp;
else
dep->suspended.first = plp;
dep->suspended.last = plp;
erts_smp_spin_unlock(&dep->qlock);
goto yield;
}
ASSERT(!(dep->status & ERTS_DE_SFLG_EXITING));
if (pp->dist_entry || is_not_nil(dep->cid))
goto badarg;
erts_port_status_bor_set(pp, ERTS_PORT_SFLG_DISTRIBUTION);
pp->dist_entry = dep;
dep->version = version;
dep->creation = 0;
ASSERT(pp->drv_ptr->outputv || pp->drv_ptr->output);
#if 1
dep->send = (pp->drv_ptr->outputv
? dist_port_commandv
: dist_port_command);
#else
dep->send = dist_port_command;
#endif
ASSERT(dep->send);
#ifdef DEBUG
erts_smp_spin_lock(&dep->qlock);
ASSERT(dep->qsize == 0);
erts_smp_spin_unlock(&dep->qlock);
#endif
erts_set_dist_entry_connected(dep, BIF_ARG_2, flags);
if (flags & DFLAG_DIST_HDR_ATOM_CACHE)
create_cache(dep);
erts_smp_de_rwunlock(dep);
dep = NULL; /* inc of refc transferred to port (dist_entry field) */
send_nodes_mon_msgs(BIF_P,
am_nodeup,
BIF_ARG_1,
flags & DFLAG_PUBLISHED ? am_visible : am_hidden,
NIL);
done:
if (dep && dep != erts_this_dist_entry) {
erts_smp_de_rwunlock(dep);
erts_deref_dist_entry(dep);
}
if (pp)
erts_smp_port_unlock(pp);
return ret;
yield:
ERTS_BIF_PREP_YIELD3(ret, bif_export[BIF_setnode_3], BIF_P,
BIF_ARG_1, BIF_ARG_2, BIF_ARG_3);
goto done;
badarg:
ERTS_BIF_PREP_ERROR(ret, BIF_P, BADARG);
goto done;
system_limit:
ERTS_BIF_PREP_ERROR(ret, BIF_P, SYSTEM_LIMIT);
goto done;
}
/**********************************************************************/
/* dist_exit(Local, Term, Remote) -> Bool */
BIF_RETTYPE dist_exit_3(BIF_ALIST_3)
{
Eterm local;
Eterm remote;
DistEntry *rdep;
local = BIF_ARG_1;
remote = BIF_ARG_3;
/* Check that remote is a remote process */
if (is_not_external_pid(remote))
goto error;
rdep = external_dist_entry(remote);
if(rdep == erts_this_dist_entry)
goto error;
/* Check that local is local */
if (is_internal_pid(local)) {
Process *lp;
ErtsProcLocks lp_locks;
if (BIF_P->id == local) {
lp_locks = ERTS_PROC_LOCKS_ALL;
lp = BIF_P;
erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCKS_ALL_MINOR);
}
else {
lp_locks = ERTS_PROC_LOCKS_XSIG_SEND;
lp = erts_pid2proc_opt(BIF_P, ERTS_PROC_LOCK_MAIN,
local, lp_locks,
ERTS_P2P_FLG_SMP_INC_REFC);
if (!lp) {
BIF_RET(am_true); /* ignore */
}
}
(void) erts_send_exit_signal(BIF_P,
remote,
lp,
&lp_locks,
BIF_ARG_2,
NIL,
NULL,
0);
#ifdef ERTS_SMP
if (lp == BIF_P)
lp_locks &= ~ERTS_PROC_LOCK_MAIN;
#endif
erts_smp_proc_unlock(lp, lp_locks);
if (lp != BIF_P)
erts_smp_proc_dec_refc(lp);
else {
/*
* We may have exited current process and may have to take action.
*/
ERTS_BIF_CHK_EXITED(BIF_P);
ERTS_SMP_BIF_CHK_PENDING_EXIT(BIF_P, ERTS_PROC_LOCK_MAIN);
}
}
else if (is_external_pid(local)
&& external_dist_entry(local) == erts_this_dist_entry) {
BIF_RET(am_true); /* ignore */
}
else
goto error;
BIF_RET(am_true);
error:
BIF_ERROR(BIF_P, BADARG);
}
/**********************************************************************/
/* node(Object) -> Node */
BIF_RETTYPE node_1(BIF_ALIST_1)
{
if (is_not_node_container(BIF_ARG_1))
BIF_ERROR(BIF_P, BADARG);
BIF_RET(node_container_node_name(BIF_ARG_1));
}
/**********************************************************************/
/* node() -> Node */
BIF_RETTYPE node_0(BIF_ALIST_0)
{
BIF_RET(erts_this_dist_entry->sysname);
}
/**********************************************************************/
/* nodes() -> [ Node ] */
#if 0 /* Done in erlang.erl instead. */
BIF_RETTYPE nodes_0(BIF_ALIST_0)
{
return nodes_1(BIF_P, am_visible);
}
#endif
BIF_RETTYPE nodes_1(BIF_ALIST_1)
{
Eterm result;
int length;
Eterm* hp;
int not_connected = 0;
int visible = 0;
int hidden = 0;
int this = 0;
DeclareTmpHeap(buf,2,BIF_P); /* For one cons-cell */
DistEntry *dep;
Eterm arg_list = BIF_ARG_1;
#ifdef DEBUG
Eterm* endp;
#endif
UseTmpHeap(2,BIF_P);
if (is_atom(BIF_ARG_1))
arg_list = CONS(buf, BIF_ARG_1, NIL);
while (is_list(arg_list)) {
switch(CAR(list_val(arg_list))) {
case am_visible: visible = 1; break;
case am_hidden: hidden = 1; break;
case am_known: visible = hidden = not_connected = this = 1; break;
case am_this: this = 1; break;
case am_connected: visible = hidden = 1; break;
default: goto error; break;
}
arg_list = CDR(list_val(arg_list));
}
if (is_not_nil(arg_list)) {
goto error;
}
length = 0;
erts_smp_rwmtx_rwlock(&erts_dist_table_rwmtx);
ASSERT(erts_no_of_not_connected_dist_entries >= 0);
ASSERT(erts_no_of_hidden_dist_entries >= 0);
ASSERT(erts_no_of_visible_dist_entries >= 0);
if(not_connected)
length += erts_no_of_not_connected_dist_entries;
if(hidden)
length += erts_no_of_hidden_dist_entries;
if(visible)
length += erts_no_of_visible_dist_entries;
if(this)
length++;
result = NIL;
if (length == 0) {
erts_smp_rwmtx_rwunlock(&erts_dist_table_rwmtx);
goto done;
}
hp = HAlloc(BIF_P, 2*length);
#ifdef DEBUG
endp = hp + length*2;
#endif
if(not_connected)
for(dep = erts_not_connected_dist_entries; dep; dep = dep->next) {
result = CONS(hp, dep->sysname, result);
hp += 2;
}
if(hidden)
for(dep = erts_hidden_dist_entries; dep; dep = dep->next) {
result = CONS(hp, dep->sysname, result);
hp += 2;
}
if(visible)
for(dep = erts_visible_dist_entries; dep; dep = dep->next) {
result = CONS(hp, dep->sysname, result);
hp += 2;
}
if(this) {
result = CONS(hp, erts_this_dist_entry->sysname, result);
hp += 2;
}
ASSERT(endp == hp);
erts_smp_rwmtx_rwunlock(&erts_dist_table_rwmtx);
done:
UnUseTmpHeap(2,BIF_P);
BIF_RET(result);
error:
UnUseTmpHeap(2,BIF_P);
BIF_ERROR(BIF_P,BADARG);
}
/**********************************************************************/
/* is_alive() -> Bool */
BIF_RETTYPE is_alive_0(BIF_ALIST_0)
{
Eterm res = erts_is_alive ? am_true : am_false;
BIF_RET(res);
}
/**********************************************************************/
/* erlang:monitor_node(Node, Bool, Options) -> Bool */
BIF_RETTYPE monitor_node_3(BIF_ALIST_3)
{
DistEntry *dep;
ErtsLink *lnk;
Eterm l;
for (l = BIF_ARG_3; l != NIL && is_list(l); l = CDR(list_val(l))) {
Eterm t = CAR(list_val(l));
/* allow_passive_connect the only available option right now */
if (t != am_allow_passive_connect) {
BIF_ERROR(BIF_P, BADARG);
}
}
if (l != NIL) {
BIF_ERROR(BIF_P, BADARG);
}
if (is_not_atom(BIF_ARG_1) ||
((BIF_ARG_2 != am_true) && (BIF_ARG_2 != am_false)) ||
((erts_this_node->sysname == am_Noname)
&& (BIF_ARG_1 != erts_this_node->sysname))) {
BIF_ERROR(BIF_P, BADARG);
}
dep = erts_sysname_to_connected_dist_entry(BIF_ARG_1);
if (!dep) {
do_trap:
BIF_TRAP3(dmonitor_node_trap, BIF_P, BIF_ARG_1, BIF_ARG_2, BIF_ARG_3);
}
if (dep == erts_this_dist_entry)
goto done;
erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_LINK);
erts_smp_de_rlock(dep);
if (ERTS_DE_IS_NOT_CONNECTED(dep)) {
erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK);
erts_smp_de_runlock(dep);
goto do_trap;
}
erts_smp_de_links_lock(dep);
erts_smp_de_runlock(dep);
if (BIF_ARG_2 == am_true) {
ASSERT(dep->cid != NIL);
lnk = erts_add_or_lookup_link(&(dep->node_links), LINK_NODE,
BIF_P->id);
++ERTS_LINK_REFC(lnk);
lnk = erts_add_or_lookup_link(&(BIF_P->nlinks), LINK_NODE, BIF_ARG_1);
++ERTS_LINK_REFC(lnk);
}
else {
lnk = erts_lookup_link(dep->node_links, BIF_P->id);
if (lnk != NULL) {
if ((--ERTS_LINK_REFC(lnk)) == 0) {
erts_destroy_link(erts_remove_link(&(dep->node_links),
BIF_P->id));
}
}
lnk = erts_lookup_link(BIF_P->nlinks, BIF_ARG_1);
if (lnk != NULL) {
if ((--ERTS_LINK_REFC(lnk)) == 0) {
erts_destroy_link(erts_remove_link(&(BIF_P->nlinks),
BIF_ARG_1));
}
}
}
erts_smp_de_links_unlock(dep);
erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK);
done:
erts_deref_dist_entry(dep);
BIF_RET(am_true);
}
/* monitor_node(Node, Bool) -> Bool */
BIF_RETTYPE monitor_node_2(BIF_ALIST_2)
{
BIF_RET(monitor_node_3(BIF_P,BIF_ARG_1,BIF_ARG_2,NIL));
}
BIF_RETTYPE net_kernel_dflag_unicode_io_1(BIF_ALIST_1)
{
DistEntry *de;
Uint32 f;
if (is_not_pid(BIF_ARG_1)) {
BIF_ERROR(BIF_P,BADARG);
}
de = pid_dist_entry(BIF_ARG_1);
ASSERT(de != NULL);
if (de == erts_this_dist_entry) {
BIF_RET(am_true);
}
erts_smp_de_rlock(de);
f = de->flags;
erts_smp_de_runlock(de);
BIF_RET(((f & DFLAG_UNICODE_IO) ? am_true : am_false));
}
/*
* The major part of the implementation of net_kernel:monitor_nodes/[1,2]
* follows.
*
* Currently net_kernel:monitor_nodes/[1,2] calls process_flag/2 which in
* turn calls erts_monitor_nodes(). If the process_flag() call fails (with
* badarg), the code in net_kernel determines what type of error to return.
* This in order to simplify the task of being backward compatible.
*/
#define ERTS_NODES_MON_OPT_TYPE_VISIBLE (((Uint16) 1) << 0)
#define ERTS_NODES_MON_OPT_TYPE_HIDDEN (((Uint16) 1) << 1)
#define ERTS_NODES_MON_OPT_DOWN_REASON (((Uint16) 1) << 2)
#define ERTS_NODES_MON_OPT_TYPES \
(ERTS_NODES_MON_OPT_TYPE_VISIBLE|ERTS_NODES_MON_OPT_TYPE_HIDDEN)
typedef struct ErtsNodesMonitor_ ErtsNodesMonitor;
struct ErtsNodesMonitor_ {
ErtsNodesMonitor *prev;
ErtsNodesMonitor *next;
Process *proc;
Uint16 opts;
Uint16 no;
};
static erts_smp_mtx_t nodes_monitors_mtx;
static ErtsNodesMonitor *nodes_monitors;
static ErtsNodesMonitor *nodes_monitors_end;
/*
* Nodes monitors are stored in a double linked list. 'nodes_monitors'
* points to the beginning of the list and 'nodes_monitors_end' points
* to the end of the list.
*
* There might be more than one entry per process in the list. If so,
* they are located in sequence. The 'nodes_monitors' field of the
* process struct refers to the first element in the sequence
* corresponding to the process in question.
*/
static void
init_nodes_monitors(void)
{
erts_smp_mtx_init(&nodes_monitors_mtx, "nodes_monitors");
nodes_monitors = NULL;
nodes_monitors_end = NULL;
}
static ERTS_INLINE Uint
nodes_mon_msg_sz(ErtsNodesMonitor *nmp, Eterm what, Eterm reason)
{
Uint sz;
if (!nmp->opts) {
sz = 3;
}
else {
sz = 0;
if (nmp->opts & ERTS_NODES_MON_OPT_TYPES)
sz += 2 + 3;
if (what == am_nodedown
&& (nmp->opts & ERTS_NODES_MON_OPT_DOWN_REASON)) {
if (is_not_immed(reason))
sz += size_object(reason);
sz += 2 + 3;
}
sz += 4;
}
return sz;
}
static ERTS_INLINE void
send_nodes_mon_msg(Process *rp,
ErtsProcLocks *rp_locksp,
ErtsNodesMonitor *nmp,
Eterm node,
Eterm what,
Eterm type,
Eterm reason,
Uint sz)
{
Eterm msg;
ErlHeapFragment* bp;
ErlOffHeap *ohp;
Eterm *hp = erts_alloc_message_heap(sz, &bp, &ohp, rp, rp_locksp);
#ifdef DEBUG
Eterm *hend = hp + sz;
#endif
if (!nmp->opts) {
msg = TUPLE2(hp, what, node);
#ifdef DEBUG
hp += 3;
#endif
}
else {
Eterm tup;
Eterm info = NIL;
if (nmp->opts & (ERTS_NODES_MON_OPT_TYPE_VISIBLE
| ERTS_NODES_MON_OPT_TYPE_HIDDEN)) {
tup = TUPLE2(hp, am_node_type, type);
hp += 3;
info = CONS(hp, tup, info);
hp += 2;
}
if (what == am_nodedown
&& (nmp->opts & ERTS_NODES_MON_OPT_DOWN_REASON)) {
Eterm rsn_cpy;
if (is_immed(reason))
rsn_cpy = reason;
else {
Eterm rsn_sz = size_object(reason);
rsn_cpy = copy_struct(reason, rsn_sz, &hp, ohp);
}
tup = TUPLE2(hp, am_nodedown_reason, rsn_cpy);
hp += 3;
info = CONS(hp, tup, info);
hp += 2;
}
msg = TUPLE3(hp, what, node, info);
#ifdef DEBUG
hp += 4;
#endif
}
ASSERT(hend == hp);
erts_queue_message(rp, rp_locksp, bp, msg, NIL);
}
static void
send_nodes_mon_msgs(Process *c_p, Eterm what, Eterm node, Eterm type, Eterm reason)
{
ErtsNodesMonitor *nmp;
ErtsProcLocks rp_locks = 0; /* Init to shut up false warning */
Process *rp = NULL;
ASSERT(is_immed(what));
ASSERT(is_immed(node));
ASSERT(is_immed(type));
ERTS_SMP_LC_ASSERT(!c_p
|| (erts_proc_lc_my_proc_locks(c_p)
== ERTS_PROC_LOCK_MAIN));
erts_smp_mtx_lock(&nodes_monitors_mtx);
for (nmp = nodes_monitors; nmp; nmp = nmp->next) {
int i;
Uint16 no;
Uint sz;
ASSERT(nmp->proc != NULL);
if (!nmp->opts) {
if (type != am_visible)
continue;
}
else {
switch (type) {
case am_hidden:
if (!(nmp->opts & ERTS_NODES_MON_OPT_TYPE_HIDDEN))
continue;
break;
case am_visible:
if ((nmp->opts & ERTS_NODES_MON_OPT_TYPES)
&& !(nmp->opts & ERTS_NODES_MON_OPT_TYPE_VISIBLE))
continue;
break;
default:
erl_exit(ERTS_ABORT_EXIT, "Bad node type found\n");
}
}
if (rp != nmp->proc) {
if (rp) {
if (rp == c_p)
rp_locks &= ~ERTS_PROC_LOCK_MAIN;
erts_smp_proc_unlock(rp, rp_locks);
}
rp = nmp->proc;
rp_locks = 0;
if (rp == c_p)
rp_locks |= ERTS_PROC_LOCK_MAIN;
}
ASSERT(rp);
sz = nodes_mon_msg_sz(nmp, what, reason);
for (i = 0, no = nmp->no; i < no; i++)
send_nodes_mon_msg(rp,
&rp_locks,
nmp,
node,
what,
type,
reason,
sz);
}
if (rp) {
if (rp == c_p)
rp_locks &= ~ERTS_PROC_LOCK_MAIN;
erts_smp_proc_unlock(rp, rp_locks);
}
erts_smp_mtx_unlock(&nodes_monitors_mtx);
}
static Eterm
insert_nodes_monitor(Process *c_p, Uint32 opts)
{
Uint16 no = 1;
Eterm res = am_false;
ErtsNodesMonitor *xnmp, *nmp;
ERTS_SMP_LC_ASSERT(erts_smp_lc_mtx_is_locked(&nodes_monitors_mtx));
ERTS_SMP_LC_ASSERT(erts_proc_lc_my_proc_locks(c_p) & ERTS_PROC_LOCK_MAIN);
xnmp = c_p->nodes_monitors;
if (xnmp) {
ASSERT(!xnmp->prev || xnmp->prev->proc != c_p);
while (1) {
ASSERT(xnmp->proc == c_p);
if (xnmp->opts == opts)
break;
if (!xnmp->next || xnmp->next->proc != c_p)
break;
xnmp = xnmp->next;
}
ASSERT(xnmp);
ASSERT(xnmp->proc == c_p);
ASSERT(xnmp->opts == opts
|| !xnmp->next
|| xnmp->next->proc != c_p);
if (xnmp->opts != opts)
goto alloc_new;
else {
res = am_true;
no = xnmp->no++;
if (!xnmp->no) {
/*
* 'no' wrapped; transfer all prevous monitors to new
* element (which will be the next element in the list)
* and set this to one...
*/
xnmp->no = 1;
goto alloc_new;
}
}
}
else {
alloc_new:
nmp = erts_alloc(ERTS_ALC_T_NODES_MON, sizeof(ErtsNodesMonitor));
nmp->proc = c_p;
nmp->opts = opts;
nmp->no = no;
if (xnmp) {
ASSERT(nodes_monitors);
ASSERT(c_p->nodes_monitors);
nmp->next = xnmp->next;
nmp->prev = xnmp;
xnmp->next = nmp;
if (nmp->next) {
ASSERT(nodes_monitors_end != xnmp);
ASSERT(nmp->next->prev == xnmp);
nmp->next->prev = nmp;
}
else {
ASSERT(nodes_monitors_end == xnmp);
nodes_monitors_end = nmp;
}
}
else {
ASSERT(!c_p->nodes_monitors);
c_p->nodes_monitors = nmp;
nmp->next = NULL;
nmp->prev = nodes_monitors_end;
if (nodes_monitors_end) {
ASSERT(nodes_monitors);
nodes_monitors_end->next = nmp;
}
else {
ASSERT(!nodes_monitors);
nodes_monitors = nmp;
}
nodes_monitors_end = nmp;
}
}
return res;
}
static Eterm
remove_nodes_monitors(Process *c_p, Uint32 opts, int all)
{
Eterm res = am_false;
ErtsNodesMonitor *nmp;
ERTS_SMP_LC_ASSERT(erts_smp_lc_mtx_is_locked(&nodes_monitors_mtx));
ERTS_SMP_LC_ASSERT(erts_proc_lc_my_proc_locks(c_p) & ERTS_PROC_LOCK_MAIN);
nmp = c_p->nodes_monitors;
ASSERT(!nmp || !nmp->prev || nmp->prev->proc != c_p);
while (nmp && nmp->proc == c_p) {
if (!all && nmp->opts != opts)
nmp = nmp->next;
else { /* if (all || nmp->opts == opts) */
ErtsNodesMonitor *free_nmp;
res = am_true;
if (nmp->prev) {
ASSERT(nodes_monitors != nmp);
nmp->prev->next = nmp->next;
}
else {
ASSERT(nodes_monitors == nmp);
nodes_monitors = nmp->next;
}
if (nmp->next) {
ASSERT(nodes_monitors_end != nmp);
nmp->next->prev = nmp->prev;
}
else {
ASSERT(nodes_monitors_end == nmp);
nodes_monitors_end = nmp->prev;
}
free_nmp = nmp;
nmp = nmp->next;
if (c_p->nodes_monitors == free_nmp)
c_p->nodes_monitors = nmp && nmp->proc == c_p ? nmp : NULL;
erts_free(ERTS_ALC_T_NODES_MON, free_nmp);
}
}
ASSERT(!all || !c_p->nodes_monitors);
return res;
}
void
erts_delete_nodes_monitors(Process *c_p, ErtsProcLocks locks)
{
#if defined(ERTS_ENABLE_LOCK_CHECK) && defined(ERTS_SMP)
if (c_p) {
ErtsProcLocks might_unlock = locks & ~ERTS_PROC_LOCK_MAIN;
if (might_unlock)
erts_proc_lc_might_unlock(c_p, might_unlock);
}
#endif
if (erts_smp_mtx_trylock(&nodes_monitors_mtx) == EBUSY) {
ErtsProcLocks unlock_locks = locks & ~ERTS_PROC_LOCK_MAIN;
if (c_p && unlock_locks)
erts_smp_proc_unlock(c_p, unlock_locks);
erts_smp_mtx_lock(&nodes_monitors_mtx);
if (c_p && unlock_locks)
erts_smp_proc_lock(c_p, unlock_locks);
}
remove_nodes_monitors(c_p, 0, 1);
erts_smp_mtx_unlock(&nodes_monitors_mtx);
}
Eterm
erts_monitor_nodes(Process *c_p, Eterm on, Eterm olist)
{
Eterm res;
Eterm opts_list = olist;
Uint16 opts = (Uint16) 0;
ASSERT(c_p);
ERTS_SMP_LC_ASSERT(erts_proc_lc_my_proc_locks(c_p) == ERTS_PROC_LOCK_MAIN);
if (on != am_true && on != am_false)
return THE_NON_VALUE;
if (is_not_nil(opts_list)) {
int all = 0, visible = 0, hidden = 0;
while (is_list(opts_list)) {
Eterm *cp = list_val(opts_list);
Eterm opt = CAR(cp);
opts_list = CDR(cp);
if (opt == am_nodedown_reason)
opts |= ERTS_NODES_MON_OPT_DOWN_REASON;
else if (is_tuple(opt)) {
Eterm* tp = tuple_val(opt);
if (arityval(tp[0]) != 2)
return THE_NON_VALUE;
switch (tp[1]) {
case am_node_type:
switch (tp[2]) {
case am_visible:
if (hidden || all)
return THE_NON_VALUE;
opts |= ERTS_NODES_MON_OPT_TYPE_VISIBLE;
visible = 1;
break;
case am_hidden:
if (visible || all)
return THE_NON_VALUE;
opts |= ERTS_NODES_MON_OPT_TYPE_HIDDEN;
hidden = 1;
break;
case am_all:
if (visible || hidden)
return THE_NON_VALUE;
opts |= ERTS_NODES_MON_OPT_TYPES;
all = 1;
break;
default:
return THE_NON_VALUE;
}
break;
default:
return THE_NON_VALUE;
}
}
else {
return THE_NON_VALUE;
}
}
if (is_not_nil(opts_list))
return THE_NON_VALUE;
}
erts_smp_mtx_lock(&nodes_monitors_mtx);
if (on == am_true)
res = insert_nodes_monitor(c_p, opts);
else
res = remove_nodes_monitors(c_p, opts, 0);
erts_smp_mtx_unlock(&nodes_monitors_mtx);
return res;
}
/*
* Note, this function is only used for debuging.
*/
Eterm
erts_processes_monitoring_nodes(Process *c_p)
{
ErtsNodesMonitor *nmp;
Eterm res;
Eterm *hp;
Eterm **hpp;
Uint sz;
Uint *szp;
#ifdef DEBUG
Eterm *hend;
#endif
ASSERT(c_p);
ERTS_SMP_LC_ASSERT(erts_proc_lc_my_proc_locks(c_p) == ERTS_PROC_LOCK_MAIN);
erts_smp_mtx_lock(&nodes_monitors_mtx);
sz = 0;
szp = &sz;
hpp = NULL;
bld_result:
res = NIL;
for (nmp = nodes_monitors_end; nmp; nmp = nmp->prev) {
Uint16 i;
for (i = 0; i < nmp->no; i++) {
Eterm olist = NIL;
if (nmp->opts & ERTS_NODES_MON_OPT_TYPES) {
Eterm type;
switch (nmp->opts & ERTS_NODES_MON_OPT_TYPES) {
case ERTS_NODES_MON_OPT_TYPES: type = am_all; break;
case ERTS_NODES_MON_OPT_TYPE_VISIBLE: type = am_visible; break;
case ERTS_NODES_MON_OPT_TYPE_HIDDEN: type = am_hidden; break;
default: erl_exit(ERTS_ABORT_EXIT, "Bad node type found\n");
}
olist = erts_bld_cons(hpp, szp,
erts_bld_tuple(hpp, szp, 2,
am_node_type,
type),
olist);
}
if (nmp->opts & ERTS_NODES_MON_OPT_DOWN_REASON)
olist = erts_bld_cons(hpp, szp, am_nodedown_reason, olist);
res = erts_bld_cons(hpp, szp,
erts_bld_tuple(hpp, szp, 2,
nmp->proc->id,
olist),
res);
}
}
if (!hpp) {
hp = HAlloc(c_p, sz);
#ifdef DEBUG
hend = hp + sz;
#endif
hpp = &hp;
szp = NULL;
goto bld_result;
}
ASSERT(hp == hend);
erts_smp_mtx_unlock(&nodes_monitors_mtx);
return res;
}
