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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2011. 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%
*/
#ifndef __DIST_H__
#define __DIST_H__
#include "erl_process.h"
#include "erl_node_tables.h"
#define DFLAG_PUBLISHED 0x01
#define DFLAG_ATOM_CACHE 0x02
#define DFLAG_EXTENDED_REFERENCES 0x04
#define DFLAG_DIST_MONITOR 0x08
#define DFLAG_FUN_TAGS 0x10
#define DFLAG_DIST_MONITOR_NAME 0x20
#define DFLAG_HIDDEN_ATOM_CACHE 0x40
#define DFLAG_NEW_FUN_TAGS 0x80
#define DFLAG_EXTENDED_PIDS_PORTS 0x100
#define DFLAG_EXPORT_PTR_TAG 0x200
#define DFLAG_BIT_BINARIES 0x400
#define DFLAG_NEW_FLOATS 0x800
#define DFLAG_UNICODE_IO 0x1000
#define DFLAG_DIST_HDR_ATOM_CACHE 0x2000
#define DFLAG_SMALL_ATOM_TAGS 0x4000
#define DFLAGS_INTERNAL_TAGS 0x8000
/* All flags that should be enabled when term_to_binary/1 is used. */
#define TERM_TO_BINARY_DFLAGS (DFLAG_EXTENDED_REFERENCES \
| DFLAG_NEW_FUN_TAGS \
| DFLAG_EXTENDED_PIDS_PORTS \
| DFLAG_EXPORT_PTR_TAG \
| DFLAG_BIT_BINARIES)
/* opcodes used in distribution messages */
#define DOP_LINK 1
#define DOP_SEND 2
#define DOP_EXIT 3
#define DOP_UNLINK 4
/* Ancient DOP_NODE_LINK (5) was here, can be reused */
#define DOP_REG_SEND 6
#define DOP_GROUP_LEADER 7
#define DOP_EXIT2 8
#define DOP_SEND_TT 12
#define DOP_EXIT_TT 13
#define DOP_REG_SEND_TT 16
#define DOP_EXIT2_TT 18
#define DOP_MONITOR_P 19
#define DOP_DEMONITOR_P 20
#define DOP_MONITOR_P_EXIT 21
/* distribution trap functions */
extern Export* dsend2_trap;
extern Export* dsend3_trap;
extern Export* dlink_trap;
extern Export* dunlink_trap;
extern Export* dmonitor_node_trap;
extern Export* dgroup_leader_trap;
extern Export* dexit_trap;
extern Export* dmonitor_p_trap;
typedef enum {
ERTS_DSP_NO_LOCK,
ERTS_DSP_RLOCK,
ERTS_DSP_RWLOCK
} ErtsDSigPrepLock;
typedef struct {
Process *proc;
DistEntry *dep;
Eterm cid;
Eterm connection_id;
int no_suspend;
} ErtsDSigData;
#define ERTS_DE_IS_NOT_CONNECTED(DEP) \
(ERTS_SMP_LC_ASSERT(erts_lc_rwmtx_is_rlocked(&(DEP)->rwmtx) \
|| erts_lc_rwmtx_is_rwlocked(&(DEP)->rwmtx)), \
(is_nil((DEP)->cid) || ((DEP)->status & ERTS_DE_SFLG_EXITING)))
#define ERTS_DE_IS_CONNECTED(DEP) \
(!ERTS_DE_IS_NOT_CONNECTED((DEP)))
#define ERTS_DE_BUSY_LIMIT (1024*1024)
extern int erts_dist_buf_busy_limit;
extern int erts_is_alive;
/*
* erts_dsig_prepare() prepares a send of a distributed signal.
* One of the values defined below are returned. If the returned
* value is another than ERTS_DSIG_PREP_CONNECTED, the
* distributed signal cannot be sent before apropriate actions
* have been taken. Apropriate actions would typically be setting
* up the connection.
*/
/* Connected; signal can be sent. */
#define ERTS_DSIG_PREP_CONNECTED 0
/* Not connected; connection needs to be set up. */
#define ERTS_DSIG_PREP_NOT_CONNECTED 1
/* Caller would be suspended on send operation. */
#define ERTS_DSIG_PREP_WOULD_SUSPEND 2
/* System not alive (distributed) */
#define ERTS_DSIG_PREP_NOT_ALIVE 3
ERTS_GLB_INLINE int erts_dsig_prepare(ErtsDSigData *,
DistEntry *,
Process *,
ErtsDSigPrepLock,
int);
ERTS_GLB_INLINE
void erts_schedule_dist_command(Port *, DistEntry *);
#if ERTS_GLB_INLINE_INCL_FUNC_DEF
ERTS_GLB_INLINE int
erts_dsig_prepare(ErtsDSigData *dsdp,
DistEntry *dep,
Process *proc,
ErtsDSigPrepLock dspl,
int no_suspend)
{
int failure;
if (!erts_is_alive)
return ERTS_DSIG_PREP_NOT_ALIVE;
if (!dep)
return ERTS_DSIG_PREP_NOT_CONNECTED;
if (dspl == ERTS_DSP_RWLOCK)
erts_smp_de_rwlock(dep);
else
erts_smp_de_rlock(dep);
if (ERTS_DE_IS_NOT_CONNECTED(dep)) {
failure = ERTS_DSIG_PREP_NOT_CONNECTED;
goto fail;
}
if (no_suspend) {
failure = ERTS_DSIG_PREP_CONNECTED;
erts_smp_mtx_lock(&dep->qlock);
if (dep->qflgs & ERTS_DE_QFLG_BUSY)
failure = ERTS_DSIG_PREP_WOULD_SUSPEND;
erts_smp_mtx_unlock(&dep->qlock);
if (failure == ERTS_DSIG_PREP_WOULD_SUSPEND)
goto fail;
}
dsdp->proc = proc;
dsdp->dep = dep;
dsdp->cid = dep->cid;
dsdp->connection_id = dep->connection_id;
dsdp->no_suspend = no_suspend;
if (dspl == ERTS_DSP_NO_LOCK)
erts_smp_de_runlock(dep);
return ERTS_DSIG_PREP_CONNECTED;
fail:
if (dspl == ERTS_DSP_RWLOCK)
erts_smp_de_rwunlock(dep);
else
erts_smp_de_runlock(dep);
return failure;
}
ERTS_GLB_INLINE
void erts_schedule_dist_command(Port *prt, DistEntry *dist_entry)
{
DistEntry *dep;
Eterm id;
if (prt) {
ERTS_SMP_LC_ASSERT(erts_lc_is_port_locked(prt));
ASSERT((erts_smp_atomic32_read_nob(&prt->state)
& ERTS_PORT_SFLGS_DEAD) == 0);
ASSERT(prt->dist_entry);
dep = prt->dist_entry;
id = prt->id;
}
else {
ASSERT(dist_entry);
ERTS_SMP_LC_ASSERT(erts_lc_rwmtx_is_rlocked(&dist_entry->rwmtx)
|| erts_lc_rwmtx_is_rwlocked(&dist_entry->rwmtx));
ASSERT(is_internal_port(dist_entry->cid));
dep = dist_entry;
id = dep->cid;
}
if (!erts_smp_atomic_xchg_mb(&dep->dist_cmd_scheduled, 1)) {
(void) erts_port_task_schedule(id,
&dep->dist_cmd,
ERTS_PORT_TASK_DIST_CMD,
(ErlDrvEvent) -1,
NULL);
}
}
#endif
typedef struct {
ErtsLink *d_lnk;
ErtsLink *d_sub_lnk;
} ErtsDistLinkData;
ERTS_GLB_INLINE void erts_remove_dist_link(ErtsDistLinkData *,
Eterm,
Eterm,
DistEntry *);
ERTS_GLB_INLINE int erts_was_dist_link_removed(ErtsDistLinkData *);
ERTS_GLB_INLINE void erts_destroy_dist_link(ErtsDistLinkData *);
#if ERTS_GLB_INLINE_INCL_FUNC_DEF
ERTS_GLB_INLINE void
erts_remove_dist_link(ErtsDistLinkData *dldp,
Eterm lid,
Eterm rid,
DistEntry *dep)
{
erts_smp_de_links_lock(dep);
dldp->d_lnk = erts_lookup_link(dep->nlinks, lid);
if (!dldp->d_lnk)
dldp->d_sub_lnk = NULL;
else {
dldp->d_sub_lnk = erts_remove_link(&ERTS_LINK_ROOT(dldp->d_lnk), rid);
dldp->d_lnk = (ERTS_LINK_ROOT(dldp->d_lnk)
? NULL
: erts_remove_link(&dep->nlinks, lid));
}
erts_smp_de_links_unlock(dep);
}
ERTS_GLB_INLINE int
erts_was_dist_link_removed(ErtsDistLinkData *dldp)
{
return dldp->d_sub_lnk != NULL;
}
ERTS_GLB_INLINE void
erts_destroy_dist_link(ErtsDistLinkData *dldp)
{
if (dldp->d_lnk)
erts_destroy_link(dldp->d_lnk);
if (dldp->d_sub_lnk)
erts_destroy_link(dldp->d_sub_lnk);
}
#endif
/*
* erts_dsig_send_* return values.
*/
#define ERTS_DSIG_SEND_OK 0
#define ERTS_DSIG_SEND_YIELD 1
extern int erts_dsig_send_link(ErtsDSigData *, Eterm, Eterm);
extern int erts_dsig_send_msg(ErtsDSigData *, Eterm, Eterm);
extern int erts_dsig_send_exit_tt(ErtsDSigData *, Eterm, Eterm, Eterm, Eterm);
extern int erts_dsig_send_unlink(ErtsDSigData *, Eterm, Eterm);
extern int erts_dsig_send_reg_msg(ErtsDSigData *, Eterm, Eterm);
extern int erts_dsig_send_group_leader(ErtsDSigData *, Eterm, Eterm);
extern int erts_dsig_send_exit(ErtsDSigData *, Eterm, Eterm, Eterm);
extern int erts_dsig_send_exit2(ErtsDSigData *, Eterm, Eterm, Eterm);
extern int erts_dsig_send_demonitor(ErtsDSigData *, Eterm, Eterm, Eterm, int);
extern int erts_dsig_send_monitor(ErtsDSigData *, Eterm, Eterm, Eterm);
extern int erts_dsig_send_m_exit(ErtsDSigData *, Eterm, Eterm, Eterm, Eterm);
extern int erts_dist_command(Port *prt, int reds);
extern void erts_dist_port_not_busy(Port *prt);
extern void erts_kill_dist_connection(DistEntry *dep, Uint32);
extern Uint erts_dist_cache_size(void);
#endif
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