path: root/erts/emulator/beam/erl_node_tables.h

/*
 * %CopyrightBegin%
 *
 * Copyright Ericsson AB 2001-2017. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * %CopyrightEnd%
 */

#ifndef ERL_NODE_TABLES_H__
#define ERL_NODE_TABLES_H__

/*
 * The "node_tables module" contain two (hash) tables: the node_table
 * and the dist_table.
 *
 * The elements of the node_table represents a specific incarnation of
 * an Erlang node and has {Nodename, Creation} pairs as keys. Elements
 * in the node_table are referred to from node containers (see
 * node_container_utils.h).
 *
 * The elements of the dist_table represents a (potential) connection
 * to an Erlang node and has Nodename as key. Elements in the
 * dist_table are either referred to from elements in the node_table
 * or from the process or port structure of the entity controlling
 * the connection.
 *
 * Both tables are garbage collected by reference counting.
 */

#include "sys.h"
#include "hash.h"
#include "erl_alloc.h"
#include "erl_process.h"
#include "erl_monitors.h"
#define ERTS_PORT_TASK_ONLY_BASIC_TYPES__
#include "erl_port_task.h"
#undef ERTS_PORT_TASK_ONLY_BASIC_TYPES__
#define ERTS_BINARY_TYPES_ONLY__
#include "erl_binary.h"
#undef ERTS_BINARY_TYPES_ONLY__

#define ERTS_NODE_TAB_DELAY_GC_DEFAULT (60)
#define ERTS_NODE_TAB_DELAY_GC_MAX (100*1000*1000)
#define ERTS_NODE_TAB_DELAY_GC_INFINITY (ERTS_NODE_TAB_DELAY_GC_MAX+1)
 
#define ERST_INTERNAL_CHANNEL_NO 0

#define ERTS_DE_SFLG_PENDING			(((Uint32) 1) <<  0)
#define ERTS_DE_SFLG_CONNECTED			(((Uint32) 1) <<  1)
#define ERTS_DE_SFLG_EXITING			(((Uint32) 1) <<  2)

#define ERTS_DE_QFLG_BUSY			(((erts_aint32_t) 1) <<  0)
#define ERTS_DE_QFLG_EXIT			(((erts_aint32_t) 1) <<  1)
#define ERTS_DE_QFLG_REQ_INFO			(((erts_aint32_t) 1) <<  2)
#define ERTS_DE_QFLG_PORT_CTRL                  (((erts_aint32_t) 1) <<  3)
#define ERTS_DE_QFLG_PROC_CTRL                  (((erts_aint32_t) 1) <<  4)

#define ERTS_DE_QFLGS_ALL			(ERTS_DE_QFLG_BUSY \
						 | ERTS_DE_QFLG_EXIT \
                                                 | ERTS_DE_QFLG_REQ_INFO \
                                                 | ERTS_DE_QFLG_PORT_CTRL \
                                                 | ERTS_DE_QFLG_PROC_CTRL)

#if defined(ARCH_64)
#define ERTS_DIST_OUTPUT_BUF_DBG_PATTERN ((Uint) 0xf713f713f713f713UL)
#else
#define ERTS_DIST_OUTPUT_BUF_DBG_PATTERN ((Uint) 0xf713f713)
#endif

typedef struct ErtsDistOutputBuf_ ErtsDistOutputBuf;
struct ErtsDistOutputBuf_ {
#ifdef DEBUG
    Uint dbg_pattern;
    byte *alloc_endp;
#endif
    ErtsDistOutputBuf *next;
    byte *extp;
    byte *ext_endp;
    byte *msg_start;
    byte data[1];
};

typedef struct {
    ErtsDistOutputBuf *first;
    ErtsDistOutputBuf *last;
} ErtsDistOutputQueue;

struct ErtsProcList_;

/*
 * Lock order:
 *   1. dist_entry->rwmtx
 *   2. erts_node_table_rwmtx
 *   3. erts_dist_table_rwmtx
 *
 *   Lock mutexes with lower numbers before mutexes with higher numbers and
 *   unlock mutexes with higher numbers before mutexes with higher numbers.
 */

typedef struct dist_entry_ {
    HashBucket hash_bucket;     /* Hash bucket */
    struct dist_entry_ *next;	/* Next entry in dist_table (not sorted) */
    struct dist_entry_ *prev;	/* Previous entry in dist_table (not sorted) */

    erts_rwmtx_t rwmtx;         /* Protects all fields below until lck_mtx. */
    Eterm sysname;		/* name@host atom for efficiency */
    Uint32 creation;		/* creation of connected node */
    erts_atomic_t input_handler; /* Input handler */
    Eterm cid;			/* connection handler (pid or port),
                                   NIL == free */
    Uint32 connection_id;	/* Connection id incremented on connect */
    Uint32 status;		/* Slot status, like exiting reserved etc */
    Uint32 flags;		/* Distribution flags, like hidden, 
				   atom cache etc. */
    unsigned long version;	/* Protocol version */


    erts_mtx_t lnk_mtx;         /* Protects node_links, nlinks, and
				   monitors. */
    ErtsLink *node_links;       /* In a dist entry, node links are kept 
				   in a separate tree, while they are 
				   colocted with the ordinary link tree
				   for processes. It's not due to confusion,
				   it's because the link tree for the dist 
				   entry is in two levels, see erl_monitors.h 
				*/
    ErtsLink *nlinks;           /* Link tree with subtrees */
    ErtsMonitor *monitors;      /* Monitor tree */

    erts_mtx_t qlock;           /* Protects qflgs and out_queue */
    erts_atomic32_t qflgs;
    erts_atomic_t qsize;
    erts_atomic64_t in;
    erts_atomic64_t out;
    ErtsDistOutputQueue out_queue;
    struct ErtsProcList_ *suspended;

    ErtsDistOutputQueue tmp_out_queue;
    ErtsDistOutputQueue finalized_out_queue;
    erts_atomic_t dist_cmd_scheduled;
    ErtsPortTaskHandle dist_cmd;

    Uint (*send)(Port *prt, ErtsDistOutputBuf *obuf);

    struct cache* cache;	/* The atom cache */

    ErtsThrPrgrLaterOp later_op;

    struct transcode_context* transcode_ctx;
} DistEntry;

typedef struct erl_node_ {
  HashBucket hash_bucket;	/* Hash bucket */
  erts_refc_t refc;		/* Reference count */
  Eterm	sysname;		/* name@host atom for efficiency */
  Uint32 creation;		/* Creation */
  DistEntry *dist_entry;	/* Corresponding dist entry */
} ErlNode;


extern Hash erts_dist_table;
extern Hash erts_node_table;
extern erts_rwmtx_t erts_dist_table_rwmtx;
extern erts_rwmtx_t erts_node_table_rwmtx;

extern DistEntry *erts_hidden_dist_entries;
extern DistEntry *erts_visible_dist_entries;
extern DistEntry *erts_not_connected_dist_entries;
extern Sint erts_no_of_hidden_dist_entries;
extern Sint erts_no_of_visible_dist_entries;
extern Sint erts_no_of_not_connected_dist_entries;

extern DistEntry *erts_this_dist_entry;
extern ErlNode *erts_this_node;
extern char *erts_this_node_sysname; /* must match erl_node_tables.c */

Uint erts_delayed_node_table_gc(void);
DistEntry *erts_channel_no_to_dist_entry(Uint);
DistEntry *erts_sysname_to_connected_dist_entry(Eterm);
DistEntry *erts_find_or_insert_dist_entry(Eterm);
DistEntry *erts_find_dist_entry(Eterm);
void erts_schedule_delete_dist_entry(DistEntry *);
Uint erts_dist_table_size(void);
void erts_dist_table_info(fmtfn_t, void *);
void erts_set_dist_entry_not_connected(DistEntry *);
void erts_set_dist_entry_connected(DistEntry *, Eterm, Uint);
ErlNode *erts_find_or_insert_node(Eterm, Uint32);
void erts_schedule_delete_node(ErlNode *);
void erts_set_this_node(Eterm, Uint);
Uint erts_node_table_size(void);
void erts_init_node_tables(int);
void erts_node_table_info(fmtfn_t, void *);
void erts_print_node_info(fmtfn_t, void *, Eterm, int*, int*);
Eterm erts_get_node_and_dist_references(struct process *);
#if defined(ERTS_ENABLE_LOCK_CHECK)
int erts_lc_is_de_rwlocked(DistEntry *);
int erts_lc_is_de_rlocked(DistEntry *);
#endif
int erts_dist_entry_destructor(Binary *bin);
DistEntry *erts_dhandle_to_dist_entry(Eterm dhandle);
Eterm erts_build_dhandle(Eterm **hpp, ErlOffHeap*, DistEntry*);
Eterm erts_make_dhandle(Process *c_p, DistEntry *dep);
void erts_ref_dist_entry(DistEntry *dep);
void erts_deref_dist_entry(DistEntry *dep);

ERTS_GLB_INLINE void erts_deref_node_entry(ErlNode *np);
ERTS_GLB_INLINE void erts_de_rlock(DistEntry *dep);
ERTS_GLB_INLINE void erts_de_runlock(DistEntry *dep);
ERTS_GLB_INLINE void erts_de_rwlock(DistEntry *dep);
ERTS_GLB_INLINE void erts_de_rwunlock(DistEntry *dep);
ERTS_GLB_INLINE void erts_de_links_lock(DistEntry *dep);
ERTS_GLB_INLINE void erts_de_links_unlock(DistEntry *dep);

#if ERTS_GLB_INLINE_INCL_FUNC_DEF

ERTS_GLB_INLINE void
erts_deref_node_entry(ErlNode *np)
{
    ASSERT(np);
    if (erts_refc_dectest(&np->refc, 0) == 0)
	erts_schedule_delete_node(np);
}

ERTS_GLB_INLINE void
erts_de_rlock(DistEntry *dep)
{
    erts_rwmtx_rlock(&dep->rwmtx);
}

ERTS_GLB_INLINE void
erts_de_runlock(DistEntry *dep)
{
    erts_rwmtx_runlock(&dep->rwmtx);
}

ERTS_GLB_INLINE void
erts_de_rwlock(DistEntry *dep)
{
    erts_rwmtx_rwlock(&dep->rwmtx);
}

ERTS_GLB_INLINE void
erts_de_rwunlock(DistEntry *dep)
{
    erts_rwmtx_rwunlock(&dep->rwmtx);
}

ERTS_GLB_INLINE void
erts_de_links_lock(DistEntry *dep)
{
    erts_mtx_lock(&dep->lnk_mtx);
}

ERTS_GLB_INLINE void
erts_de_links_unlock(DistEntry *dep)
{
    erts_mtx_unlock(&dep->lnk_mtx);
}

#endif /* #if ERTS_GLB_INLINE_INCL_FUNC_DEF */

void erts_debug_test_node_tab_delayed_delete(Sint64 millisecs);
void erts_lcnt_update_distribution_locks(int enable);

#endif