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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2004-2016. 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%
*/
/**********************************************************************
* Header for monitors and links data structures.
* Monitors are kept in an AVL tree and the data structures for
* the four different types of monitors are like this:
**********************************************************************
* Local monitor by pid/port:
* (Ref is always same in all involved data structures)
**********************************************************************
* Process/Port X Process Y
* +-------------+ +-------------+
* Type: | MON_ORIGIN | | MON_TARGET |
* +-------------+ +-------------+
* Pid: | Pid(Y) | | Pid/Port(X) |
* +-------------+ +-------------+
* Name: | [] | | [] |
* +-------------+ +-------------+
**********************************************************************
* Local monitor by name: (Ref is always same in all involved data structures)
**********************************************************************
* Process X Process Y (name foo)
* +-------------+ +-------------+
* Type: | MON_ORIGIN | | MON_TARGET |
* +-------------+ +-------------+
* Pid: | Pid(Y) | | Pid(X) |
* +-------------+ +-------------+
* Name: | Atom(foo) | | Atom(foo) |
* +-------------+ +-------------+
**********************************************************************
* Remote monitor by pid: (Ref is always same in all involved data structures)
**********************************************************************
* Node A | Node B
* ---------------------------------+----------------------------------
* Process X (@A) Distentry @A Distentry @B Process Y (@B)
* for node B for node A
* +-------------+ +-------------+ +-------------+ +-------------+
* Type: | MON_ORIGIN | | MON_TARGET | | MON_ORIGIN | | MON_TARGET |
* +-------------+ +-------------+ +-------------+ +-------------+
* Pid: | Pid(Y) | | Pid(X) | | Pid(Y) | | Pid(X) |
* +-------------+ +-------------+ +-------------+ +-------------+
* Name: | [] | | [] | | [] | | [] |
* +-------------+ +-------------+ +-------------+ +-------------+
**********************************************************************
* Remote monitor by name: (Ref is always same in all involved data structures)
**********************************************************************
* Node A | Node B
* ---------------------------------+----------------------------------
* Process X (@A) Distentry @A Distentry @B Process Y (@B)
* for node B for node A (name foo)
* +-------------+ +-------------+ +-------------+ +-------------+
* Type: | MON_ORIGIN | | MON_TARGET | | MON_ORIGIN | | MON_TARGET |
* +-------------+ +-------------+ +-------------+ +-------------+
* Pid: | Atom(node B)| | Pid(X) | | Pid(Y) | | Pid(X) |
* +-------------+ +-------------+ +-------------+ +-------------+
* Name: | Atom(foo) | | Atom(foo) | | Atom(foo) | | Atom(foo) |
* +-------------+ +-------------+ +-------------+ +-------------+
* The reason for the node atom in X->pid is that we don't know the actual
* pid of the monitored process on the other node when setting the monitor
* (which is done asyncronously).
**********************************************************************/
#ifndef _ERL_MONITORS_H
#define _ERL_MONITORS_H
/* Type tags for monitors */
#define MON_ORIGIN 1
#define MON_TARGET 3
#define MON_TIME_OFFSET 7
/* Type tags for links */
#define LINK_PID 1 /* ...Or port */
#define LINK_NODE 3 /* "Node monitor" */
/* Size of a monitor without heap, in words (fixalloc) */
#define ERTS_MONITOR_SIZE ((sizeof(ErtsMonitor) - sizeof(Uint))/sizeof(Uint))
#define ERTS_MONITOR_SH_SIZE (ERTS_MONITOR_SIZE + REF_THING_SIZE)
#define ERTS_LINK_SIZE ((sizeof(ErtsLink) - sizeof(Uint))/sizeof(Uint))
#define ERTS_LINK_SH_SIZE ERTS_LINK_SIZE /* Size of fix-alloced links */
/* ErtsMonitor and ErtsLink *need* to begin in a similar way as
ErtsMonitorOrLink */
typedef struct erts_monitor_or_link {
struct erts_monitor_or_link *left, *right;
Sint16 balance;
} ErtsMonitorOrLink;
typedef struct erts_monitor {
struct erts_monitor *left, *right;
Sint16 balance;
Uint16 type; /* MON_ORIGIN | MON_TARGET | MON_TIME_OFFSET */
Eterm ref;
Eterm pid; /* In case of distributed named monitor, this is the
nodename atom in MON_ORIGIN process, otherwise a pid or
, in case of a MON_TARGET, a port */
Eterm name; /* When monitoring a named process: atom() else [] */
Uint heap[1]; /* Larger in reality */
} ErtsMonitor;
typedef struct erts_link {
struct erts_link *left, *right;
Sint16 balance;
Uint16 type; /* LINK_PID | LINK_NODE */
Eterm pid; /* When node monitor,
the node atom is here instead */
union {
struct erts_link *root; /* Used only in dist entries */
Uint refc;
} shared;
Uint heap[1]; /* Larger in reality */
} ErtsLink;
typedef struct erts_suspend_monitor {
struct erts_suspend_monitor *left, *right;
Sint16 balance;
int pending;
int active;
Eterm pid;
} ErtsSuspendMonitor;
#define ERTS_LINK_ROOT(Linkp) ((Linkp)->shared.root)
#define ERTS_LINK_REFC(Linkp) ((Linkp)->shared.refc)
Uint erts_tot_link_lh_size(void);
/* Prototypes */
void erts_destroy_monitor(ErtsMonitor *mon);
void erts_add_monitor(ErtsMonitor **root, Uint type, Eterm ref, Eterm pid,
Eterm name);
ErtsMonitor *erts_remove_monitor(ErtsMonitor **root, Eterm ref);
ErtsMonitor *erts_lookup_monitor(ErtsMonitor *root, Eterm ref);
void erts_sweep_monitors(ErtsMonitor *root,
void (*doit)(ErtsMonitor *, void *),
void *context);
void erts_destroy_link(ErtsLink *lnk);
/* Returns 0 if OK, < 0 if already present */
int erts_add_link(ErtsLink **root, Uint type, Eterm pid);
ErtsLink *erts_add_or_lookup_link(ErtsLink **root, Uint type, Eterm pid);
ErtsLink *erts_remove_link(ErtsLink **root, Eterm pid);
ErtsLink *erts_lookup_link(ErtsLink *root, Eterm pid);
void erts_sweep_links(ErtsLink *root,
void (*doit)(ErtsLink *, void *),
void *context);
void erts_destroy_suspend_monitor(ErtsSuspendMonitor *sproc);
void erts_sweep_suspend_monitors(ErtsSuspendMonitor *root,
void (*doit)(ErtsSuspendMonitor *, void *),
void *context);
ErtsSuspendMonitor *erts_add_or_lookup_suspend_monitor(ErtsSuspendMonitor **root,
Eterm pid);
ErtsSuspendMonitor *erts_lookup_suspend_monitor(ErtsSuspendMonitor *root,
Eterm pid);
void erts_delete_suspend_monitor(ErtsSuspendMonitor **root, Eterm pid);
void erts_init_monitors(void);
void erts_one_link_size(ErtsLink *lnk, void *vpu);
void erts_one_mon_size(ErtsMonitor *mon, void *vpu);
#define erts_doforall_monitors erts_sweep_monitors
#define erts_doforall_links erts_sweep_links
#define erts_doforall_suspend_monitors erts_sweep_suspend_monitors
#endif /* _ERL_MONITORS_H */
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