1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* %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 + ERTS_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 */
|
