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
|
/* Linuxthreads - a simple clone()-based implementation of Posix */
/* threads for Linux. */
/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */
/* */
/* This program is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU Library General Public License */
/* as published by the Free Software Foundation; either version 2 */
/* of the License, or (at your option) any later version. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU Library General Public License for more details. */
#include <signal.h>
/* Primitives for controlling thread execution */
static inline void restart(pthread_descr th)
{
kill(th->p_pid, PTHREAD_SIG_RESTART);
}
static inline void suspend(pthread_descr self)
{
sigset_t mask;
sigprocmask(SIG_SETMASK, NULL, &mask); /* Get current signal mask */
sigdelset(&mask, PTHREAD_SIG_RESTART); /* Unblock the restart signal */
do {
self->p_signal = 0;
sigsuspend(&mask); /* Wait for signal */
} while (self->p_signal != PTHREAD_SIG_RESTART);
}
static inline void suspend_with_cancellation(pthread_descr self)
{
sigset_t mask;
sigjmp_buf jmpbuf;
sigprocmask(SIG_SETMASK, NULL, &mask); /* Get current signal mask */
sigdelset(&mask, PTHREAD_SIG_RESTART); /* Unblock the restart signal */
/* No need to save the signal mask, we'll restore it ourselves */
if (sigsetjmp(jmpbuf, 0) == 0) {
self->p_cancel_jmp = &jmpbuf;
if (! (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE)) {
do {
self->p_signal = 0;
sigsuspend(&mask); /* Wait for a signal */
} while (self->p_signal != PTHREAD_SIG_RESTART);
}
self->p_cancel_jmp = NULL;
} else {
sigaddset(&mask, PTHREAD_SIG_RESTART); /* Reblock the restart signal */
sigprocmask(SIG_SETMASK, &mask, NULL);
}
}
|
