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