132 lines
4.2 KiB
C
132 lines
4.2 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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/* Thread cancellation */
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#include <errno.h>
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#include "pthread.h"
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#include "internals.h"
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#include "spinlock.h"
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#include "restart.h"
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int pthread_setcancelstate(int state, int * oldstate)
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{
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pthread_descr self = thread_self();
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if (state < PTHREAD_CANCEL_ENABLE || state > PTHREAD_CANCEL_DISABLE)
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return EINVAL;
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if (oldstate != NULL) *oldstate = self->p_cancelstate;
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self->p_cancelstate = state;
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if (self->p_canceled &&
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self->p_cancelstate == PTHREAD_CANCEL_ENABLE &&
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self->p_canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
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pthread_exit(PTHREAD_CANCELED);
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return 0;
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}
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int pthread_setcanceltype(int type, int * oldtype)
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{
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pthread_descr self = thread_self();
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if (type < PTHREAD_CANCEL_DEFERRED || type > PTHREAD_CANCEL_ASYNCHRONOUS)
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return EINVAL;
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if (oldtype != NULL) *oldtype = self->p_canceltype;
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self->p_canceltype = type;
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if (self->p_canceled &&
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self->p_cancelstate == PTHREAD_CANCEL_ENABLE &&
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self->p_canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
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pthread_exit(PTHREAD_CANCELED);
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return 0;
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}
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int pthread_cancel(pthread_t thread)
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{
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pthread_handle handle = thread_handle(thread);
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int pid;
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acquire(&handle->h_spinlock);
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if (invalid_handle(handle, thread)) {
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release(&handle->h_spinlock);
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return ESRCH;
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}
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handle->h_descr->p_canceled = 1;
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pid = handle->h_descr->p_pid;
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release(&handle->h_spinlock);
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kill(pid, PTHREAD_SIG_CANCEL);
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return 0;
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}
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void pthread_testcancel(void)
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{
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pthread_descr self = thread_self();
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if (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE)
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pthread_exit(PTHREAD_CANCELED);
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}
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void _pthread_cleanup_push(struct _pthread_cleanup_buffer * buffer,
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void (*routine)(void *), void * arg)
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{
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pthread_descr self = thread_self();
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buffer->routine = routine;
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buffer->arg = arg;
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buffer->prev = self->p_cleanup;
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self->p_cleanup = buffer;
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}
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void _pthread_cleanup_pop(struct _pthread_cleanup_buffer * buffer,
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int execute)
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{
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pthread_descr self = thread_self();
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if (execute) buffer->routine(buffer->arg);
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self->p_cleanup = buffer->prev;
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}
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void _pthread_cleanup_push_defer(struct _pthread_cleanup_buffer * buffer,
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void (*routine)(void *), void * arg)
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{
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pthread_descr self = thread_self();
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buffer->routine = routine;
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buffer->arg = arg;
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buffer->canceltype = self->p_canceltype;
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buffer->prev = self->p_cleanup;
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self->p_canceltype = PTHREAD_CANCEL_DEFERRED;
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self->p_cleanup = buffer;
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}
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void _pthread_cleanup_pop_restore(struct _pthread_cleanup_buffer * buffer,
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int execute)
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{
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pthread_descr self = thread_self();
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if (execute) buffer->routine(buffer->arg);
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self->p_cleanup = buffer->prev;
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self->p_canceltype = buffer->canceltype;
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if (self->p_canceled &&
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self->p_cancelstate == PTHREAD_CANCEL_ENABLE &&
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self->p_canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
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pthread_exit(PTHREAD_CANCELED);
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}
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void __pthread_perform_cleanup(void)
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{
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pthread_descr self = thread_self();
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struct _pthread_cleanup_buffer * c;
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for (c = self->p_cleanup; c != NULL; c = c->prev) c->routine(c->arg);
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}
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#ifndef PIC
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/* We need a hook to force the cancelation wrappers to be linked in when
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static libpthread is used. */
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extern const int __pthread_provide_wrappers;
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static const int * const __pthread_require_wrappers =
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&__pthread_provide_wrappers;
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#endif
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