113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/* Thread termination.
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Copyright (C) 2000-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <errno.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <pt-internal.h>
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#include <pthreadP.h>
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#include <atomic.h>
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/* Terminate the current thread and make STATUS available to any
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thread that might join it. */
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void
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__pthread_exit (void *status)
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{
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struct __pthread *self = _pthread_self ();
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struct __pthread_cancelation_handler **handlers;
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int oldstate;
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/* Run any cancelation handlers. According to POSIX, the
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cancellation cleanup handlers should be called with cancellation
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disabled. */
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__pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);
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for (handlers = __pthread_get_cleanup_stack ();
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*handlers != NULL;
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*handlers = (*handlers)->__next)
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(*handlers)->__handler ((*handlers)->__arg);
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__pthread_setcancelstate (oldstate, &oldstate);
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/* Decrease the number of threads. We use an atomic operation to
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make sure that only the last thread calls `exit'. */
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if (atomic_fetch_add_relaxed (&__pthread_total, -1) == 1)
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/* We are the last thread. */
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exit (0);
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/* Destroy any thread specific data. */
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__pthread_destroy_specific (self);
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/* Note that after this point the process can be terminated at any
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point if another thread calls `pthread_exit' and happens to be
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the last thread. */
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__pthread_mutex_lock (&self->state_lock);
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if (self->cancel_state == PTHREAD_CANCEL_ENABLE && self->cancel_pending)
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status = PTHREAD_CANCELED;
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switch (self->state)
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{
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default:
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assert (!"Consistency error: unexpected self->state");
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abort ();
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break;
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case PTHREAD_DETACHED:
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__pthread_mutex_unlock (&self->state_lock);
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break;
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case PTHREAD_JOINABLE:
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/* We need to stay around for a while since another thread
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might want to join us. */
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self->state = PTHREAD_EXITED;
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/* We need to remember the exit status. A thread joining us
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might ask for it. */
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self->status = status;
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/* Broadcast the condition. This will wake up threads that are
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waiting to join us. */
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__pthread_cond_broadcast (&self->state_cond);
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__pthread_mutex_unlock (&self->state_lock);
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break;
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}
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/* Destroy any signal state. */
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__pthread_sigstate_destroy (self);
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/* Self terminating requires TLS, so defer the release of the TCB until
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the thread structure is reused. */
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/* Release kernel resources, including the kernel thread and the stack,
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and drop the self reference. */
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__pthread_thread_terminate (self);
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/* NOTREACHED */
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abort ();
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}
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weak_alias (__pthread_exit, pthread_exit);
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