69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
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/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <errno.h>
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#include "pthread_accessor.h"
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int pthread_join(pthread_t t, void ** ret_val) {
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if (t == pthread_self()) {
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return EDEADLK;
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}
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pthread_accessor thread(t);
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if (thread.get() == NULL) {
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return ESRCH;
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}
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if (thread->attr.flags & PTHREAD_ATTR_FLAG_DETACHED) {
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return EINVAL;
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}
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// Wait for thread death when needed.
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// If the 'join_count' is negative, this is a 'zombie' thread that
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// is already dead and without stack/TLS. Otherwise, we need to increment 'join-count'
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// and wait to be signaled
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int count = thread->join_count;
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if (count >= 0) {
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thread->join_count += 1;
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pthread_cond_wait(&thread->join_cond, &gThreadListLock);
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count = --thread->join_count;
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}
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if (ret_val) {
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*ret_val = thread->return_value;
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}
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// Remove thread from thread list when we're the last joiner or when the
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// thread was already a zombie.
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if (count <= 0) {
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_pthread_internal_remove_locked(thread.get());
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}
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return 0;
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}
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