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