19e246dda6
If pthread_detach() is called while the thread is in pthread_exit(), it takes the risk that no one can free the pthread_internal_t. So I add PTHREAD_ATTR_FLAG_ZOMBIE to detect this, maybe very rare, but both glibc and netbsd libpthread have similar function. Change-Id: Iaa15f651903b8ca07aaa7bd4de46ff14a2f93835
59 lines
2.1 KiB
C++
59 lines
2.1 KiB
C++
/*
|
|
* 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.h>
|
|
|
|
#include "pthread_accessor.h"
|
|
|
|
int pthread_detach(pthread_t t) {
|
|
{
|
|
pthread_accessor thread(t);
|
|
if (thread.get() == NULL) {
|
|
return ESRCH;
|
|
}
|
|
|
|
if (thread->attr.flags & PTHREAD_ATTR_FLAG_DETACHED) {
|
|
return EINVAL; // Already detached.
|
|
}
|
|
|
|
if (thread->attr.flags & PTHREAD_ATTR_FLAG_JOINED) {
|
|
return 0; // Already being joined; silently do nothing, like glibc.
|
|
}
|
|
|
|
// If the thread has not exited, we can detach it safely.
|
|
if ((thread->attr.flags & PTHREAD_ATTR_FLAG_ZOMBIE) == 0) {
|
|
thread->attr.flags |= PTHREAD_ATTR_FLAG_DETACHED;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// The thread is in zombie state, use pthread_join to clean it up.
|
|
return pthread_join(t, NULL);
|
|
}
|