mirror of git://sourceware.org/git/glibc.git
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
|
/* Wait for thread termination.
|
||
|
|
Copyright (C) 2000-2018 Free Software Foundation, Inc.
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
|
||
|
|
The GNU C Library is free software; you can redistribute it and/or
|
||
|
|
modify it under the terms of the GNU Library General Public License as
|
||
|
|
published by the Free Software Foundation; either version 2 of the
|
||
|
|
License, or (at your option) any later version.
|
||
|
|
|
||
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
Library General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Library General Public
|
||
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
||
|
|
not, see <http://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#include <errno.h>
|
||
|
|
#include <pthread.h>
|
||
|
|
#include <stddef.h>
|
||
|
|
|
||
|
|
#include <pt-internal.h>
|
||
|
|
|
||
|
|
/* Make calling thread wait for termination of thread THREAD. Return
|
||
|
|
the exit status of the thread in *STATUS. */
|
||
|
|
int
|
||
|
|
pthread_join (pthread_t thread, void **status)
|
||
|
|
{
|
||
|
|
struct __pthread *pthread;
|
||
|
|
int err = 0;
|
||
|
|
|
||
|
|
/* Lookup the thread structure for THREAD. */
|
||
|
|
pthread = __pthread_getid (thread);
|
||
|
|
if (pthread == NULL)
|
||
|
|
return ESRCH;
|
||
|
|
|
||
|
|
__pthread_mutex_lock (&pthread->state_lock);
|
||
|
|
pthread_cleanup_push ((void (*)(void *)) __pthread_mutex_unlock,
|
||
|
|
&pthread->state_lock);
|
||
|
|
|
||
|
|
/* Rely on pthread_cond_wait being a cancellation point to make
|
||
|
|
pthread_join one too. */
|
||
|
|
while (pthread->state == PTHREAD_JOINABLE)
|
||
|
|
__pthread_cond_wait (&pthread->state_cond, &pthread->state_lock);
|
||
|
|
|
||
|
|
pthread_cleanup_pop (0);
|
||
|
|
|
||
|
|
switch (pthread->state)
|
||
|
|
{
|
||
|
|
case PTHREAD_EXITED:
|
||
|
|
/* THREAD has already exited. Salvage its exit status. */
|
||
|
|
if (status != NULL)
|
||
|
|
*status = pthread->status;
|
||
|
|
|
||
|
|
__pthread_mutex_unlock (&pthread->state_lock);
|
||
|
|
|
||
|
|
__pthread_dealloc (pthread);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case PTHREAD_TERMINATED:
|
||
|
|
/* Pretend THREAD wasn't there in the first place. */
|
||
|
|
__pthread_mutex_unlock (&pthread->state_lock);
|
||
|
|
err = ESRCH;
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
/* Thou shalt not join non-joinable threads! */
|
||
|
|
__pthread_mutex_unlock (&pthread->state_lock);
|
||
|
|
err = EINVAL;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return err;
|
||
|
|
}
|