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/* Detach a thread.
Copyright (C) 2000, 2005 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,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <pthread.h>
#include <stddef.h>
#include <pt-internal.h>
/* Indicate that the storage for THREAD can be reclaimed when it
terminates. */
int
pthread_detach (pthread_t thread)
{
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);
switch (pthread->state)
{
case PTHREAD_JOINABLE:
/* THREAD still running. Mark it as detached such that its
resources can be reclaimed as soon as the thread exits. */
pthread->state = PTHREAD_DETACHED;
/* Broadcast the condition. This will make threads that are
waiting to join THREAD continue with hopefully disastrous
consequences instead of blocking indefinitely. */
pthread_cond_broadcast (&pthread->state_cond);
__pthread_mutex_unlock (&pthread->state_lock);
break;
case PTHREAD_EXITED:
/* THREAD has already exited. Make sure that nobody can
reference it anymore, and mark it as terminated. */
__pthread_mutex_unlock (&pthread->state_lock);
/* Make sure the thread is not running before we remove its
stack. (The only possibility is that it is in a call to
__pthread_thread_halt itself, but that is enough to cause a
sigsegv.) */
__pthread_thread_halt (pthread);
/* Destroy the stack, the kernel resources and the control
block. */
assert (pthread->stack);
__pthread_stack_dealloc (pthread->stackaddr, pthread->stacksize);
pthread->stack = 0;
__pthread_thread_dealloc (pthread);
__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 detach non-joinable threads! */
__pthread_mutex_unlock (&pthread->state_lock);
err = EINVAL;
break;
}
return err;
}
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