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/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include "pthreadP.h"
int
__pthread_cond_destroy (cond)
pthread_cond_t *cond;
{
/* Make sure we are alone. */
lll_mutex_lock (cond->__data.__lock);
if (cond->__data.__total_seq > cond->__data.__wakeup_seq)
{
/* If there are still some waiters which have not been
woken up, this is an application bug. */
lll_mutex_unlock (cond->__data.__lock);
return EBUSY;
}
/* Tell pthread_cond_*wait that this condvar is being destroyed. */
cond->__data.__total_seq = -1ULL;
/* If there are waiters which have been already signalled or
broadcasted, but still are using the pthread_cond_t structure,
pthread_cond_destroy needs to wait for them. */
unsigned int nwaiters = cond->__data.__nwaiters;
while (nwaiters >= (1 << COND_CLOCK_BITS))
{
lll_mutex_unlock (cond->__data.__lock);
lll_futex_wait (&cond->__data.__nwaiters, nwaiters);
lll_mutex_lock (cond->__data.__lock);
nwaiters = cond->__data.__nwaiters;
}
return 0;
}
weak_alias(__pthread_cond_destroy, pthread_cond_destroy)
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