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/* Signal a condition. Generic version.
Copyright (C) 2000-2021 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 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, see
<https://www.gnu.org/licenses/>. */
#include <pthread.h>
#include <pt-internal.h>
/* Unblock at least one of the threads that are blocked on condition
variable COND. */
int
__pthread_cond_signal (pthread_cond_t *cond)
{
struct __pthread *wakeup;
__pthread_spin_wait (&cond->__lock);
wakeup = cond->__queue;
if (wakeup != NULL)
__pthread_dequeue (wakeup);
__pthread_spin_unlock (&cond->__lock);
if (wakeup != NULL)
__pthread_wakeup (wakeup);
return 0;
}
weak_alias (__pthread_cond_signal, pthread_cond_signal);
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