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/* Signal a condition. Generic version.
Copyright (C) 2000 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 <pthread.h>
#include <pt-internal.h>
static int
cond_signal (struct __pthread_cond *cond, int *unblocked)
{
struct __pthread *wakeup;
__pthread_spin_lock (&cond->__lock);
wakeup = cond->__queue;
if (wakeup)
__pthread_dequeue (wakeup);
__pthread_spin_unlock (&cond->__lock);
if (wakeup)
{
/* We found a thread waiting for the condition to be signalled.
Wake it up! */
__pthread_wakeup (wakeup);
*unblocked = 1;
}
return 0;
}
/* Unblock at least one of the threads that are blocked on condition
variable COND. */
int
pthread_cond_signal (pthread_cond_t *cond)
{
int unblocked = 0;
return cond_signal (cond, &unblocked);
}
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