mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 05:00:15 +00:00
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/* pthread_barrier_wait. Generic version.
|
|
Copyright (C) 2002-2024 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 <assert.h>
|
|
|
|
#include <pt-internal.h>
|
|
|
|
int
|
|
pthread_barrier_wait (pthread_barrier_t *barrier)
|
|
{
|
|
__pthread_spin_wait (&barrier->__lock);
|
|
if (--barrier->__pending == 0)
|
|
{
|
|
barrier->__pending = barrier->__count;
|
|
|
|
if (barrier->__count == 1)
|
|
__pthread_spin_unlock (&barrier->__lock);
|
|
else
|
|
{
|
|
struct __pthread *wakeup;
|
|
unsigned n = 0;
|
|
|
|
__pthread_queue_iterate (barrier->__queue, wakeup)
|
|
n++;
|
|
|
|
{
|
|
struct __pthread *wakeups[n];
|
|
unsigned i = 0;
|
|
|
|
__pthread_dequeuing_iterate (barrier->__queue, wakeup)
|
|
wakeups[i++] = wakeup;
|
|
|
|
barrier->__queue = NULL;
|
|
__pthread_spin_unlock (&barrier->__lock);
|
|
|
|
for (i = 0; i < n; i++)
|
|
__pthread_wakeup (wakeups[i]);
|
|
}
|
|
}
|
|
|
|
return PTHREAD_BARRIER_SERIAL_THREAD;
|
|
}
|
|
else
|
|
{
|
|
struct __pthread *self = _pthread_self ();
|
|
|
|
/* Add ourselves to the list of waiters. */
|
|
__pthread_enqueue (&barrier->__queue, self);
|
|
__pthread_spin_unlock (&barrier->__lock);
|
|
|
|
__pthread_block (self);
|
|
return 0;
|
|
}
|
|
}
|