1 files changed, 122 insertions, 0 deletions
diff --git a/lib/libpthread/thread/thr_barrier.c b/lib/libpthread/thread/thr_barrier.c
new file mode 100644
index 0000000..612acb1
--- /dev/null
+++ b/lib/libpthread/thread/thr_barrier.c
@@ -0,0 +1,122 @@
+/*-
+ * Copyright (c) 2003 David Xu <davidxu@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include "namespace.h"
+#include <pthread.h>
+#include "un-namespace.h"
+#include "thr_private.h"
+
+__weak_reference(_pthread_barrier_init,		pthread_barrier_init);
+__weak_reference(_pthread_barrier_wait,		pthread_barrier_wait);
+__weak_reference(_pthread_barrier_destroy,	pthread_barrier_destroy);
+
+int
+_pthread_barrier_destroy(pthread_barrier_t *barrier)
+{
+	pthread_barrier_t	bar;
+	int			ret, ret2;
+
+	if (barrier == NULL || *barrier == NULL)
+		return (EINVAL);
+
+	bar = *barrier;
+	if (bar->b_waiters > 0)
+		return (EBUSY);
+	*barrier = NULL;
+	ret  = _pthread_mutex_destroy(&bar->b_lock);
+	ret2 = _pthread_cond_destroy(&bar->b_cond);
+	free(bar);
+	return (ret ? ret : ret2);
+}
+
+int
+_pthread_barrier_init(pthread_barrier_t *barrier,
+		      const pthread_barrierattr_t *attr, int count)
+{
+	pthread_barrier_t	bar;
+	int			ret;
+
+	if (barrier == NULL || count <= 0)
+		return (EINVAL);
+
+	bar = malloc(sizeof(struct pthread_barrier));
+	if (bar == NULL)
+		return (ENOMEM);
+
+	if ((ret = _pthread_mutex_init(&bar->b_lock, NULL)) != 0) {
+		free(bar);
+		return (ret);
+	}
+
+	if ((ret = _pthread_cond_init(&bar->b_cond, NULL)) != 0) {
+		_pthread_mutex_destroy(&bar->b_lock);
+		free(bar);
+		return (ret);
+	}
+
+	bar->b_waiters		= 0;
+	bar->b_count		= count;
+	bar->b_generation	= 0;
+	*barrier		= bar;
+
+	return (0);
+}
+
+int
+_pthread_barrier_wait(pthread_barrier_t *barrier)
+{
+	int ret, gen;
+	pthread_barrier_t bar;
+
+	if (barrier == NULL || *barrier == NULL)
+		return (EINVAL);
+
+	bar = *barrier;
+	if ((ret = _pthread_mutex_lock(&bar->b_lock)) != 0)
+		return (ret);
+
+	if (++bar->b_waiters == bar->b_count) {
+		/* Current thread is lastest thread */
+		bar->b_generation++;
+		bar->b_waiters = 0;
+		ret = _pthread_cond_broadcast(&bar->b_cond);
+		if (ret == 0)
+			ret = PTHREAD_BARRIER_SERIAL_THREAD;
+	} else {
+		gen = bar->b_generation;
+		do {
+			ret = _pthread_cond_wait(
+				&bar->b_cond, &bar->b_lock);
+		/* test generation to avoid bogus wakeup */
+		} while (ret == 0 && gen == bar->b_generation);
+	}
+	_pthread_mutex_unlock(&bar->b_lock);
+	return (ret);
+}