Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
2026-10-30 15:23:34 +08:00 · 2012-09-17 18:18:44 +00:00
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+/********************************************************************************
+ * sched/pthread_barrieinit.c
+ *
+ *   Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ *
+ ********************************************************************************/
+
+/********************************************************************************
+ * Included Files
+ ********************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <semaphore.h>
+#include <errno.h>
+#include <debug.h>
+
+/********************************************************************************
+ * Definitions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Type Declarations
+ ********************************************************************************/
+
+/********************************************************************************
+ * Global Variables
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Variables
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Function Prototypes
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Name: pthread_barrier_init
+ *
+ * Description:
+ *   The pthread_barrier_init() function allocates any resources required to use
+ *   the barrier referenced by 'barrier' and initialized the barrier with the
+ *   attributes referenced by attr.  If attr is NULL, the default barrier
+ *   attributes will be used. The results are undefined if pthread_barrier_init()
+ *   is called when any thread is blocked on the barrier. The results are
+ *   undefined if a barrier is used without first being initialized. The results
+ *   are undefined if pthread_barrier_init() is called specifying an already
+ *   initialized barrier.
+ *
+ * Parameters:
+ *   barrier - the barrier to be initialized
+ *   attr - barrier attributes to be used in the initialization.
+ *   count - the count to be associated with the barrier.  The count argument
+ *     specifies the number of threads that must call pthread_barrier_wait() before
+ *     any of them successfully return from the call.  The value specified by
+ *     count must be greater than zero.
+ *
+ * Return Value:
+ *   0 (OK) on success or on of the following error numbers:
+ *
+ *   EAGAIN The system lacks the necessary resources to initialize another barrier.
+ *   EINVAL The barrier reference is invalid, or the values specified by attr are
+ *          invalid, or the value specified by count is equal to zero.
+ *   ENOMEM Insufficient memory exists to initialize the barrier.
+ *   EBUSY  The implementation has detected an attempt to reinitialize a barrier
+ *          while it is in use.
+ *
+ * Assumptions:
+ *
+ ********************************************************************************/
+
+int pthread_barrier_init(FAR pthread_barrier_t *barrier,
+                         FAR const pthread_barrierattr_t *attr, unsigned int count)
+{
+  int ret = OK;
+
+  if (!barrier || count == 0)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      sem_init(&barrier->sem, 0, 0);
+      barrier->count = count;
+    }
+
+  return ret;
+}