622455d762
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4940 42af7a65-404d-4744-a932-0658087f49c3
123 lines
5.2 KiB
C
123 lines
5.2 KiB
C
/********************************************************************************
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* sched/pthread_barrieinit.c
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*
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* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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********************************************************************************/
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/********************************************************************************
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* Included Files
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********************************************************************************/
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#include <nuttx/config.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include <errno.h>
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#include <debug.h>
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/********************************************************************************
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* Definitions
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********************************************************************************/
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/********************************************************************************
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* Private Type Declarations
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********************************************************************************/
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/********************************************************************************
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* Global Variables
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********************************************************************************/
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/********************************************************************************
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* Private Variables
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********************************************************************************/
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/********************************************************************************
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* Private Function Prototypes
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********************************************************************************/
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/********************************************************************************
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* Public Functions
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********************************************************************************/
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/********************************************************************************
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* Name: pthread_barrier_init
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*
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* Description:
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* The pthread_barrier_init() function allocates any resources required to use
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* the barrier referenced by 'barrier' and initialized the barrier with the
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* attributes referenced by attr. If attr is NULL, the default barrier
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* attributes will be used. The results are undefined if pthread_barrier_init()
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* is called when any thread is blocked on the barrier. The results are
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* undefined if a barrier is used without first being initialized. The results
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* are undefined if pthread_barrier_init() is called specifying an already
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* initialized barrier.
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*
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* Parameters:
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* barrier - the barrier to be initialized
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* attr - barrier attributes to be used in the initialization.
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* count - the count to be associated with the barrier. The count argument
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* specifies the number of threads that must call pthread_barrier_wait() before
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* any of them successfully return from the call. The value specified by
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* count must be greater than zero.
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*
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* Return Value:
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* 0 (OK) on success or on of the following error numbers:
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*
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* EAGAIN The system lacks the necessary resources to initialize another barrier.
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* EINVAL The barrier reference is invalid, or the values specified by attr are
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* invalid, or the value specified by count is equal to zero.
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* ENOMEM Insufficient memory exists to initialize the barrier.
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* EBUSY The implementation has detected an attempt to reinitialize a barrier
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* while it is in use.
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*
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* Assumptions:
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*
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********************************************************************************/
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int pthread_barrier_init(FAR pthread_barrier_t *barrier,
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FAR const pthread_barrierattr_t *attr, unsigned int count)
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{
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int ret = OK;
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if (!barrier || count == 0)
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{
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ret = EINVAL;
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}
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else
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{
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sem_init(&barrier->sem, 0, 0);
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barrier->count = count;
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}
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return ret;
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}
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