104 lines
4.2 KiB
C
104 lines
4.2 KiB
C
/****************************************************************************
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* libc/pthread/pthread_barrieinit.c
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*
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* Copyright (C) 2007, 2009, 2017 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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* 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
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* use the barrier referenced by 'barrier' and initialized the barrier
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* with the attributes referenced by attr. If attr is NULL, the default
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* barrier attributes will be used. The results are undefined if
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* pthread_barrier_init() is called when any thread is blocked on the
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* barrier. The results are undefined if a barrier is used without first
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* being initialized. The results are undefined if pthread_barrier_init()
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* is called specifying an already initialized barrier.
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*
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* Input 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
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* argument specifies the number of threads that must call
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* pthread_barrier_wait() before any of them successfully return from
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* the call. The value specified by count must be greater than zero.
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*
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* Returned 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
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* barrier. EINVAL The barrier reference is invalid, or the values
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* specified by attr are invalid, or the value specified by count
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* 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
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* barrier 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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