/**************************************************************************** * sched/pthread/pthread_barrieinit.c * * Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include /**************************************************************************** * 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; }