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122 lines
5.2 KiB
122 lines
5.2 KiB
/******************************************************************************** |
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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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