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138 lines
4.4 KiB
138 lines
4.4 KiB
/**************************************************************************** |
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* sched/pthread_mutexinit.c |
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* |
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* Copyright (C) 2007-2009, 2011 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 <stdint.h> |
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#include <pthread.h> |
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#include <errno.h> |
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#include <debug.h> |
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#include "pthread_internal.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 Functions |
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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_mutex_init |
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* |
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* Description: |
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* Create a mutex |
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* |
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* Parameters: |
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* None |
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* |
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* Return Value: |
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* None |
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* |
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* Assumptions: |
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* |
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****************************************************************************/ |
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int pthread_mutex_init(FAR pthread_mutex_t *mutex, FAR pthread_mutexattr_t *attr) |
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{ |
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int pshared = 0; |
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#ifdef CONFIG_MUTEX_TYPES |
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uint8_t type = PTHREAD_MUTEX_DEFAULT; |
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#endif |
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int ret = OK; |
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int status; |
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sdbg("mutex=0x%p attr=0x%p\n", mutex, attr); |
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if (!mutex) |
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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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/* Were attributes specified? If so, use them */ |
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if (attr) |
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{ |
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pshared = attr->pshared; |
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#ifdef CONFIG_MUTEX_TYPES |
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type = attr->type; |
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#endif |
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} |
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/* Indicate that the semaphore is not held by any thread. */ |
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mutex->pid = 0; |
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/* Initialize the mutex like a semaphore with initial count = 1 */ |
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status = sem_init((sem_t*)&mutex->sem, pshared, 1); |
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if (status != OK) |
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{ |
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ret = EINVAL; |
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} |
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/* Set up attributes unique to the mutex type */ |
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#ifdef CONFIG_MUTEX_TYPES |
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mutex->type = type; |
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mutex->nlocks = 0; |
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#endif |
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} |
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sdbg("Returning %d\n", ret); |
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return ret; |
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}
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