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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-02-17 23:21:28 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-02-17 23:21:28 +0000 |
commit | e3940eb2080711edac189cca3f642ee89dc215f2 (patch) | |
tree | 1c390958fae49e34dce698b175487e6d4681e540 /nuttx/sched/pthread_mutexinit.c | |
parent | 2223612deb2cc6322992f8595b6d6f86fcb53ae1 (diff) | |
download | px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.tar.gz px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.tar.bz2 px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.zip |
NuttX RTOS
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/sched/pthread_mutexinit.c')
-rw-r--r-- | nuttx/sched/pthread_mutexinit.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/nuttx/sched/pthread_mutexinit.c b/nuttx/sched/pthread_mutexinit.c new file mode 100644 index 000000000..faa06f227 --- /dev/null +++ b/nuttx/sched/pthread_mutexinit.c @@ -0,0 +1,122 @@ +/************************************************************ + * pthread_mutexinit.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 Gregory Nutt 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 <sys/types.h> +#include <pthread.h> +#include <errno.h> +#include <debug.h> +#include "pthread_internal.h" + +/************************************************************ + * Definitions + ************************************************************/ + +/************************************************************ + * Private Type Declarations + ************************************************************/ + +/************************************************************ + * Global Variables + ************************************************************/ + +/************************************************************ + * Private Variables + ************************************************************/ + +/************************************************************ + * Private Functions + ************************************************************/ + +/************************************************************ + * Public Functions + ************************************************************/ + +/************************************************************ + * Function: pthread_mutex_init + * + * Description: + * Create a mutex + * + * Parameters: + * None + * + * Return Value: + * None + * + * Assumptions: + * + ************************************************************/ + +int pthread_mutex_init(pthread_mutex_t *mutex, pthread_mutexattr_t *attr) +{ + int ret = OK; + int pshared = 0; + int status; + + dbg("%s: mutex=0x%p attr=0x%p\n", __FUNCTION__, mutex, attr); + + if (!mutex) + { + ret = EINVAL; + } + else + { + /* Were attributes specified? If so, use them */ + + if (attr) + { + pshared = attr->pshared; + } + + /* Indicate that the semaphore is not held by any thread. */ + + mutex->pid = 0; + + /* Initialize the mutex like a semaphore with initial count = 1 */ + + status = sem_init((sem_t*)&mutex->sem, pshared, 1); + if (status != OK) + { + ret = EINVAL; + } + } + + dbg("%s: Returning %d\n", __FUNCTION__, ret); + return ret; +} |