diff options
Diffstat (limited to 'nuttx/sched/pthread_mutexunlock.c')
| -rw-r--r-- | nuttx/sched/pthread_mutexunlock.c | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/nuttx/sched/pthread_mutexunlock.c b/nuttx/sched/pthread_mutexunlock.c deleted file mode 100644 index 34846f952..000000000 --- a/nuttx/sched/pthread_mutexunlock.c +++ /dev/null @@ -1,164 +0,0 @@ -/**************************************************************************** - * sched/pthread_mutexunlock.c - * - * Copyright (C) 2007-2009 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * 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 <nuttx/config.h> - -#include <unistd.h> -#include <pthread.h> -#include <sched.h> -#include <errno.h> -#include <debug.h> - -#include "pthread_internal.h" - -/**************************************************************************** - * Definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Type Declarations - ****************************************************************************/ - -/**************************************************************************** - * Global Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: pthread_mutex_unlock - * - * Description: - * The pthread_mutex_unlock() function releases the mutex object referenced - * by mutex. The manner in which a mutex is released is dependent upon the - * mutex's type attribute. If there are threads blocked on the mutex object - * referenced by mutex when pthread_mutex_unlock() is called, resulting in - * the mutex becoming available, the scheduling policy is used to determine - * which thread shall acquire the mutex. (In the case of PTHREAD_MUTEX_RECURSIVE - * mutexes, the mutex becomes available when the count reaches zero and the - * calling thread no longer has any locks on this mutex). - * - * If a signal is delivered to a thread waiting for a mutex, upon return from - * the signal handler the thread resumes waiting for the mutex as if it was - * not interrupted. - * - * Parameters: - * None - * - * Return Value: - * None - * - * Assumptions: - * - ****************************************************************************/ - -int pthread_mutex_unlock(FAR pthread_mutex_t *mutex) -{ - int ret = OK; - - sdbg("mutex=0x%p\n", mutex); - - if (!mutex) - { - ret = EINVAL; - } - else - { - /* Make sure the semaphore is stable while we make the following - * checks. This all needs to be one atomic action. - */ - - sched_lock(); - - /* Does the calling thread own the semaphore? */ - - if (mutex->pid != (int)getpid()) - { - /* No... return an error (default behavior is like PTHREAD_MUTEX_ERRORCHECK) */ - - sdbg("Holder=%d returning EPERM\n", mutex->pid); - ret = EPERM; - } - - - /* Yes, the caller owns the semaphore.. Is this a recursive mutex? */ - -#ifdef CONFIG_MUTEX_TYPES - else if (mutex->type == PTHREAD_MUTEX_RECURSIVE && mutex->nlocks > 1) - { - /* This is a recursive mutex and we there are multiple locks held. Retain - * the mutex lock, just decrement the count of locks held, and return - * success. - */ - mutex->nlocks--; - } -#endif - - /* This is either a non-recursive mutex or is the outermost unlock of - * a recursive mutex. - */ - - else - { - /* Nullify the pid and lock count then post the semaphore */ - - mutex->pid = 0; -#ifdef CONFIG_MUTEX_TYPES - mutex->nlocks = 0; -#endif - ret = pthread_givesemaphore((sem_t*)&mutex->sem); - } - sched_unlock(); - } - - sdbg("Returning %d\n", ret); - return ret; -} - - |