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Diffstat (limited to 'nuttx/sched/pthread_mutexlock.c')
| -rw-r--r-- | nuttx/sched/pthread_mutexlock.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/nuttx/sched/pthread_mutexlock.c b/nuttx/sched/pthread_mutexlock.c deleted file mode 100644 index 7681d771a..000000000 --- a/nuttx/sched/pthread_mutexlock.c +++ /dev/null @@ -1,187 +0,0 @@ -/**************************************************************************** - * sched/pthread_mutexlock.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_lock - * - * Description: - * The mutex object referenced by mutex is locked by calling - * pthread_mutex_lock(). If the mutex is already locked, the calling thread - * blocks until the mutex becomes available. This operation returns with the - * mutex object referenced by mutex in the locked state with the calling - * thread as its owner. - * - * If the mutex type is PTHREAD_MUTEX_NORMAL, deadlock detection is not - * provided. Attempting to relock the mutex causes deadlock. If a thread - * attempts to unlock a mutex that it has not locked or a mutex which is - * unlocked, undefined behavior results. - * - * If the mutex type is PTHREAD_MUTEX_ERRORCHECK, then error checking is - * provided. If a thread attempts to relock a mutex that it has already - * locked, an error will be returned. If a thread attempts to unlock a - * mutex that it has not locked or a mutex which is unlocked, an error will - * be returned. - * - * If the mutex type is PTHREAD_MUTEX_RECURSIVE, then the mutex maintains - * the concept of a lock count. When a thread successfully acquires a mutex - * for the first time, the lock count is set to one. Every time a thread - * relocks this mutex, the lock count is incremented by one. Each time the - * thread unlocks the mutex, the lock count is decremented by one. When the - * lock count reaches zero, the mutex becomes available for other threads to - * acquire. If a thread attempts to unlock a mutex that it has not locked or - * a mutex which is unlocked, an error will be returned. - * - * 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: - * mutex - A reference to the mutex to be locked. - * - * Return Value: - * 0 on success or an errno value on failure. Note that the errno EINTR - * is never returned by pthread_mutex_lock(). - * - * Assumptions: - * - ****************************************************************************/ - -int pthread_mutex_lock(FAR pthread_mutex_t *mutex) -{ - int mypid = (int)getpid(); - 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 this task already hold the semaphore? */ - - if (mutex->pid == mypid) - { - /* Yes.. Is this a recursive mutex? */ - -#ifdef CONFIG_MUTEX_TYPES - if (mutex->type == PTHREAD_MUTEX_RECURSIVE) - { - /* Yes... just increment the number of locks held and return success */ - - mutex->nlocks++; - } - else -#endif - { - /* No, then we would deadlock... return an error (default behavior - * is like PTHREAD_MUTEX_ERRORCHECK) - */ - - sdbg("Returning EDEADLK\n"); - ret = EDEADLK; - } - } - else - { - /* Take the semaphore */ - - ret = pthread_takesemaphore((sem_t*)&mutex->sem); - - /* If we succussfully obtained the semaphore, then indicate - * that we own it. - */ - - if (!ret) - { - mutex->pid = mypid; -#ifdef CONFIG_MUTEX_TYPES - mutex->nlocks = 1; -#endif - } - } - - sched_unlock(); - } - - sdbg("Returning %d\n", ret); - return ret; -} - |