diff options
Diffstat (limited to 'nuttx/sched/pthread_mutextrylock.c')
-rw-r--r-- | nuttx/sched/pthread_mutextrylock.c | 147 |
1 files changed, 0 insertions, 147 deletions
diff --git a/nuttx/sched/pthread_mutextrylock.c b/nuttx/sched/pthread_mutextrylock.c deleted file mode 100644 index d88012b51..000000000 --- a/nuttx/sched/pthread_mutextrylock.c +++ /dev/null @@ -1,147 +0,0 @@ -/**************************************************************************** - * sched/pthread_mutextrylock.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 <semaphore.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_trylock - * - * Description: - * The function pthread_mutex_trylock() is identical to pthread_mutex_lock() - * except that if the mutex object referenced by mutex is currently locked - * (by any thread, including the current thread), the call returns immediately - * with the errno EBUSY. - * - * 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_trylock(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(); - - /* Try to get the semaphore. */ - - if (sem_trywait((sem_t*)&mutex->sem) == OK) - { - /* If we succussfully obtained the semaphore, then indicate - * that we own it. - */ - - mutex->pid = (int)getpid(); - } - - /* Was it not available? */ - - else if (get_errno() == EAGAIN) - { - ret = EBUSY; - } - else - { - ret = EINVAL; - } - - sched_unlock(); - } - - sdbg("Returning %d\n", ret); - return ret; -} - - - |