123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/****************************************************************************
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* sched/pthread/pthread_initialize.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <stdbool.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/semaphore.h>
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#include "pthread/pthread.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pthread_sem_take, pthread_sem_trytake, and
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* pthread_sem_give
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*
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* Description:
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* Support managed access to the private data sets.
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*
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* REVISIT: These functions really do nothing more than match the return
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* value of the semaphore functions (0 or -1 with errno set) to the
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* return value of more pthread functions (0 or errno). A better solution
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* would be to use an internal version of the semaphore functions that
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* return the error value in the correct form.
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*
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* Input Parameters:
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* sem - The semaphore to lock or unlock
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*
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* Returned Value:
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* 0 on success or an errno value on failure.
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*
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****************************************************************************/
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int pthread_sem_take(FAR sem_t *sem, FAR const struct timespec *abs_timeout)
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{
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int ret;
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if (abs_timeout == NULL)
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{
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ret = nxsem_wait_uninterruptible(sem);
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}
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else
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{
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ret = nxsem_timedwait_uninterruptible(sem, abs_timeout);
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}
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return -ret;
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}
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#ifdef CONFIG_PTHREAD_MUTEX_UNSAFE
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int pthread_sem_trytake(FAR sem_t *sem)
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{
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int ret = EINVAL;
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/* Verify input parameters */
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DEBUGASSERT(sem != NULL);
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if (sem != NULL)
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{
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/* Try to take the semaphore */
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int status = nxsem_trywait(sem);
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ret = status < 0 ? -status : OK;
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}
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return ret;
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}
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#endif
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int pthread_sem_give(FAR sem_t *sem)
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{
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int ret;
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/* Verify input parameters */
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DEBUGASSERT(sem != NULL);
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if (sem != NULL)
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{
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/* Give the semaphore */
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ret = nxsem_post(sem);
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if (ret < 0)
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{
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return -ret;
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}
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return OK;
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}
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else
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{
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/* NULL semaphore pointer! */
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return EINVAL;
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}
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}
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