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