80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/****************************************************************************
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* libs/libc/pthread/pthread_condinit.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 <pthread.h>
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#include <semaphore.h>
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#include <debug.h>
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#include <errno.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_cond_init
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*
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* Description:
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* A thread can create condition variables.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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int pthread_cond_init(FAR pthread_cond_t *cond,
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FAR const pthread_condattr_t *attr)
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{
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int ret = OK;
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sinfo("cond=%p attr=%p\n", cond, attr);
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if (cond == NULL)
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{
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ret = EINVAL;
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}
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/* Initialize the semaphore contained in the condition structure with
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* initial count = 0
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*/
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else if (sem_init(&cond->sem, 0, 0) != OK)
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{
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ret = get_errno();
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}
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else
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{
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cond->clockid = attr ? attr->clockid : CLOCK_REALTIME;
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}
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sinfo("Returning %d\n", ret);
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return ret;
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}
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