100 lines
3.7 KiB
C
100 lines
3.7 KiB
C
/****************************************************************************
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* libs/libc/pthread/pthread_condattr_setpshared.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 <errno.h>
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#include <debug.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pthread_condattr_setpshared
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*
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* Description:
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* The process-shared attribute is set to PTHREAD_PROCESS_SHARED to permit
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* a cond to be operated upon by any thread that has access to the
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* memory where the cond is allocated. If the process-shared attribute
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* is PTHREAD_PROCESS_PRIVATE, the cond can only be operated upon by
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* threads created within the same process as the thread that initialized
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* the cond.
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* If threads of different processes attempt to operate on such a cond,
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* the behavior is undefined. The default value of the attribute is
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* PTHREAD_PROCESS_PRIVATE.
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*
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* Both constants PTHREAD_PROCESS_SHARED and PTHREAD_PROCESS_PRIVATE are
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* defined in pthread.h.
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*
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* Input Parameters:
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* attr - cond attributes to be modified.
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* pshared - the new value of the pshared attribute.
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*
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* Returned Value:
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* 0 (OK) on success or EINVAL if either attr is invalid or pshared is not
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* one of PTHREAD_PROCESS_SHARED or PTHREAD_PROCESS_PRIVATE.
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*
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* Assumptions:
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*
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****************************************************************************/
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int pthread_condattr_setpshared(FAR pthread_condattr_t *attr, int pshared)
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{
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int ret = OK;
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if (!attr || (pshared != PTHREAD_PROCESS_SHARED &&
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pshared != PTHREAD_PROCESS_PRIVATE))
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{
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ret = EINVAL;
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}
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else
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{
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attr->pshared = pshared;
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}
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return ret;
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}
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