forked from Archive/PX4-Autopilot
112 lines
4.6 KiB
C
112 lines
4.6 KiB
C
/********************************************************************************
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* lib/pthread/pthread_barrierattrsetpshared.c
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*
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* Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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* 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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* Global Variables
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********************************************************************************/
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/********************************************************************************
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* Private Variables
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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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* Function: pthread_barrierattr_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 a
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* barrier to be operated upon by any thread that has access to the memory where
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* the barrier is allocated. If the process-shared attribute is
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* PTHREAD_PROCESS_PRIVATE, the barrier can only be operated upon by threads
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* created within the same process as the thread that initialized the barrier.
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* If threads of different processes attempt to operate on such a barrier, the
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* 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 defined
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* in pthread.h.
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*
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* Parameters:
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* attr - barrier attributes to be modified.
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* pshared - the new value of the pshared attribute.
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*
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* Return Value:
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* 0 (OK) on success or EINVAL if either attr is invalid or pshared is not one
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* 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_barrierattr_setpshared(FAR pthread_barrierattr_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 && 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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