106 lines
3.9 KiB
C
106 lines
3.9 KiB
C
/****************************************************************************
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* sched/pthread/pthread_setaffinity.c
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*
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* Copyright (C) 2016 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 <sys/types.h>
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#include <pthread.h>
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#include <sched.h>
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#include <errno.h>
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#include <debug.h>
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#include "pthread/pthread.h"
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#ifdef CONFIG_SMP
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pthread_setaffinity
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*
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* Description:
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* The pthread_setaffinity_np() function sets the CPU affinity mask of
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* the thread thread to the CPU set pointed to by cpuset. If the call
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* is successful, and the thread is not currently running on one of the
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* CPUs in cpuset, then it is migrated to one of those CPUs.
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* The argument cpusetsize is the length (in bytes) of the buffer
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* pointed to by cpuset. Typically, this argument would be specified as
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* sizeof(cpu_set_t).
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*
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* Parameters:
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* thread - The ID of thread whose affinity set will be modified.
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* cpusetsize - Size of cpuset. MUST be sizeofcpu_set_t().
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* cpuset - Provides the new affinity set for the thread.
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*
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* Return Value:
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* 0 if successful. Otherwise, an errno value is returned indicating the
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* nature of the failure.
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*
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****************************************************************************/
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int pthread_setaffinity_np(pthread_t thread, size_t cpusetsize,
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FAR const cpu_set_t *cpuset)
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{
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int ret;
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sinfo("thread ID=%d cpusetsize=%d cpuset=%p\n",
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(int)thread, (int)cpusetsize, cpusetsize);
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DEBUGASSERT(thread > 0 && cpusetsize == sizeof(cpu_set_t) &&
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cpuset != NULL);
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/* Let sched_setaffinity do all of the work */
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ret = sched_setaffinity((pid_t)thread, cpusetsize, cpuset);
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if (ret < 0)
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{
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/* If sched_setaffinity() fails, return the errno */
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ret = get_errno();
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DEBUGASSERT(ret > 0);
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}
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return ret;
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}
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#endif /* CONFIG_SMP */
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