106 lines
3.9 KiB
C
106 lines
3.9 KiB
C
/****************************************************************************
|
|
* sched/pthread/pthread_setaffinity.c
|
|
*
|
|
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <pthread.h>
|
|
#include <sched.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include "pthread/pthread.h"
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: pthread_setaffinity
|
|
*
|
|
* Description:
|
|
* The pthread_setaffinity_np() function sets the CPU affinity mask of
|
|
* the thread thread to the CPU set pointed to by cpuset. If the call
|
|
* is successful, and the thread is not currently running on one of the
|
|
* CPUs in cpuset, then it is migrated to one of those CPUs.
|
|
|
|
* The argument cpusetsize is the length (in bytes) of the buffer
|
|
* pointed to by cpuset. Typically, this argument would be specified as
|
|
* sizeof(cpu_set_t).
|
|
*
|
|
* Parameters:
|
|
* thread - The ID of thread whose affinity set will be modified.
|
|
* cpusetsize - Size of cpuset. MUST be sizeofcpu_set_t().
|
|
* cpuset - Provides the new affinity set for the thread.
|
|
*
|
|
* Return Value:
|
|
* 0 if successful. Otherwise, an errno value is returned indicating the
|
|
* nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int pthread_setaffinity_np(pthread_t thread, size_t cpusetsize,
|
|
FAR const cpu_set_t *cpuset)
|
|
{
|
|
int ret;
|
|
|
|
sdbg("thread ID=%d cpusetsize=%d cpuset=%p\n",
|
|
(int)thread, (int)cpusetsize, cpusetsize);
|
|
|
|
DEBUGASSERT(thread > 0 && cpusetsize == sizeof(cpu_set_t) &&
|
|
cpuset != NULL);
|
|
|
|
/* Let sched_setaffinity do all of the work */
|
|
|
|
ret = sched_setaffinity((pid_t)thread, cpusetsize, cpuset);
|
|
if (ret < 0)
|
|
{
|
|
/* If sched_setaffinity() fails, return the errno */
|
|
|
|
ret = get_errno();
|
|
DEBUGASSERT(ret > 0);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|