92 lines
3.0 KiB
C
92 lines
3.0 KiB
C
/****************************************************************************
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* sched/pthread/pthread_getaffinity.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 <sys/types.h>
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#include <stdint.h>
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#include <pthread.h>
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#include <sched.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/sched.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_getschedparam
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*
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* Description:
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* The pthread_getaffinity_np() function returns the CPU affinity mask
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* of the thread thread in the buffer pointed to by cpuset.
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*
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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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* Input Parameters:
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* thread - The ID of thread whose affinity set will be retrieved.
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* cpusetsize - Size of cpuset. MUST be sizeofcpu_set_t().
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* cpuset - The location to return the thread's new affinity set.
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*
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* Returned 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_getaffinity_np(pthread_t thread, size_t cpusetsize,
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FAR cpu_set_t *cpuset)
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{
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int ret;
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DEBUGASSERT(thread > 0 && cpusetsize == sizeof(cpu_set_t) &&
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cpuset != NULL);
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sinfo("thread ID=%d cpusetsize=%zu cpuset=%ju\n",
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(int)thread, cpusetsize, (uintmax_t)*cpuset);
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/* Let nxsched_get_affinity do all of the work */
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ret = nxsched_get_affinity((pid_t)thread, cpusetsize, cpuset);
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if (ret < 0)
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{
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/* If nxsched_get_affinity() fails, return the positive errno */
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ret = -ret;
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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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