66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
/****************************************************************************
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* sched/sched/sched_getcpu.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 <sched.h>
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#include <nuttx/arch.h>
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#include "sched/sched.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sched_getcpu
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*
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* Description:
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* sched_getcpu() returns the number of the CPU on which the calling
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* thread is currently executing.
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*
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* The return CPU number is guaranteed to be valid only at the time of
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* the call. Unless the CPU affinity has been fixed using
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* sched_setaffinity(), the OS might change the CPU at any time. The
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* caller must allow for the possibility that the information returned is
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* no longer current by the time the call returns.
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*
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* Non-Standard. Functionally equivalent to the GLIBC __GNU_SOURCE
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* interface of the same name.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* A non-negative CPU number is returned on success. -1 (ERROR) is
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* returned on failure with the errno value set to indicate the cause of
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* the failure.
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*
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****************************************************************************/
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int sched_getcpu(void)
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{
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return up_cpu_index(); /* Does not fail */
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}
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