67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/****************************************************************************
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* libs/libc/sched/sched_cpucount.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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#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: sched_cpucount
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*
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* Description:
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* Return the number of bits set in the 'set'. This could be improved by
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* using CPU-specific bit counting instructions.
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*
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* Input Parameters:
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* set - The set of CPUs to be counted.
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*
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* Returned Value:
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* The number of CPUs in 'set'
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*
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****************************************************************************/
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int sched_cpucount(FAR const cpu_set_t *set)
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{
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int count;
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int cpu;
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for (cpu = 0, count = 0; cpu < CONFIG_SMP_NCPUS; cpu++)
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{
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if ((*set & (1 << cpu)) != 0)
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{
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count++;
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}
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}
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return count;
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}
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#endif /* CONFIG_SMP */
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