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SMP: Add macros to CPU set manipulation to sched.h

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This commit is contained in:
Gregory Nutt
2016-02-20 18:45:07 -06:00
parent 0eadf1dcad
commit f3356fee5b
3 changed files with 194 additions and 1 deletions
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libc/sched/Make.defs
+4
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@@ -37,6 +37,10 @@
CSRCS += sched_getprioritymax.c sched_getprioritymin.c
ifeq ($(CONFIG_SMP),y)
CSRCS += sched_cpucount.c
endif
ifeq ($(CONFIG_BUILD_PROTECTED),y)
CSRCS += task_startup.c
endif
libc/sched/sched_cpucount.c
+81
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@@ -0,0 +1,81 @@
/****************************************************************************
* libc/sched/sched_cpucount.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 <sched.h>
#ifdef CONFIG_SMP
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sched_cpu_count
*
* Description:
* Return the number of bits set in the 'set'. This could be improved by
* using CPU-specific bit counting instructions.
*
* Inputs:
* set - The set of CPUs to be counted.
*
* Return Value:
* The number of CPUs in 'set'
*
****************************************************************************/
int sched_cpu_count(FAR const cpu_set_t *set);
{
int count;
int cpu;
for (cpu = 0, count = 0; cpu < CONFIG_SMP_NCPUS; cpu++)
{
if ((*set & (1 << cpu)) != 0)
{
count++;
}
}
return count;
}
#endif /* CONFIG_SMP */