[Buildroot] [BUILDROOT] CPU allocation for a thread with CPU_SET, CPU_ZERO

[thierry.xenomai43 at yahoo.com]

 Hello,I would like allocate threads at one specific core with CPU_SET and CPU_ZERO.My target is a RaspberryPi 3 and I use Buildroot 2016.11.2RT + uclib 1.0.19 + PREEMPT_RT patch.
But when I compile my program I get this error :-----------------------------------------------------------------------test.c:107:1: attention : implicit declaration of function CPU_ZERO [-Wimplicit-function-declaration]
 CPU_ZERO(&thecpus);
 ^
test.c:108:1: attention : implicit declaration of function CPU_SET [-Wimplicit-function-declaration]
 CPU_SET(0, &thecpus);
 ^
test.c:109:5: attention : implicit declaration of function ˜sched_setaffinity [-Wimplicit-function-declaration]
 if (sched_setaffinity(getpid(), sizeof(cpu_set_t), &thecpus)< 0)
-----------------------------------------------------------------------
>>> My “<Buildroot>/output/build/uclib-1.0.19/include/sched.h” file is the next :-----------------------------------------------------------------------
[...]#if defined __USE_GNU && defined __UCLIBC_LINUX_SPECIFIC__
/* Access macros for `cpu_set'.  */
# define CPU_SETSIZE __CPU_SETSIZE
# define CPU_SET(cpu, cpusetp)  __CPU_SET_S (cpu, sizeof (cpu_set_t), cpusetp)
# define CPU_CLR(cpu, cpusetp)  __CPU_CLR_S (cpu, sizeof (cpu_set_t), cpusetp)
# define CPU_ISSET(cpu, cpusetp) __CPU_ISSET_S (cpu, sizeof (cpu_set_t), \
      cpusetp)
[...]# define CPU_ALLOC_SIZE(count) __CPU_ALLOC_SIZE (count)
# define CPU_ALLOC(count) __CPU_ALLOC (count)
# define CPU_FREE(cpuset) __CPU_FREE (cpuset)
/* Set the CPU affinity for a task */
extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
         const cpu_set_t *__cpuset) __THROW;/* Get the CPU affinity for a task */
extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
         cpu_set_t *__cpuset) __THROW;[...]
-----------------------------------------------------------------------
>>> My source code is the next:-----------------------------------------------------------------------
#ifndef __USE_GNU
#define __USE_GNU
#endif#ifndef __UCLIBC_LINUX_SPECIFIC__
#define __UCLIBC_LINUX_SPECIFIC__
#endif/*
#include "/home/thierry/MesProgrammes/C/buildroot/buildroot-2016.11.2RT_PREEMPT/output/build/uclibc-1.0.19/include/sched.h"
*/#include <sched.h>
#include <stdio.h>
#include <pthread.h>
#include <semaphore.h>
#include <time.h>
#include <stdlib.h>
#include <unistd.h>[...]int main ()
{
pthread_t tid1, tid2, tid3;
cpu_set_t thecpus;CPU_ZERO(&thecpus);
CPU_SET(0, &thecpus);
if (sched_setaffinity(getpid(), sizeof(cpu_set_t), &thecpus)< 0)
   perror("set affinity");[...]
}
-----------------------------------------------------------------------
When I put a volontary syntax error on “<Buildroot>/output/build/uclib-1.0.19/include/sched.h” I never get error when I make.
I think that the compilator don't watch a good 'sched.h' file
Do you think that is a bad path configuration?
Regard,
Thierry
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