TestSchedAffinity.cmake

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# - Define macro to check if all of the following work:
# sched_getaffinity()
# sched_setaffinity()
# CPU_ZERO()
# CPU_SET()
# CPU_ISSET()
# CPU_CLR()
# CPU_COUNT()

#  test_sched_affinity(VARIABLE)
#
#  VARIABLE will be set to true if all of the functions link fine.

macro(test_sched_affinity VARIABLE)

  if(NOT DEFINED sched_affinity_compile)
    message(STATUS "Checking for sched.h GNU affinity API")

    check_c_source_compiles(
      "#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#include <sched.h>
int main(void) {
  int i;
  cpu_set_t mask;
  CPU_ZERO(&mask);
  sched_getaffinity(0, sizeof(cpu_set_t), &mask);
  if(CPU_ISSET(0,&mask))
  {
    CPU_CLR(0,&mask);
    CPU_SET(0,&mask);
  }
  sched_setaffinity(0, sizeof(cpu_set_t), &mask);
  return CPU_COUNT(&mask);
}" sched_affinity_compile)
  endif(NOT DEFINED sched_affinity_compile)

  if(sched_affinity_compile)
    set(${VARIABLE} 1 CACHE INTERNAL "Result of test for sched.h GNU affinity API" FORCE)
  else()
    set(${VARIABLE} 0 CACHE INTERNAL "Result of test for sched.h GNU affinity API" FORCE)
  endif()
endmacro(test_sched_affinity VARIABLE)