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#ifdef __APPLE__
#include <sys/types.h>
#include <sys/sysctl.h>
#elif linux
#define _GNU_SOURCE
#include <sched.h>
#else
#error unsupported platform
#endif
#include <util.h>
#include <platform.h>
#ifdef __APPLE__
int nr_cpus()
{
int n;
size_t size = sizeof(n);
if (sysctlbyname("machdep.cpu.core_count", &n, &size, NULL, 0) != 0) {
pr_err("failed to get number of cpu cores: %s\n", strerrno());
return -1;
}
return n;
}
int set_thread_affinity(pthread_t tid, int core)
{
pr_warn("setting thread afinity is not implemented on apple\n");
return 0;
}
#endif
#ifdef linux
int nr_cpus()
{
cpu_set_t cpu_set;
if (sched_getaffinity(0, sizeof(cpu_set_t), &cpu_set) == 0)
return CPU_COUNT(&cpu_set);
return -1;
}
int set_thread_affinity(pthread_t tid, int core)
{
cpu_set_t target_cpu_set;
int ret = 0;
CPU_ZERO(&target_cpu_set);
CPU_SET(core, &target_cpu_set);
ret = pthread_setaffinity_np(tid, sizeof(target_cpu_set), &target_cpu_set);
if (ret < 0)
pr_err("failed to set thread/cpu affinity for core %d: %s",
core, strerrno());
return ret;
}
#endif
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