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/*
* THREADING_OSX.H
* http://yyshen.github.io/2015/01/18/binding_threads_to_cores_osx.html
*/
#pragma once
#include <mach/mach_types.h>
#include <mach/thread_act.h>
#include <sys/sysctl.h>
#define SYSCTL_CORE_COUNT "machdep.cpu.core_count"
struct cpu_set_t
{
uint32_t count;
} ;
static inline void CPU_ZERO(cpu_set_t *cs) { cs->count = 0; }
static inline void CPU_SET(int num, cpu_set_t *cs) { cs->count |= (1 << num); }
[[nodiscard]]
static inline int CPU_ISSET(int num, cpu_set_t *cs) { return (cs->count & (1 << num)); }
[[nodiscard]]
int sched_getaffinity(pid_t pid, size_t cpu_size, cpu_set_t *cpu_set)
{
int32_t core_count = 0;
size_t len = sizeof(core_count);
int ret = sysctlbyname(SYSCTL_CORE_COUNT, &core_count, &len, 0, 0);
if (ret)
{
// printf("error while get core count %d\n", ret);
return -1;
}
cpu_set->count = 0;
for (int i = 0; i < core_count; i++)
{
cpu_set->count |= (1 << i);
}
return 0;
}
[[nodiscard]]
int pthread_setaffinity_np(pthread_t thread, size_t cpu_size, cpu_set_t *cpu_set)
{
thread_port_t mach_thread;
int core = 0;
for (core = 0; core < 8 * cpu_size; core++)
{
if (CPU_ISSET(core, cpu_set))
break;
}
// printf("binding to core %d\n", core);
thread_affinity_policy_data_t policy = { core };
mach_thread = pthread_mach_thread_np(thread);
thread_policy_set(mach_thread, THREAD_AFFINITY_POLICY, (thread_policy_t)&policy, 1);
return 0;
}
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