相关函数：
sched_setaffinity, sched_getaffinity, CPU_CLR, CPU_ISSET, CPU_SET, CPU_ZERO - set and get a process's CPU affinity mask
 
 
#define _GNU_SOURCE
#include <sched.h>

int sched_setaffinity(pid_t pid, unsigned int cpusetsize,
cpu_set_t *mask);

int sched_getaffinity(pid_t pid, unsigned int cpusetsize,
cpu_set_t *mask);

void CPU_CLR(int cpu, cpu_set_t *set);
int CPU_ISSET(int cpu, cpu_set_t *set);
void CPU_SET(int cpu, cpu_set_t *set);
void CPU_ZERO(cpu_set_t *set);
 
 
CPU_ZERO(&mask);
CPU_SET(cpu_id, &mask);
sched_setaffinity(pid, sizeof(mask), &mask);