undefined reference to'CPU_ZERO'问题

[chinawhom]

我在使用sched_setaffinity将线程和CPU绑定，但总显示“undefined reference to'CPU_ZERO'”。我在文件头已经写了
#define __USE_GNU
#include <sched.h>
为什么出现这些问题，怎样解决？谢谢

[深夜航船]

1.你看看是不是包含了pthread.h 在sched.h之前如果是这样，那么把他放到后面去。
2.用gcc -E选项来查看一下预处理的代码

good lucky

[qq120848369]

       #define _GNU_SOURCE
       #include <sched.h>
       #include <stdlib.h>
       #include <unistd.h>
       #include <stdio.h>
       #include <assert.h>

       int
       main(int argc, char *argv[])
       {
           cpu_set_t *cpusetp;
           size_t size;
           int num_cpus, cpu;

           if (argc < 2) {
               fprintf(stderr, "Usage: %s <num-cpus>\n", argv[0]);
               exit(EXIT_FAILURE);
           }

           num_cpus = atoi(argv[1]);

           cpusetp = CPU_ALLOC(num_cpus);
           if (cpusetp == NULL) {
               perror("CPU_ALLOC");
               exit(EXIT_FAILURE);
           }

           size = CPU_ALLOC_SIZE(num_cpus);

           CPU_ZERO_S(size, cpusetp);
           for (cpu = 0; cpu < num_cpus; cpu += 2)
               CPU_SET_S(cpu, size, cpusetp);

           printf("CPU_COUNT() of set:    %d\n", CPU_COUNT_S(size, cpusetp));

           CPU_FREE(cpusetp);
           exit(EXIT_SUCCESS);
       }

manpage里，运行毫无为题。