获取 TID

/* 文件名：gettid.c */
/* 说明：获取 TID 例程 */

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <pthread.h>

void *thread_fun(void *arg)
{
    pid_t pid;
    pthread_t th;
    int index = (int)arg;
    th = pthread_self();
    printf("pthread of thread %d is: %x\n", index, (int)th);
    pid = getpid();
    printf("PID of thread %d is: %d\n", index, pid);
    pid = syscall(SYS_gettid);
    printf("TID of thread %d is: %d\n", index, pid);
    return NULL;
}

int main(void)
{
    int i;
    pid_t pid;
    pthread_t th;
    pid = getpid();
    printf("PID of main process is: %d\n", pid);
    pid = syscall(SYS_gettid);
    printf("TID of main process is: %d\n", pid);
    for (i = 0; i < 3; i++) {
        if (pthread_create(&th, NULL, thread_fun, (void *)i)) {
            perror("main: pthread_create()");
            return -1;
        }
        pthread_join(th, NULL);
    }
    return 0;
}