gettid()获取线程ID测试程序

 

1、第一种方法

#include "stdio.h"#include "stdlib.h"#include "unistd.h"#include "pthread.h"#include <sys/syscall.h>#define gettid() syscall(__NR_gettid)const int M = 3;pthread_t hThread[M];int threadId[M];void *hello(void *ptr) {int id = *(int *)(ptr);printf("Hello! %d/n", id);printf("Thread id:%d/n", gettid());sleep(1);}void initThreade() {int i;for (i = 0; i < M; ++i) {threadId[i] = i;}}void MyThreads() {int i;for (i = 0; i < M; i++) {pthread_create(hThread + i, NULL, hello, (void *)(threadId + i));}for (i = 0; i < M; i++) {pthread_join(hThread[i], NULL);}}int main(){initThreade();MyThreads();return 0;}g++ hello.c -o hello -lpthread
[root@zhuliting ft]# g++ hello.c -o hello -lpthread

[root@zhuliting ft]# ./hello
Hello! 0
Thread id:17783
Hello! 1
Thread id:17784
Hello! 2
Thread id:17785

 

 

注意：

1、第5、6行不能少，否则会出现错误：error: ‘gettid’ was not declared in this scope 

2、#include <sys/types.h>代替第5、6行

http://www.kernel.org/doc/man-pages/online/pages/man2/gettid.2.html 

3、编译加上-lpthread选项，不然会出现“undefined reference to `pthread_create'”错误