Linux下線程的創建和等待

1. #include <stdio.h>
2. #include <unistd.h>
3. #include <stdlib.h>
4. #include <string.h>
5. #include <pthread.h>
6. char message[]="hello world ";
7. void *thread_function(void *arg)//線程函數
8. {
9. printf("thread_function is running, Argument is %s\n",(char *)arg);
10. sleep(3);
11. strcpy(message,"Bye!");
12. pthread_exit("Thank you for the cpu time");//www.linuxidc.com注意線程退出函數
13. }
15. int main()
16. {
17. int res;
18. pthread_t a_thread; //新線程的標識符
19. void *thread_result;//定義一個線程返回值
20. res=pthread_create(&a_thread,NULL,thread_function,(void *)message);//創建線程
21. if(res!=0)//線程創建不成功
22. {
23. perror("Thread create error!");
24. exit(EXIT_FAILURE);
25. }
26. printf("waiting for thread to finish...\n");
27. res=pthread_join(a_thread,&thread_result);//等待新線程結束
28. if(res!=0)
29. {
30. perror("Thread join error!");
31. exit(EXIT_FAILURE);
32. }
33. printf("Thread joined , it returned %s\n",(char *)thread_result);
34. printf("Message is now %s\n",message);
35. exit(EXIT_SUCCESS);
36. }

注意，多線程的編譯和普通程序的編譯是不一樣的，要用這樣的命令： 【cc -D_REENTRANT thread.c -g -o thread -lpthread】

大家可以看到，全局變量message經過線程創建函數傳遞給線程函數後由【hello world】變成了【Bye!】

1. res=pthread_join(a_thread,&thread_result);//等待新線程結束