pthread的一个程序，咋编译不过呢？

macarthor

在《Beginning Linux Programming 3rd》的第481页

1. 
   
2. #include <stdio.h>
   
3. #include <unistd.h>
   
4. #include <stdlib.h>
   
5. #include <pthread.h>
   
6. #include <string.h>
   
7. 
   
8. char message[] = "Hello World";
   
9. 
   
10. void *thread_function(void *arg){
    
11.         printf("thread_function is running. Argument was %s\n", (char *)arg);
    
12.         sleep(3);
    
13.         strcpy(message, "Bye!");
    
14.         pthread_exit("Thank you for the CPU time");
    
15. }
    
16. 
    
17. int main(){
    
18.         int res;
    
19.         pthread_t a_thread;
    
20.         void *thread_result;
    
21. 
    
22.         res = pthread_create(&a_thread, NULL, thread_function, (void *)message);
    
23.         if(0 != res){
    
24.                 perror("Thread creation failed");
    
25.                 exit(EXIT_FAILURE);
    
26.         }
    
27. 
    
28.         printf("Waiting for thread to finish...\n");
    
29. 
    
30.         res = pthread_join(a_thread, &thread_result);
    
31.         if(0 != res){
    
32.                 perror("Thread join failed");
    
33.                 exit(EXIT_FAILURE);
    
34.         }
    
35. 
    
36.         printf("Thread joined, it returned %s\n", (char *)thread_result);
    
37.         printf("Message[] is now %s\n", message);
    
38. 
    
39.         return 0;
    
40. }
    
41. 
    

复制代码

编译输出为

1. 
   
2. [root@localhost thread]# gcc -Wall thread.c -o thread
   
3. /tmp/cca0ZbjQ.o(.text+0x69): In function 'main':
   
4. : undefined reference to 'pthread_create'
   
5. /tmp/cca0ZbjQ.o(.text+0xae): In function 'main':
   
6. : undefined reference to 'pthread_join'
   
7. collect2: ld returned 1 exit status
   

复制代码

咋整啊？

macarthor

got it

用下边的命令编译
gcc -Wall thread.c -o thread -lpthread