pthread_cleanup_push 爲塞進即註冊一個清理函數
pthread_cleanup_pop 爲彈出即取消一個清理函數
執行順序與註冊順序相反。
1.源代碼：
cat -n 11_5.c
1 #include "apue.h"
2 #include <pthread.h>
3
4 void cleanup(void *s)
5 {
6 printf("%s executed\n",(char *) s);
7 }
8
9 void * td_func1(char * arg)
10 {
11 printf("execute thread1 function\n");
12 pthread_cleanup_push(cleanup,"Thread 1 cleanup first");
13 pthread_cleanup_push(cleanup,"Thread 1 cleanup second");
14
15 if (arg)
16 return ((void *)1);
17
18 pthread_cleanup_pop(0);
19 pthread_cleanup_pop(0);
20
21 return ((void *)1);
22 }
23 void * td_func2(char * arg)
24 {
25 printf("execute thread2 function\n");
26 pthread_cleanup_push(cleanup,"Thread 2 cleanup first");
27 pthread_cleanup_push(cleanup,"Thread 2 cleanup second");
28
29 if (arg)
30 pthread_exit ((void *)2);
31
32 pthread_cleanup_pop(0);
33 pthread_cleanup_pop(0);
34
35 pthread_exit ((void *)2);
36 }
37
38
39 int main()
40 {
41 int err;
42 pthread_t tid1,tid2;
43 void *tret;
44
45 err = pthread_create(&tid1,NULL,td_func1,(void *)0);
46 if (err != 0)
47 err_exit(err,"Create thread 1 error");
48
49 err = pthread_create(&tid2,NULL,td_func2,(void *)2);
50 if (err != 0)
51 err_exit(err,"Create thread 2 error");
52
53 err = pthread_join(tid1,&tret);
54 if (err != 0)
55 err_exit(err,"Join thread 1 error");
56 printf("Thread 1 exit successfully with code:%d\n",(int)tret);
57
58 err = pthread_join(tid2,&tret);
59 if (err != 0)
60 err_exit(err,"Join thread 2 error");
61 printf("Thread 2 exit successfully with code:%d\n",(int)tret);
62
63 return (0);
64 }
2.編譯及運行結果：
gcc -Wall -ggdb3 11_5.c error.c -o cleanup -lpthread
11_5.c: In function `td_func2':
11_5.c:36: warning: control reaches end of non-void function
11_5.c: In function `main':
11_5.c:45: warning: passing arg 3 of `pthread_create' from incompatible pointer type
11_5.c:49: warning: passing arg 3 of `pthread_create' from incompatible pointer type
error.c: In function `err_doit':
error.c:121: warning: implicit declaration of function `vsnprintf'
error.c:123: warning: implicit declaration of function `snprintf'
<bldc:/home/tingbinz/apue.3e/SBSCODE/11>R*_*G:./cleanup
execute thread1 function
execute thread2 function
Thread 1 exit successfully with code:1
Thread 2 cleanup second executed
Thread 2 cleanup first executed
Thread 2 exit successfully with code:2