pthread_cancel

 1 #include <pthread.h>
 2 #include <stdio.h>
 3 #include<stdlib.h>
 4 #include <unistd.h>
 5 
 6 static void checkResults(char *string, int rc) {
 7     if (rc) {
 8         printf("Error on : %s, rc=%d",
 9                 string, rc);
10         exit(EXIT_FAILURE);
11     }   
12     return;
13 }
14 
15 void *threadfunc(void *parm)
16 {
17     printf("Entered secondary thread\n");
18     int cnt = 0;
19     while (1) {
20         printf("Secondary thread is looping, %d\n", cnt);
21         cnt ++; 
22         pthread_testcancel();
23         sleep(1);
24     }   
25     return NULL;
26 }
27 
28 int main(int argc, char **argv)
29 {
30     pthread_t             thread;
31     int                   rc=0;
32     void                  *thread_result;
33 
34     printf("Entering testcase\n");
35 
36     /* Create a thread using default attributes */
37     printf("Create thread using the NULL attributes\n");
38     rc = pthread_create(&thread, NULL, threadfunc, NULL);
39     checkResults("pthread_create(NULL)\n", rc);
40 
41     /* sleep() is not a very robust way to wait for the thread */
42     sleep(4);
43 
44     printf("Cancel the thread\n");
45     rc = pthread_cancel(thread);
46     checkResults("pthread_cancel()\n", rc);
47 
48     rc = pthread_join(thread, &thread_result);
49     if (thread_result == PTHREAD_CANCELED)
50         printf(" return PTHREAD_CANCELED\n");
51 
52     /* sleep() is not a very robust way to wait for the thread */
53     sleep(3);
54     printf("Main completed\n");
55     return 0;
56 }