Example: Canceling a thread in a Pthread program
This example shows a Pthread program canceling a long-running thread.
Note: By using the code examples, you agree to the terms of the Code license and disclaimer information.
/*
Filename: ATEST13.QCSRC
The output of this example is as follows:
Enter Testcase - LIBRARY/ATEST13
Create/start a thread
Wait a bit until we 'realize' the thread needs to be canceled
Thread: Entered
Thread: Looping or long running request
Thread: Looping or long running request
Thread: Looping or long running request
Wait for the thread to complete, and release its resources
Thread: Looping or long running request
Thread status indicates it was canceled
Main completed
*/
#define _MULTI_THREADED
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define checkResults(string, val) { \
if (val) { \
printf("Failed with %d at %s", val, string); \
exit(1); \
} \
}
void *theThread(void *parm)
{
printf("Thread: Entered\n");
while (1) {
printf("Thread: Looping or long running request\n");
pthread_testcancel();
sleep(1);
}
return NULL;
}
int main(int argc, char **argv)
{
pthread_t thread;
int rc=0;
void *status;
printf("Enter Testcase - %s\n", argv[0]);
printf("Create/start a thread\n");
rc = pthread_create(&thread, NULL, theThread, NULL);
checkResults("pthread_create()\n", rc);
printf("Wait a bit until we 'realize' the thread needs to be canceled\n");
sleep(3);
rc = pthread_cancel(thread);
checkResults("pthread_cancel()\n", rc);
printf("Wait for the thread to complete, and release its resources\n");
rc = pthread_join(thread, &status);
checkResults("pthread_join()\n", rc);
printf("Thread status indicates it was canceled\n");
if (status != PTHREAD_CANCELED) {
printf("Unexpected thread status\n");
}
printf("Main completed\n");
return 0;
}