test-cancel.c

A1vrhw37.txt (text/plain), 1.89 KB, created by Diego Elio Pettenò (RETIRED) on 2006-03-26 18:10:18 UTC

#define _MULTI_THREADED
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

#define checkResults(...)

void cleanupHandler(void *parm) {
  printf("Inside cancelation cleanup handler\n");
}

void *threadfunc(void *parm)
{
  unsigned int  i=0;
  int           rc=0, oldState=0;
  printf("Entered secondary thread\n");
  pthread_cleanup_push(cleanupHandler, NULL);
  rc = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
  checkResults("pthread_setcancelstate()\n", rc);
  /* Allow cancel to be pending on this thread */
  sleep(2);
  while (1) {
    printf("Secondary thread is now looping\n");
    ++i;
    sleep(1);
    /* pthread_testcancel() has no effect until cancelability is enabled.*/
    /* At that time, a call to pthread_testcancel() should result in the */
    /* pending cancel being acted upon                                   */
    pthread_testcancel();
    if (i == 5) {
      printf("Cancel state set to ENABLE\n");
      rc = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE,&oldState);
      checkResults("pthread_setcancelstate(2)\n", rc);
      /* Now, cancellation points will allow pending cancels
         to get through to this thread */
    }
  } /* infinite */
  pthread_cleanup_pop(0);
  return NULL;
}

int main(int argc, char **argv)
{
  pthread_t             thread;
  int                   rc=0;
  void                 *status=NULL;

  printf("Enter Testcase - %s\n", argv[0]);

  /* Create a thread using default attributes */
  printf("Create thread using the NULL attributes\n");
  rc = pthread_create(&thread, NULL, threadfunc, NULL);
  checkResults("pthread_create(NULL)\n", rc);

  sleep(1);
  printf("Cancel the thread\n");
  rc = pthread_cancel(thread);
  checkResults("pthread_cancel()\n", rc);

  rc = pthread_join(thread, &status);
  if (status != PTHREAD_CANCELED) {
    printf("Thread returned unexpected result!\n");
    exit(1);
  }
  printf("Main completed\n");
  return 0;
}