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  김영대(2003-03-17 01:57:09, Hit : 4857, Vote : 1419
 [Thread] pthread_cond_broadcast() function

/***************************************************
*--------------------------------------------------
*   Creat  : 2001. 04. 10  (programed by Cori-Young )
*   Site: http://www.byoneself.co.kr
*   Update :
*--------------------------------------------------
*   Compile : cc -o xxx xxx.c -lpthread -lrt
*--------------------------------------------------
* Machine hardware:   sun4u
* OS version:         5.7
* Processor type:     sparc
* Hardware:           SUNW,Ultra-60
***************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <pthread.h>
#include <stdio.h>

#define _MULTI_THREADED
#define NTHREADS    5

static void checkResults(char *string, int rc) {

  if (rc) {
    printf("Error on : %s, rc=%d", string, rc);
    exit(EXIT_FAILURE);
  }
  return;
}

int                 conditionMet = 0;

pthread_cond_t      cond  = PTHREAD_COND_INITIALIZER;
pthread_mutex_t     mutex = PTHREAD_MUTEX_INITIALIZER;

void *threadfunc(void *parm)
{

  int           rc;

  rc = pthread_mutex_lock(&mutex);
  checkResults("pthread_mutex_lock()n", rc);

  while (!conditionMet) {

    printf("Thread blockedn");
    rc = pthread_cond_wait(&cond, &mutex);
    checkResults("pthread_cond_wait()n", rc);
  }

  rc = pthread_mutex_unlock(&mutex);
  checkResults("pthread_mutex_lock()n", rc);
  return NULL;
}

int main(int argc, char **argv)
{
  int                   rc=0;
  int                   i;

  pthread_t             threadid[NTHREADS];

  printf("Enter Testcase - %sn", argv[0]);
  printf("Create %d threadsn", NTHREADS);

  for(i=0; i<NTHREADS; ++i) {

    rc = pthread_create(&threadid[i], NULL, threadfunc, NULL);
    checkResults("pthread_create()n", rc);
  }

  sleep(5);  /* Sleep isn't a very robust way to serialize threads */

  rc = pthread_mutex_lock(&mutex);
  checkResults("pthread_mutex_lock()n", rc);

  /* The condition has occured. Set the flag and wake up any waiters */
  conditionMet = 1;
  printf("Wake up all waiters...n");

  rc = pthread_cond_broadcast(&cond);
  checkResults("pthread_cond_broadcast()n", rc);

  rc = pthread_mutex_unlock(&mutex);
  checkResults("pthread_mutex_unlock()n", rc);

  printf("Wait for threads and cleanupn");

  for (i=0; i<NTHREADS; ++i) {
    rc = pthread_join(threadid[i], NULL);
    checkResults("pthread_join()n", rc);
  }

  pthread_cond_destroy(&cond);
  pthread_mutex_destroy(&mutex);

  printf("Main completedn");
  return 0;
}





43   [Unix/Linux] [Thread] pthread_equal() function  김영대 2003/03/17 4891 1395
42   [Unix/Linux] [Thread] pthread_detach() function  김영대 2003/03/17 5316 1447
41   [Unix/Linux] [Thread] pthread_create() function  김영대 2003/03/17 5186 1377
40   [Unix/Linux] [Thread] pthread_cond_wait() function  김영대 2003/03/17 4894 1347
39   [Unix/Linux] [Thread] pthread_cond_timedwait() function  김영대 2003/03/17 6110 1807
38   [Unix/Linux] [Thread] pthread_cond_signal() function  김영대 2003/03/17 4393 1223
37   [Unix/Linux] [Thread] pthread_cond_init() function  김영대 2003/03/17 5610 1538
36   [Unix/Linux] [Thread] pthread_cond_destroy() function  김영대 2003/03/17 4744 1268
  [Unix/Linux] [Thread] pthread_cond_broadcast() function  김영대 2003/03/17 4857 1419
34   [Unix/Linux] [Thread] pthread_condattr_destroy() function  김영대 2003/03/17 4725 1372
33   [Unix/Linux] [Thread] pthread_cond() function  김영대 2003/03/17 6220 1656
32   [Unix/Linux] [Thread] pthread_cleanup_push() function  김영대 2003/03/17 5083 1475
31   [Unix/Linux] [Thread] pthread_cleanup_pop() function  김영대 2003/03/17 5064 1505
30   [Unix/Linux] [Thread] pthread_cancel() function  김영대 2003/03/17 6026 1728
29   [Unix/Linux] [Thread] pthread_attr_setinheritsched() function  김영대 2003/03/17 5274 1479
28   [Unix/Linux] [Thread] pthread_attr_setdetachstate() function  김영대 2003/03/17 5468 1563
27   [Unix/Linux] [Thread] pthread_attr_init() function  김영대 2003/03/17 4919 1407
26   [Unix/Linux] [Thread] pthread_attr_getschedparam() function  김영대 2003/03/17 5069 1440
25   [Unix/Linux] [Thread] pthread_attr_getinheritsched() function  김영대 2003/03/17 5115 1581
24   [Unix/Linux] [Thread] pthread_attr_getdetachstate() function  김영대 2003/03/17 5176 1514

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