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  김영대(2003-03-17 02:00:35, Hit : 5692, Vote : 1541
 [Thread] pthread_once() 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         NUMTHREADS    3

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

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

int             number      = 0;
int             okStatus    = 777;

pthread_once_t  onceControl = PTHREAD_ONCE_INIT;

void initRoutine(void)
{
  printf("In the initRoutinen");
  number++;
}

void *threadfunc(void *parm)
{

  printf("Inside secondary threadn");

  pthread_once(&onceControl, initRoutine);
  return (void *)(okStatus);
}

int main(int argc, char **argv)
{

  pthread_t             thread[NUMTHREADS];
  int                   rc=0;
  int                   i=NUMTHREADS;
  void                 *status;

  printf("Enter Testcase - %sn", argv[0]);

  for (i=0; i < NUMTHREADS; ++i) {
    printf("Create thread %dn", i);

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

  for (i=0; i < NUMTHREADS; ++i) {

    printf("Wait for thread %dn", i);

    rc = pthread_join(thread[i], &status);
    checkResults("pthread_join()n", rc);

    if ((status) != (int *)okStatus) {
      printf("Secondary thread failedn");
      exit(1);
    }
  }

  if (number != 1) {
    printf("An incorrect number of 1 one-time init routine was called!n");
    exit(1);
  }

  printf("One-time init routine called exactly oncen");
  printf("Main completedn");

  return 0;

}





63   [Unix/Linux] [Thread] 생산자/소비자  김영대 2003/03/17 5573 1440
62   [Unix/Linux] [Thread] pthread_setschedparam() function  김영대 2003/03/17 9879 1706
61   [Unix/Linux] [Thread] pthread_setcanceltype() function  김영대 2003/03/17 4574 1236
60   [Unix/Linux] [Thread] pthread_setcancelstate() function  김영대 2003/03/17 4857 1305
59   [Unix/Linux] [Thread] pthread_self() function  김영대 2003/03/17 5151 1466
58   [Unix/Linux] [Thread] pthread_rwlock_init() function  김영대 2003/03/17 5096 1312
57   [Unix/Linux] [Thread] pthread_rwlock_init() function  김영대 2003/03/17 4851 1243
  [Unix/Linux] [Thread] pthread_once() function  김영대 2003/03/17 5692 1541
55   [Unix/Linux] [Thread] pthread_muxtexcond() function  김영대 2003/03/17 5104 1385
54   [Unix/Linux] [Thread] pthread_mutex_unlock() function  김영대 2003/03/17 4584 1248
53   [Unix/Linux] [Thread] pthread_mutex_trylock() function  김영대 2003/03/17 4529 1049
52   [Unix/Linux] [Thread] pthread_mutex_lock() function  김영대 2003/03/17 4682 1190
51   [Unix/Linux] [Thread] pthread_mutex_init() function  김영대 2003/03/17 5380 1402
50   [Unix/Linux] [Thread] pthread_mutexattr_init() function  김영대 2003/03/17 5835 1581
49   [Unix/Linux] [Thread] pthread_mutexattr_destroy() function  김영대 2003/03/17 4493 1197
48   [Unix/Linux] [Thread] pthread_key_delete() function  김영대 2003/03/17 4469 1231
47   [Unix/Linux] [Thread] pthread_key_create() function  김영대 2003/03/17 5185 1363
46   [Unix/Linux] [Thread] pthread_join() function  김영대 2003/03/17 4836 1224
45   [Unix/Linux] [Thread] pthread_getschedparam() function  김영대 2003/03/17 4705 1351
44   [Unix/Linux] [Thread] pthread_exit() function  김영대 2003/03/17 4668 1328

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