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  김영대(2003-03-17 02:09:17, Hit : 5092, Vote : 1312
 [Thread] pthread_rwlock_init() 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

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

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

pthread_rwlock_t       rwlock;

void *rdlockThread(void *arg)
{

  int rc;

  printf("Entered thread, getting read lockn");

  rc = pthread_rwlock_rdlock(&rwlock);
  checkResults("pthread_rwlock_rdlock()n", rc);

  printf("got the rwlock read lockn");
  sleep(5);

  printf("unlock the read lockn");

  rc = pthread_rwlock_unlock(&rwlock);
  checkResults("pthread_rwlock_unlock()n", rc);

  printf("Secondary thread unlockedn");
  return NULL;
}

void *wrlockThread(void *arg)
{
  int rc;

  printf("Entered thread, getting write lockn");

  rc = pthread_rwlock_wrlock(&rwlock);
  checkResults("pthread_rwlock_wrlock()n", rc);

  printf("Got the rwlock write lock, now unlockn");

  rc = pthread_rwlock_unlock(&rwlock);
  checkResults("pthread_rwlock_unlock()n", rc);

  printf("Secondary thread unlockedn");
  return NULL;
}

int main(int argc, char **argv)
{
  int                   rc=0;
  pthread_t             thread, thread1;

  printf("Enter Testcase - %sn", argv[0]);
  printf("Main, initialize the read write lockn");

  rc = pthread_rwlock_init(&rwlock, NULL);
  checkResults("pthread_rwlock_init()n", rc);

  printf("Main, grab a read lockn");

  rc = pthread_rwlock_rdlock(&rwlock);
  checkResults("pthread_rwlock_rdlock()n",rc);

  printf("Main, grab the same read lock againn");

  rc = pthread_rwlock_rdlock(&rwlock);
  checkResults("pthread_rwlock_rdlock() secondn", rc);

  printf("Main, create the read lock threadn");

  rc = pthread_create(&thread, NULL, rdlockThread, NULL);
  checkResults("pthread_createn", rc);

  printf("Main - unlock the first read lockn");

  rc = pthread_rwlock_unlock(&rwlock);
  checkResults("pthread_rwlock_unlock()n", rc);

  printf("Main, create the write lock threadn");

  rc = pthread_create(&thread1, NULL, wrlockThread, NULL);
  checkResults("pthread_createn", rc);

  sleep(5);
  printf("Main - unlock the second read lockn");

  rc = pthread_rwlock_unlock(&rwlock);
  checkResults("pthread_rwlock_unlock()n", rc);

  printf("Main, wait for the threadsn");

  rc = pthread_join(thread, NULL);
  checkResults("pthread_joinn", rc);

  rc = pthread_join(thread1, NULL);
  checkResults("pthread_joinn", rc);

  rc = pthread_rwlock_destroy(&rwlock);
  checkResults("pthread_rwlock_destroy()n", rc);

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





42   [Unix/Linux] [Thread] pthread_muxtexcond() function  김영대 2003/03/17 5095 1383
41   [Unix/Linux] [Thread] pthread_rwlock_init() function  김영대 2003/03/17 4847 1241
  [Unix/Linux] [Thread] pthread_rwlock_init() function  김영대 2003/03/17 5092 1312
39   [Unix/Linux] [Thread] pthread_self() function  김영대 2003/03/17 5148 1466
38   [Unix/Linux] [Thread] pthread_join() function  김영대 2003/03/17 4831 1223
37   [Unix/Linux] [Thread] pthread_mutex_unlock() function  김영대 2003/03/17 4579 1248
36   [Unix/Linux] [Thread] pthread_mutex_lock() function  김영대 2003/03/17 4677 1190
35   [Unix/Linux] [Thread] pthread_mutex_trylock() function  김영대 2003/03/17 4524 1048
34   [Unix/Linux] [Thread] pthread_mutexattr_destroy() function  김영대 2003/03/17 4490 1197
33   [Unix/Linux] [Thread] pthread_mutexattr_init() function  김영대 2003/03/17 5830 1580
32   [Unix/Linux] [Thread] pthread_mutex_init() function  김영대 2003/03/17 5375 1402
31   [Unix/Linux] [Thread] pthread_key_delete() function  김영대 2003/03/17 4464 1231
30   [Unix/Linux] [Thread] pthread_key_create() function  김영대 2003/03/17 5180 1362
29   [Unix/Linux] [Thread] pthread_setschedparam() function  김영대 2003/03/17 9869 1706
28   [Unix/Linux] [Thread] pthread_setcanceltype() function  김영대 2003/03/17 4568 1236
27   [Unix/Linux] [Thread] pthread_setcancelstate() function  김영대 2003/03/17 4849 1305
26   [Unix/Linux] [Thread] pthread_once() function  김영대 2003/03/17 5689 1541
25   [Unix/Linux] [Thread] pthread_getschedparam() function  김영대 2003/03/17 4701 1349
24   [Unix/Linux] [Thread] pthread_exit() function  김영대 2003/03/17 4665 1327
23   [Unix/Linux] [Thread] pthread_equal() function  김영대 2003/03/17 4829 1371

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