/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * RWLock rank tests
 */

#include "nspr.h"
#include "plgetopt.h"

static int _debug_on;
static PRRWLock* rwlock0;
static PRRWLock* rwlock1;
static PRRWLock* rwlock2;

static void rwtest(void* args) {
  PR_RWLock_Rlock(rwlock1);
  PR_RWLock_Unlock(rwlock1);

  PR_RWLock_Rlock(rwlock1);
  PR_RWLock_Unlock(rwlock1);

  /* Test correct lock rank. */
  PR_RWLock_Rlock(rwlock1);
  PR_RWLock_Rlock(rwlock2);
  PR_RWLock_Unlock(rwlock2);
  PR_RWLock_Unlock(rwlock1);

  PR_RWLock_Rlock(rwlock1);
  PR_RWLock_Rlock(rwlock2);
  PR_RWLock_Unlock(rwlock1);
  PR_RWLock_Unlock(rwlock2);

  PR_RWLock_Rlock(rwlock1);
  PR_RWLock_Rlock(rwlock0);
  PR_RWLock_Rlock(rwlock2);
  PR_RWLock_Unlock(rwlock2);
  PR_RWLock_Unlock(rwlock0);
  PR_RWLock_Unlock(rwlock1);

#if 0
    /* Test incorrect lock rank. */
    PR_RWLock_Rlock(rwlock2);
    PR_RWLock_Rlock(rwlock1);
    PR_RWLock_Unlock(rwlock1);
    PR_RWLock_Unlock(rwlock2);

    PR_RWLock_Rlock(rwlock2);
    PR_RWLock_Rlock(rwlock0);
    PR_RWLock_Rlock(rwlock1);
    PR_RWLock_Unlock(rwlock1);
    PR_RWLock_Unlock(rwlock0);
    PR_RWLock_Unlock(rwlock2);
#endif
}

int main(int argc, char** argv) {
  PRStatus rc;
  PRThread* thread;
  PLOptStatus os;
  PLOptState* opt = PL_CreateOptState(argc, argv, "d");

  while (PL_OPT_EOL != (os = PL_GetNextOpt(opt))) {
    if (PL_OPT_BAD == os) {
      continue;
    }
    switch (opt->option) {
      case 'd': /* debug mode */
        _debug_on = 1;
        break;
      default:
        break;
    }
  }
  PL_DestroyOptState(opt);

  rwlock0 = PR_NewRWLock(PR_RWLOCK_RANK_NONE, "Lock 0");
  if (rwlock0 == NULL) {
    fprintf(stderr, "PR_NewRWLock failed - error %d\n", (int)PR_GetError());
    return 1;
  }
  rwlock1 = PR_NewRWLock(1, "Lock 1");
  if (rwlock1 == NULL) {
    fprintf(stderr, "PR_NewRWLock failed - error %d\n", (int)PR_GetError());
    return 1;
  }
  rwlock2 = PR_NewRWLock(2, "Lock 2");
  if (rwlock2 == NULL) {
    fprintf(stderr, "PR_NewRWLock failed - error %d\n", (int)PR_GetError());
    return 1;
  }

  thread = PR_CreateThread(PR_USER_THREAD, rwtest, NULL, PR_PRIORITY_NORMAL,
                           PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);
  if (thread == NULL) {
    fprintf(stderr, "PR_CreateThread failed - error %d\n", (int)PR_GetError());
    PR_ProcessExit(2);
  }
  if (_debug_on) {
    printf("%s: created thread = %p\n", argv[0], thread);
  }

  rc = PR_JoinThread(thread);
  PR_ASSERT(rc == PR_SUCCESS);

  PR_DestroyRWLock(rwlock0);
  rwlock0 = NULL;
  PR_DestroyRWLock(rwlock1);
  rwlock1 = NULL;
  PR_DestroyRWLock(rwlock2);
  rwlock2 = NULL;

  printf("PASS\n");
  return 0;
}