/* 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/. */

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

#include <stdio.h>

#ifdef DEBUG
#  define SEM_D "D"
#else
#  define SEM_D
#endif
#ifdef IS_64
#  define SEM_64 "64"
#else
#  define SEM_64
#endif

#define SHM_NAME "/tmp/counter" SEM_D SEM_64
#define SEM_NAME1 "/tmp/foo.sem" SEM_D SEM_64
#define SEM_NAME2 "/tmp/bar.sem" SEM_D SEM_64
#define ITERATIONS 1000

static PRBool debug_mode = PR_FALSE;
static PRIntn iterations = ITERATIONS;
static PRSem *sem1, *sem2;

static void Help(void) {
  fprintf(stderr, "semapong test program usage:\n");
  fprintf(stderr, "\t-d           debug mode         (FALSE)\n");
  fprintf(stderr, "\t-c <count>   loop count         (%d)\n", ITERATIONS);
  fprintf(stderr, "\t-h           this message\n");
} /* Help */

int main(int argc, char** argv) {
  PRIntn i;
  PRSharedMemory* shm;
  PRIntn* counter_addr;
  PLOptStatus os;
  PLOptState* opt = PL_CreateOptState(argc, argv, "dc:h");

  while (PL_OPT_EOL != (os = PL_GetNextOpt(opt))) {
    if (PL_OPT_BAD == os) {
      continue;
    }
    switch (opt->option) {
      case 'd': /* debug mode */
        debug_mode = PR_TRUE;
        break;
      case 'c': /* loop count */
        iterations = atoi(opt->value);
        break;
      case 'h':
      default:
        Help();
        return 2;
    }
  }
  PL_DestroyOptState(opt);

  shm = PR_OpenSharedMemory(SHM_NAME, sizeof(*counter_addr), 0, 0666);
  if (NULL == shm) {
    fprintf(stderr, "PR_OpenSharedMemory failed (%d, %d)\n", PR_GetError(),
            PR_GetOSError());
    exit(1);
  }
  sem1 = PR_OpenSemaphore(SEM_NAME1, 0, 0, 0);
  if (NULL == sem1) {
    fprintf(stderr, "PR_OpenSemaphore failed (%d, %d)\n", PR_GetError(),
            PR_GetOSError());
    exit(1);
  }
  sem2 = PR_OpenSemaphore(SEM_NAME2, 0, 0, 0);
  if (NULL == sem2) {
    fprintf(stderr, "PR_OpenSemaphore failed (%d, %d)\n", PR_GetError(),
            PR_GetOSError());
    exit(1);
  }

  counter_addr = PR_AttachSharedMemory(shm, 0);
  if (NULL == counter_addr) {
    fprintf(stderr, "PR_AttachSharedMemory failed\n");
    exit(1);
  }

  /*
   * Process 2 waits on semaphore 2 and posts to semaphore 1.
   */
  for (i = 0; i < iterations; i++) {
    if (PR_WaitSemaphore(sem2) == PR_FAILURE) {
      fprintf(stderr, "PR_WaitSemaphore failed\n");
      exit(1);
    }
    if (*counter_addr == 2 * i + 1) {
      if (debug_mode) {
        printf("process 2: counter = %d\n", *counter_addr);
      }
    } else {
      fprintf(stderr, "process 2: counter should be %d but is %d\n", 2 * i + 1,
              *counter_addr);
      exit(1);
    }
    (*counter_addr)++;
    if (PR_PostSemaphore(sem1) == PR_FAILURE) {
      fprintf(stderr, "PR_PostSemaphore failed\n");
      exit(1);
    }
  }
  if (PR_DetachSharedMemory(shm, counter_addr) == PR_FAILURE) {
    fprintf(stderr, "PR_DetachSharedMemory failed\n");
    exit(1);
  }
  if (PR_CloseSharedMemory(shm) == PR_FAILURE) {
    fprintf(stderr, "PR_CloseSharedMemory failed\n");
    exit(1);
  }
  if (PR_CloseSemaphore(sem1) == PR_FAILURE) {
    fprintf(stderr, "PR_CloseSemaphore failed\n");
  }
  if (PR_CloseSemaphore(sem2) == PR_FAILURE) {
    fprintf(stderr, "PR_CloseSemaphore failed\n");
  }
  printf("PASS\n");
  return 0;
}