/* 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 EXE_NAME "semapong"
#define SEM_MODE 0666
#define SHM_MODE 0666
#define ITERATIONS 1000

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

static void Help(void) {
  fprintf(stderr, "semaping 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) {
  PRProcess* proc;
  PRIntn i;
  char* child_argv[32];
  char** child_arg;
  char iterations_buf[32];
  PRSharedMemory* shm;
  PRIntn* counter_addr;
  PRInt32 exit_code;
  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);

  if (PR_DeleteSharedMemory(SHM_NAME) == PR_SUCCESS) {
    fprintf(stderr,
            "warning: removed shared memory %s left over "
            "from previous run\n",
            SHM_NAME);
  }
  if (PR_DeleteSemaphore(SEM_NAME1) == PR_SUCCESS) {
    fprintf(stderr,
            "warning: removed semaphore %s left over "
            "from previous run\n",
            SEM_NAME1);
  }
  if (PR_DeleteSemaphore(SEM_NAME2) == PR_SUCCESS) {
    fprintf(stderr,
            "warning: removed semaphore %s left over "
            "from previous run\n",
            SEM_NAME2);
  }

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

  child_arg = &child_argv[0];
  *child_arg++ = EXE_NAME;
  if (debug_mode != PR_FALSE) {
    *child_arg++ = "-d";
  }
  if (iterations != ITERATIONS) {
    *child_arg++ = "-c";
    PR_snprintf(iterations_buf, sizeof(iterations_buf), "%d", iterations);
    *child_arg++ = iterations_buf;
  }
  *child_arg = NULL;
  proc = PR_CreateProcess(child_argv[0], child_argv, NULL, NULL);
  if (NULL == proc) {
    fprintf(stderr, "PR_CreateProcess failed\n");
    exit(1);
  }

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

  if (PR_WaitProcess(proc, &exit_code) == PR_FAILURE) {
    fprintf(stderr, "PR_WaitProcess failed\n");
    exit(1);
  }
  if (exit_code != 0) {
    fprintf(stderr, "process 2 failed with exit code %d\n", exit_code);
    exit(1);
  }

  if (PR_DeleteSharedMemory(SHM_NAME) == PR_FAILURE) {
    fprintf(stderr, "PR_DeleteSharedMemory failed\n");
  }
  if (PR_DeleteSemaphore(SEM_NAME1) == PR_FAILURE) {
    fprintf(stderr, "PR_DeleteSemaphore failed\n");
  }
  if (PR_DeleteSemaphore(SEM_NAME2) == PR_FAILURE) {
    fprintf(stderr, "PR_DeleteSemaphore failed\n");
  }
  printf("PASS\n");
  return 0;
}