#ifdef _WIN32
int main() {
  return 0;
}
#else
#  include "../kit/threads.h"

#  include <stdio.h>
#  include <string.h>
#  include <sys/mman.h>
#  include <sys/stat.h>
#  include <fcntl.h>
#  include <unistd.h>

#  define NAME "/kit_test_interprocess"

enum { STATE_INIT, STATE_READY, STATE_DONE };

enum { SIZE = 64 };

int run_writer() {
  int f = shm_open(NAME, O_RDWR | O_CREAT, 0660);

  if (f == -1) {
    printf("%s: shm_open failed.\n", __FUNCTION__);
    return 1;
  }

  if (ftruncate(f, SIZE) == -1) {
    printf("%s: ftruncate failed.\n", __FUNCTION__);
    fflush(stdout);
    return 1;
  }

  void *p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, f,
                 0);

  if (p == MAP_FAILED) {
    printf("%s: mmap failed.\n", __FUNCTION__);
    fflush(stdout);
    return 1;
  }

  unsigned char *bytes = (unsigned char *) p;

  bytes[0] = STATE_INIT;
  for (int i = 1; i < SIZE; i++) bytes[i] = i;
  bytes[0] = STATE_READY;

  while (bytes[0] != STATE_DONE) thrd_yield();

  shm_unlink(NAME);

  return 0;
}

int run_reader() {
  int f = -1;

  while (f == -1) {
    f = shm_open(NAME, O_RDWR, 0);
    thrd_yield();
  }

  void *p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, f,
                 0);

  if (p == MAP_FAILED) {
    printf("%s: mmap failed.\n", __FUNCTION__);
    fflush(stdout);
    return 1;
  }

  unsigned char *bytes = (unsigned char *) p;

  while (bytes[0] != STATE_READY) thrd_yield();

  int status = 0;

  for (int i = 1; i < SIZE; i++)
    if (bytes[i] != i) {
      printf("%s: wrong byte %d\n", __FUNCTION__, i);
      fflush(stdout);
      status = 1;
    }

  bytes[0] = STATE_DONE;

  return status;
}

int main(int argc, char **argv) {
  if (argc != 2) {
    printf("Wrong number of command line arguments %d\n", argc);
    return 1;
  }

  int status = 0;

  struct timespec t0;
  timespec_get(&t0, TIME_UTC);

  if (strcmp(argv[1], "writer") == 0)
    status = run_writer();
  else if (strcmp(argv[1], "reader") == 0)
    status = run_reader();
  else {
    printf("Invalid command line argument \"%s\"\n", argv[1]);
    return 1;
  }

  struct timespec t1;
  timespec_get(&t1, TIME_UTC);

  long long sec  = t1.tv_sec - t0.tv_sec;
  long long nsec = t1.tv_nsec - t0.tv_nsec;

  printf("%s: done in %.2lf msec\n", argv[1],
         (sec * 1000000000 + nsec) * 0.000001);
  fflush(stdout);

  return status;
}
#endif