#include <limits.h>
#include <proc/local.h>
#include <proc/proc.h>
#include <stddef.h>
#include <stdint.h>
#include <string/string.h>

#define MUTEX 2000

LOCAL volatile char letter = 'c';

void app_proc (void) {
  char arg_letter = (char)(uintptr_t)argument_ptr ();

  letter = arg_letter;

  for (;;) {
    mutex_lock (MUTEX);

    for (int i = 0; i < 3; i++)
      test (letter);

    mutex_unlock (MUTEX);
  }

  process_quit ();
}

void app_main (void) {
  mutex_create (MUTEX);

  letter = 'a';

  process_spawn (&app_proc, (void*)'a');
  process_spawn (&app_proc, (void*)'b');
  process_spawn (&app_proc, (void*)'c');

  for (;;) {
    mutex_lock (MUTEX);

    for (int i = 0; i < 3; i++)
      test (letter);

    mutex_unlock (MUTEX);
  }
}