#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
#include <cstdlib>

typedef struct {
  int delay;
  void* (*targetFunc)(void*);
  void* arg;
} TimerParams;

void* threadHelper(void* arg)
{
  TimerParams* t = (TimerParams*)arg;

  sleep(t->delay);
  t->targetFunc(t->arg);

  free(t);
  return(0); // TODO: get the return value from the function?
}


int addTimer(int delay, void* (*targetFunc)(void*), void* arg)
{
  printf("Adding a timer...\n");

  TimerParams* t = (TimerParams*) malloc(sizeof(TimerParams));

  t->delay = delay;
  t->targetFunc = targetFunc;
  t->arg = arg;

  pthread_t thread;
  return pthread_create(&thread, NULL, threadHelper, (void*)t);
}

//---- User interface code below here

void* sayMessage(void* msg)
{
  printf("%s\n", (char*)msg);

  return 0;
}


int main(int argc, char* argv[])
{
  addTimer(3, sayMessage, (void*)"This is the first message");
  addTimer(3, sayMessage, (void*)"This is the second message");
  addTimer(3, sayMessage, (void*)"I'm the last one!!!");


  // Quit main while allowing other threads to finish up
  pthread_exit(NULL);
}