#include "headers.h"
/* error checking left out for legibility */
/* stuff to pass into thread */
typedef struct thread_arg {
  int* id;
  char* str;
  float cost; } arg_t;
/* stuff thread returns      */
typedef struct thread_val {
  int id;
  float cost; } val_t;
/* thing thread does         */
void *entry_point(void *ptr);
int main(int argc,  char *argv[]){
  pthread_t thread_id;
  arg_t     thread_arg;
  val_t     *thread_val;
  int       local = 7;
  char str[] = "Me be threaded: %d %f!!\n";
  fprintf(stderr, "local is now = %d\n", local);
  thread_arg.id = &local;
  thread_arg.str = str;
  thread_arg.cost = 3.14;
  pthread_create(&thread_id,NULL,entry_point, &thread_arg);
  pthread_join(thread_id,(void **)&thread_val);
  fprintf(stderr,
          "the thread produced: %d  %f\n",
          thread_val->id,
          thread_val->cost);
  fprintf(stderr, "local is now = %d\n", local);
  exit(EXIT_SUCCESS);
}
void *entry_point(void *arg){
  arg_t input;
  val_t *output;
  input = *((arg_t *)arg);
  output = (val_t *)malloc(sizeof(val_t));
  fprintf(stderr, input.str, *input.id, input.cost);
  (*input.id)++;
  output->id   = *input.id;
  output->cost = input.cost * (*input.id);
  pthread_exit(output);
}