/*
 * CS460: Operating Systems
 * Jim Plank
 * threadpc2.c -- threaded producer/consumer driver program #2
 */

#include <stdio.h>
#include <lwp/lwp.h>
#include <lwp/check.h>
#include <lwp/lwpmachdep.h>
#include <lwp/stackdep.h>
#include <stdio.h>
#include "dlist.h"

extern struct inputstruct *read_input();
extern struct outputstruct *process_input();


produce(buffer)
Dlist buffer;
{
  struct inputstruct *input;
  struct outputstruct *output;

  while(1) {
    input = read_input();
    if (input == NULL) {
      output = NULL;
    } else {
      output = process_input();
    }
    dl_insert_b(buffer, output);
    lwp_yield(SELF);
    if (output == NULL) return;
  }
}

consume(buffer)
Dlist buffer;
{
  struct outputstruct *output;
  Dlist tmp;

  while(1) {
    while(dl_empty(buffer)) lwp_yield(SELF);
    tmp = buffer->flink;
    output = (struct outputstruct *) tmp->val;
    dl_delete_node(tmp);
    if (output == NULL) return;
    print_output(output);
  }
}

main()
{
  Dlist buffer;
  stkalign_t *pstack, *cstack;
  thread_t pt, ct;

  lwp_setstkcache(MINSTACKSZ*sizeof(stkalign_t), 2);

  buffer = make_dl();

  pstack = lwp_newstk();
  cstack = lwp_newstk();

  lwp_create(&pt, produce, 1, 0, pstack, 1, buffer);
  lwp_create(&ct, consume, 1, 0, cstack, 1, buffer);

  lwp_join(pt);
  lwp_join(ct);
  exit(1);
}