/*
 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
 *	The President and Fellows of Harvard College.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Thread test code.
 */
#include <types.h>
#include <lib.h>
#include <thread.h>
#include <synch.h>
#include <test.h>

#define NTHREADS 8

static struct semaphore *tsem = NULL;

static void init_sem(void) {
  if (tsem == NULL) {
    tsem = sem_create("tsem", 0);
    if (tsem == NULL) {
      panic("threadtest: sem_create failed\n");
    }
  }
}

static void loudthread(void *junk, unsigned long num) {
  int ch = '0' + num;
  int i;

  (void)junk;

  for (i = 0; i < 120; i++) {
    putch(ch);
  }
  V(tsem);
}

/*
 * The idea with this is that you should see
 *
 *   01234567 <pause> 01234567
 *
 * (possibly with the numbers in different orders)
 *
 * The delay loop is supposed to be long enough that it should be clear
 * if either timeslicing or the scheduler is not working right.
 */
static void quietthread(void *junk, unsigned long num) {
  int ch = '0' + num;
  volatile int i;

  (void)junk;

  putch(ch);
  for (i = 0; i < 200000; i++)
    ;
  putch(ch);

  V(tsem);
}

static void runthreads(int doloud) {
  char name[16];
  int i, result;

  for (i = 0; i < NTHREADS; i++) {
    snprintf(name, sizeof(name), "threadtest%d", i);
    result =
        thread_fork(name, NULL, doloud ? loudthread : quietthread, NULL, i);
    if (result) {
      panic("threadtest: thread_fork failed %s)\n", strerror(result));
    }
  }

  for (i = 0; i < NTHREADS; i++) {
    P(tsem);
  }
}

int threadtest(int nargs, char **args) {
  (void)nargs;
  (void)args;

  init_sem();
  kprintf("Starting thread test...\n");
  runthreads(1);
  kprintf("\nThread test done.\n");

  return 0;
}

int threadtest2(int nargs, char **args) {
  (void)nargs;
  (void)args;

  init_sem();
  kprintf("Starting thread test 2...\n");
  runthreads(0);
  kprintf("\nThread test 2 done.\n");

  return 0;
}
