+++ /dev/null
-/* $Id$ */
-
-/* philosopher - classical dinning philosopher as a demo xbt syncro stuff */
-
-/* Copyright (c) 2007 Martin Quinson. All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-#include "gras.h"
-#include "xbt/synchro.h"
-
-XBT_LOG_NEW_DEFAULT_CATEGORY(philo, "Logs of this example");
-
-
-/** Philosopher logic **/
-int lunch_amount = 10;
-int philosopher_amount;
-
-xbt_mutex_t mutex;
-xbt_cond_t *forks;
-
-#define THINKING 0
-#define EATING 1
-int *state;
-
-int *id; /* to pass a pointer to the threads without race condition */
-
-static void pickup(int id, int lunch)
-{
- INFO2("Thread %d gets hungry (lunch #%d)", id, lunch);
- xbt_mutex_acquire(mutex);
- while (state[(id + (philosopher_amount - 1)) % philosopher_amount] == EATING
- || state[(id + 1) % philosopher_amount] == EATING) {
- xbt_cond_wait(forks[id], mutex);
- }
-
- state[id] = EATING;
- xbt_assert1(state[(id + (philosopher_amount - 1)) % philosopher_amount] ==
- THINKING
- && state[(id + 1) % philosopher_amount] == THINKING,
- "Philosopher %d eats at the same time that one of its neighbors!!!",
- id);
-
- xbt_mutex_release(mutex);
- INFO1("Thread %d eats", id);
-}
-
-static void putdown(int id)
-{
- INFO1("Thread %d is full", id);
- xbt_mutex_acquire(mutex);
- state[id] = THINKING;
- xbt_cond_signal(forks
- [(id + (philosopher_amount - 1)) % philosopher_amount]);
- xbt_cond_signal(forks[(id + 1) % philosopher_amount]);
-
- xbt_mutex_release(mutex);
- INFO1("Thread %d thinks", id);
-}
-
-/*
- * Some additionnal code to let the father wait the childs
- */
-xbt_mutex_t mut_end;
-xbt_cond_t cond_end;
-int running_threads;
-
-xbt_mutex_t dead_end;
-
-/* Code ran by each thread */
-static void philo_thread(void *arg)
-{
- int id = *(int *) arg;
- int i;
-
- for (i = 0; i < lunch_amount; i++) {
- pickup(id, i);
- gras_os_sleep(id / 100.0); /* each philosopher sleeps and eat a time related to its ID */
- putdown(id);
- gras_os_sleep(id / 100.0);
- }
-
- xbt_mutex_acquire(mut_end);
- running_threads--;
- xbt_cond_signal(cond_end);
- xbt_mutex_release(mut_end);
-
- /* Enter an endless loop to test the killing facilities */
- INFO1
- ("Thread %d tries to enter the dead-end; hopefully, the master will cancel it",
- id);
- xbt_mutex_acquire(dead_end);
- INFO1("Oops, thread %d reached the dead-end. Cancelation failed", id);
-}
-
-int philosopher(int argc, char *argv[]);
-int philosopher(int argc, char *argv[])
-{
- int i;
- xbt_thread_t *philosophers;
-
- gras_init(&argc, argv);
- xbt_assert0(argc >= 2,
- "This program expects one argument (the amount of philosophers)");
-
- /* initializations of the philosopher mecanisms */
- philosopher_amount = atoi(argv[1]);
- state = xbt_new0(int, philosopher_amount);
- id = xbt_new0(int, philosopher_amount);
- forks = xbt_new(xbt_cond_t, philosopher_amount);
- philosophers = xbt_new(xbt_thread_t, philosopher_amount);
-
- mutex = xbt_mutex_init();
- for (i = 0; i < philosopher_amount; i++) {
- state[i] = THINKING;
- id[i] = i;
- forks[i] = xbt_cond_init();
- }
-
- /* setup the ending mecanism */
- running_threads = philosopher_amount;
- cond_end = xbt_cond_init();
- mut_end = xbt_mutex_init();
- dead_end = xbt_mutex_init();
- xbt_mutex_acquire(dead_end);
-
- INFO2("Spawn the %d threads (%d lunches scheduled)", philosopher_amount,
- lunch_amount);
- /* spawn threads */
- for (i = 0; i < philosopher_amount; i++) {
- char *name = bprintf("thread %d", i);
- philosophers[i] = xbt_thread_create(name, philo_thread, &id[i]);
- free(name);
- }
-
- /* wait for them */
- xbt_mutex_acquire(mut_end);
- while (running_threads)
- xbt_cond_wait(cond_end, mut_end);
- xbt_mutex_release(mut_end);
-
- INFO0("Cancel all childs");
- /* nuke them threads */
- for (i = 0; i < philosopher_amount; i++) {
- xbt_thread_cancel(philosophers[i]);
- }
-
- xbt_mutex_release(dead_end);
- gras_exit();
- return 0;
-}
