/***********************************************************************\
   exemple_mutex
 
   Programme d'exemple du livre "Developpement systeme en C sous Linux"
   
   (c) 2000,2005 - Christophe Blaess
 
\***********************************************************************/

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


	static void * routine_threads (void * argument);
	static int    aleatoire (int maximum);

	pthread_mutex_t	mutex_stdout = PTHREAD_MUTEX_INITIALIZER;

	int
main (void)
{
	int		i;
	pthread_t	thread;
	
	for (i = 0; i < 10; i ++)
		pthread_create(& thread, NULL, routine_threads, (void *) i);
	sleep(1);
	pthread_exit NULL;
}

	static void *
routine_threads (void * argument)
{
	int numero = (int) argument;
	int nombre_iterations;
	int i;
	nombre_iterations = 1+aleatoire(3);
	for (i = 0; i < nombre_iterations; i ++) {
		sleep(aleatoire(3));
		pthread_mutex_lock(& mutex_stdout);
		fprintf(stdout, "Le thread %d a obtenu le mutex\n", numero);
		sleep(aleatoire(3));
		fprintf(stdout, "Le thread %d relāche le mutex\n", numero);
		pthread_mutex_unlock(& mutex_stdout);
	}
	return NULL;
}

	static int
aleatoire (int maximum)
{
	double d;
	d = (double) maximum * rand();
	d = d / (RAND_MAX + 1.0);
	return ((int) d);
}