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

#define NB_THREADS 5
#define MSG "hello\n"

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
FILE *fh;

void write_f() {
	pthread_mutex_lock(&mutex);
	
	fh = fopen("tthread.txt","a+");
	fputs(MSG,fh);
	fclose(fh);
	
	pthread_mutex_unlock(&mutex);
}

void *fonction() {
	int tid, result;
	tid = (int)pthread_self();
	
	printf("Thread %d : writing file...\n",tid);
	write_f();
	printf("Thread %d : write done.\n",tid);
	
	result = 2;
	pthread_exit((void *)result);
}

int main() {
	int i;
	void *retour;
	pthread_t thread[NB_THREADS];
	
	printf("Test thread program\n");
	
	for(i=0;i<NB_THREADS;i++) {
		pthread_create(&thread[i],NULL,fonction,NULL);
	}
	
	for(i=0;i<NB_THREADS;i++) {
		pthread_join(thread[i],&retour);
		printf("thread main : thread %d finished (result : %d)\n",(int)thread[i],(int)retour);
	}
	
	pthread_exit(NULL);
}