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#include <stdio.h>
#include <stdlib.h>
#include <semaphore.h>
#include <time.h>
int g_alea(int i_min,int i_max);
int main(int argc,char **argv)
{
pid_t pid;
sem_t secretariat;
int N,i;
srand(time(NULL));
if(argc != 2)
return -1;
N = atoi(argv[1]);
sem_init(&secretariat,0,1);
for(i=1;i<=N;i++)
{
pid = fork();
if(pid > 0)
{
printf("nouveau\n");
sem_wait(&secretariat);
printf("secretariat pour %d\n",i);
sleep(g_alea(4,6));
printf("on sort\n");
sem_post(&secretariat);
wait(NULL);
}
else if(pid == 0)
{
sleep(g_alea(1,5));
printf("nouveau\n");
sem_wait(&secretariat);
printf("secretariat pour %d\n",i+1);
sleep(g_alea(4,6));
sem_post(&secretariat);
exit(0);
}
else
return -1;
}
return 0;
}
int g_alea(int i_min,int i_max)
{
int nb = i_max - i_min + 1;
int nb2 = rand() % nb;
return i_min + nb2;
} |
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