80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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/*
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//ce bloc de code vient d'un exercice de tp que j'ai recuperer
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int set_signal_handler(int signo, void (*handler)(int)) {
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struct sigaction sa;
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sa.sa_handler = handler; // call `handler` on signal
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sigemptyset(&sa.sa_mask); // don't block other signals in handler
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sa.sa_flags = SA_RESTART; // restart system calls
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return sigaction(signo, &sa, NULL);
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}
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void sig_hand(int sig) {
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}*/
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void commander_une_pizza(int* p){
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int i;
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printf("pizza ordered!\n");
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for (i=1; i<=8; i++){
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write(p[1],&i,sizeof(int));
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}
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printf("pizza delivered!\n");
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//kill(getppid(), SIGUSR1);
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}
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void prendre_une_part_de_pizza(int numEtudiant, int* p){
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int numPartPizza;
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read(p[0],&numPartPizza,sizeof(int));
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printf("student %d takes piece %d\n",numEtudiant, numPartPizza);
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//rendre atomique cette partie (mais je n'y arrive pas)
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if (numPartPizza == 8){
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commander_une_pizza(p);
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}
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else{
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//kill(getppid(), SIGUSR1);
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}
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}
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void reviser_et_manger_la_part_de_pizza(void){
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sleep(3);
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}
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int main(int argc, char ** argv){
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int Nbetudiant;
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int i;
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int pid;
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int p[2];
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if (argc != 2) {
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printf("Usage: %s <NbEtudiants>\n",argv[0]);
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exit(1);
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}
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Nbetudiant = strtol(argv[1],NULL,0);
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//set_signal_handler(SIGUSR1,sig_hand);
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pipe(p);
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commander_une_pizza(p);
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for (i=0; i<Nbetudiant; i++){
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pid = fork();
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if (pid == 0){
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while (1){
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prendre_une_part_de_pizza(i, p);
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reviser_et_manger_la_part_de_pizza();
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}
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}
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}
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while (1){
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// le professeur dort pendant que les eleves revises
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sleep(1);
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}
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}
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