X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=philosophe%2Fphilosophe.c;fp=philosophe%2Fphilosophe.c;h=72b740ed762370407ce8f6334fc0f9dc2b7ac04c;hb=912658502558d4881fceed04e0fdda7574f4af13;hp=0000000000000000000000000000000000000000;hpb=66c9107fcb99df4eec36a84db41f78eb946cc224;p=TD_SE.git

diff --git a/philosophe/philosophe.c b/philosophe/philosophe.c
new file mode 100644
index 0000000..72b740e
--- /dev/null
+++ b/philosophe/philosophe.c
@@ -0,0 +1,56 @@
+// programme philosophe.c
+#include <stdio.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <semaphore.h>
+
+#define N 5
+// nombre de philosophes
+#define G (i + 1) % N
+// fourchette gauche du philosophe i
+#define D i
+// fourchette droite du philosophe i
+#define libre 1
+#define occupe 0
+int fourch[N] = { libre, libre, libre, libre, libre };
+
+sem_t mutex;
+
+void *philosophe(void *num)
+{
+	int i = *(int *)num, nb = 2;
+	while (nb) {
+		sleep(1);	// penser
+		sem_wait(&mutex);	// essayer de prendre les fourchettes pour manger
+		if (fourch[G] == libre && fourch[D] == libre) {
+			fourch[G] = occupe;
+			fourch[D] = occupe;
+			sem_post(&mutex);
+			nb--;
+			printf("philosophe[%d] mange\n", i);
+			sleep(1);	// manger
+			printf("philosophe[%d] a fini de manger\n", i);
+			sem_wait(&mutex);	// libérer les fourchettes
+			fourch[G] = libre;
+			fourch[D] = libre;
+			sem_post(&mutex);
+		} else
+			sem_post(&mutex);
+	}
+	return NULL;
+}
+
+int main()
+{
+	int i, NumPhi[N] = { 0, 1, 2, 3, 4 };
+	pthread_t th[N];
+	sem_init(&mutex, 0, 1);
+	// création des N philosophes
+	for (i = 0; i < N; i++)
+		pthread_create(&th[i], NULL, philosophe, &NumPhi[i]);
+	// attendre la fin des threads
+	for (i = 0; i < N; i++)
+		pthread_join(th[i], NULL);
+	printf("fin des threads \n");
+	return 0;
+}