chap4

bac2/os/chap4/group.c

@@ -0,0 +1,45 @@
+/***************************************************************************
+*  Le dinner des philosophes 											   * 
+*  Two phase locking: 													   *
+*  - array de baguettes													   * 
+*  - manger(): tente l'acquisition des deux. attente passive si non dispo  *
+****************************************************************************/
+#include <pthread.h>
+#include <unistd.h>
+#include <stdlib.h>
+#define TABLE_SIZE 5
+
+#define RIGHT(x) ((x)) % TABLE_SIZE
+#define LEFT(x) ((x)+1) % TABLE_SIZE
+
+typedef unsigned int PHILOSOPHE; // philosophe's id in the table
+
+pthread_mutex_t baguettes[TABLE_SIZE], tableLock;
+int main(void)
+{
+
+}
+
+void penser(){
+	usleep(100 + rand() % 500);
+}
+
+void manger(){
+	usleep(100 + rand() % 500);
+}
+
+void prendre(){
+
+}
+void deposer(){
+
+}
+
+void* thread_philosophe(void* arg){
+	while(42){
+		penser();
+		prendre();
+		manger();
+		deposer();
+	}
+}