first commit

ANALE-1/SUJET/Makefile

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+CFLAGS=-Wall -Wextra -g
+OBJS=p1.o p2.o p3.o dijkstra.o launcher.o
+all: p1 p2 p3 launcher
+
+p1: p1.o dijkstra.o
+p2: p2.o dijkstra.o
+p3: p3.o dijkstra.o
+launcher: launcher.o dijkstra.o
+
+p1.o: p1.c dijkstra.h commun.h
+p2.o: p2.c dijkstra.h commun.h
+p3.o: p3.c dijkstra.h commun.h
+launcher.o: launcher.c dijkstra.h commun.h
+dijkstra.o: dijkstra.c dijkstra.h
+
+.PHONY: clean
+clean:
+	rm $(OBJS) p1 p2 p3 launcher
+

ANALE-1/SUJET/commun.h

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+#ifndef COMMUN_H
+#define COMMUN_H
+
+#endif

ANALE-1/SUJET/dijkstra.c

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+#include <sys/sem.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "dijkstra.h"
+
+int sem_create(key_t cle, int initval) {
+	int semid;
+	union semun { int val; struct semid_ds *buf; ushort *array; } arg_ctl;
+
+	semid = semget(cle, 1 , IPC_CREAT|IPC_EXCL|0666);
+	if (semid == -1) 
+	{
+		semid = semget(cle,1, 0666);
+		if (semid == -1) 
+		{
+			perror("Erreur semget()"); 
+			exit(1);
+		}
+	}
+	else 
+	{ 
+		arg_ctl.val = initval;
+		if (semctl(semid, 0, SETVAL, arg_ctl) == -1) 
+		{
+			perror("Erreur initialisation sémaphore"); 
+			exit(1);
+		}
+	}
+	return(semid) ;
+}
+
+void P(int semid) 
+{
+	struct sembuf sempar;
+	sempar.sem_num = 0;
+	sempar.sem_op = -1;
+	sempar.sem_flg = 0;
+	if (semop(semid, &sempar, 1) == -1) 
+		perror("Erreur operation P");
+}
+
+void V(int semid) 
+{
+	struct sembuf sempar;
+	sempar.sem_num = 0;
+	sempar.sem_op = 1;
+	sempar.sem_flg = 0;
+	if (semop(semid, &sempar, 1) == -1) 
+		perror("Erreur opération V");
+}
+
+void sem_delete(int semid) 
+{
+	if (semctl(semid,0,IPC_RMID,0) == -1) 
+		perror("Erreur dans destruction sémaphore");
+}

ANALE-1/SUJET/dijkstra.h

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+#ifndef DIJKSTRA_H
+#define DIJKSTRA_H
+
+#include <sys/sem.h>
+
+/**
+ * return the semaphore associated to the key cle
+ * if the semaphore doesn't already exist the function create it with initval token then return it
+ */
+int sem_create(key_t cle, int initval);
+
+/**
+ * take a token on the semaphore semid or wait if none available
+ */
+void P(int semid);
+
+/**
+ * put a token on the semaphore semid
+ */
+void V(int semid);
+
+/**
+ * delete the semaphore semid
+ */
+void sem_delete(int semid);
+
+#endif

ANALE-1/SUJET/launcher.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/shm.h>
+#include <sys/wait.h>
+#include <string.h>
+#include "dijkstra.h"
+#include "commun.h"
+
+int main () {
+    if (fork() == 0)
+    {
+        execlp("./p1","./p2",NULL);
+    }
+    if (fork() == 0)
+    {
+        execlp("./p2","./p2",NULL);
+    }
+    if (fork() == 0)
+    {
+        execlp("./p3","./p3",NULL);
+    }
+    wait(NULL);
+    wait(NULL);
+    wait(NULL);
+    return 0;
+}

ANALE-1/SUJET/p1.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/shm.h>
+#include "dijkstra.h"
+#include "commun.h"
+
+void t1()
+{
+    puts("t1");
+    sleep(10);
+    puts("end t1");
+}
+
+void t2()
+{
+    puts("t2");
+    sleep(2);
+    puts("end t2");
+}
+
+int main () {
+    t1();
+    t2();
+    return 0;
+}

ANALE-1/SUJET/p2.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/shm.h>
+#include "dijkstra.h"
+#include "commun.h"
+
+void t3()
+{
+    puts("t3");
+    sleep(7);
+    puts("end t3");
+}
+
+int main () {
+    t3();
+    return 0;
+}

ANALE-1/SUJET/p3.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/shm.h>
+#include "dijkstra.h"
+#include "commun.h"
+
+void t4()
+{
+    puts("t4");
+    sleep(5);
+    puts("end t4");
+}
+
+int main () {
+    t4();
+    return 0;
+}