diff --git a/SCR/SCR3.1/TP04/helpers.c b/SCR/SCR3.1/TP04/helpers.c
new file mode 100644
index 0000000..718fe40
--- /dev/null
+++ b/SCR/SCR3.1/TP04/helpers.c
@@ -0,0 +1,19 @@
+#include "helpers.h"
+#include <signal.h>
+#include <time.h>
+
+int set_signal_handler(int signo, void (*handler)(int)) {
+    struct sigaction sa;
+    sa.sa_handler = handler;    // call `handler` on signal
+    sigemptyset(&sa.sa_mask);   // don't block other signals in handler
+    sa.sa_flags = SA_RESTART;            //  restart system calls
+    return sigaction(signo, &sa, NULL);
+}
+
+double tstamp(void) {                                                                                    
+	struct timespec tv;
+	clock_gettime(CLOCK_REALTIME, &tv);
+	return tv.tv_sec + tv.tv_nsec * 1.0e-9;
+}
+
+
diff --git a/SCR/SCR3.1/TP04/helpers.h b/SCR/SCR3.1/TP04/helpers.h
new file mode 100644
index 0000000..2084c6a
--- /dev/null
+++ b/SCR/SCR3.1/TP04/helpers.h
@@ -0,0 +1,7 @@
+#ifndef _HELPERS_H
+#define _HELPERS_H
+
+int set_signal_handler(int signo, void (*handler)(int));
+double tstamp(void);
+
+#endif
diff --git a/SCR/SCR3.1/TP04/mes.txt b/SCR/SCR3.1/TP04/mes.txt
new file mode 100644
index 0000000..d602d88
--- /dev/null
+++ b/SCR/SCR3.1/TP04/mes.txt
@@ -0,0 +1 @@
+ALIVE !
diff --git a/SCR/SCR3.1/TP04/pi.c b/SCR/SCR3.1/TP04/pi.c
new file mode 100644
index 0000000..995e0ef
--- /dev/null
+++ b/SCR/SCR3.1/TP04/pi.c
@@ -0,0 +1,36 @@
+#include<unistd.h>
+#include<stdio.h>
+#include<stdlib.h>
+#include<signal.h>
+#include<stdint.h>
+#include<assert.h>
+#include "helpers.h"
+
+
+uint64_t shots = 0,
+		 shots_in = 0;
+
+double pi = 0,
+	   t1;
+
+void onAlarmSent(double pi, uint64_t shots) {
+	printf("Pi value = %f, Shots value = %lu", pi, shots);
+}
+
+int main(int argc,char * argv[])
+{
+	double x,y;
+	t1 = tstamp();
+
+	set_signal_handler(SIGALRM, onAlarmSent);
+	alarm(5);
+
+	while(1){
+		x = ((double)rand())/(double)RAND_MAX;
+		y = ((double)rand())/(double)RAND_MAX;
+		shots ++;
+
+		if ((x*x+y*y) <= 1) 
+			shots_in ++;
+	}
+}