commtech: Add a new calculation method

This calculation performs only a loop and avoid cache pollution

communication_techniques/Makefile

@@ -33,7 +33,7 @@ CC=gcc
 
 # Files
 BINNAMES:=asm_cache_comm c_cache_comm pipe_comm shared_mem_comm shared_mem_opt_comm jikes_barrier_comm fake_comm
-CALCLIBSNAMES:=calc_mat
+CALCLIBSNAMES:=calc_mat calc_useless_loop
 BINS:=$(patsubst %,$(BINDIR)/%,$(BINNAMES))
 CALCLIBS:=$(patsubst %,$(LIBDIR)/$(CALCDIR)/lib%.so.1,$(CALCLIBSNAMES))
 MAIN_OBJS:=main.o

communication_techniques/src/calculation/calc_useless_loop.c

@@ -0,0 +1,27 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+
+static int nb_loop = 0, prod = 0, *prod_ptr = &prod;
+
+int init_calc(int param_nb_loop)
+{
+	nb_loop = param_nb_loop;
+	srand((unsigned int) time(NULL));
+	return 0;
+}
+
+void **do_calc(void)
+{
+	int i;
+
+	for(i = 0; i < nb_loop; i++)
+		prod += rand();
+	return (void **) &prod_ptr;
+}
+
+int end_calc(void)
+{
+	return 0;
+}