From 6ab76a1e9bfd072e74b9ac32c7727941639e78e2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20Ortega=20Froysa?=
 <naortega@themusicinnoise.net>
Date: Sun, 10 May 2020 11:13:08 +0200
Subject: [PATCH] Use OpenMP.

---
 Makefile   | 4 ++--
 src/main.c | 8 ++++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index c999d3d..0f22c5e 100644
--- a/Makefile
+++ b/Makefile
@@ -18,9 +18,9 @@ CC=gcc
 DEBUG=0
 PREFIX=/usr/local
 INCFLAGS=
-LDFLAGS=-lm
+LDFLAGS=-lm -fopenmp
 DEFS=-DVERSION=\"1.0\"
-CFLAGS=$(INCFLAGS) -std=c99 -Wall -Wextra -Wfatal-errors -Werror
+CFLAGS=$(INCFLAGS) -std=c99 -Wall -Wextra -Wfatal-errors -Werror -fopenmp
 HDRS=
 OBJS=src/main.o
 
diff --git a/src/main.c b/src/main.c
index da38087..b0e3a68 100644
--- a/src/main.c
+++ b/src/main.c
@@ -20,6 +20,7 @@
 #include <stdlib.h>
 #include <math.h>
 #include <string.h>
+#include <omp.h>
 
 int main(int argc, char *argv[]) {
 	if(argc < 2)
@@ -48,11 +49,14 @@ int main(int argc, char *argv[]) {
 		return 1;
 	unsigned long long int test_root = sqrt(test_num);
 
+	int not_prime = 0;
+
+	#pragma omp parallel for
 	for(unsigned long long int i = 3; i < test_root; i += 2)
 	{
 		if(test_num % i == 0)
-			return 1;
+			not_prime = 1;
 	}
 
-	return 0;
+	return not_prime;
 }