From 6eb1ca1dd4b0bda6433923a65ab9e1ed3b268c10 Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Wed, 5 Apr 2017 23:15:05 +0200
Subject: Multithread on windows

---
 attract.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/attract.c b/attract.c
index 9209a16..5ac8094 100644
--- a/attract.c
+++ b/attract.c
@@ -10,6 +10,19 @@
 #include <assert.h>
 #include "lodepng.h"
 
+#ifdef _WIN32
+#include <windows.h>
+int number_of_cores(void){
+	SYSTEM_INFO sysinfo;
+	GetSystemInfo(&sysinfo);
+	return sysinfo.dwNumberOfProcessors;
+}
+#else
+int number_of_cores(void){
+	return sysconf(_SC_NPROCESSORS_ONLN);
+}
+#endif
+
 #ifndef CMPLX
 #define CMPLX(r,i) ((r) + (i)*I)
 #endif
@@ -134,8 +147,8 @@ static void* thread_entry(void *arg_vp){
 }
 
 int main(int argc,char **argv){
-	const double minx=-1.5,miny=-1.5;
-	const double maxx=1.5,maxy=1.5;
+	const double minx=-0.3,miny=0.6;
+	const double maxx=-0.1,maxy=0.8;
 	const double width=1000;
 
 	struct config cfg={
@@ -165,9 +178,9 @@ int main(int argc,char **argv){
 
 	unsigned char *img=malloc(cfg.width*cfg.height*3);
 
-	int nthreads=sysconf(_SC_NPROCESSORS_ONLN);
-	if(nthreads==4)nthreads/=2;
+	int nthreads=number_of_cores();
 	if(nthreads>=999||nthreads<1)nthreads=1;
+	// nthreads=1;
 	fprintf(stderr,"Using %d thread%s\n",nthreads,nthreads==1?"":"s");
 
 
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