From c94ef353dd2a8392ec5dbbfe1d345945acde7d20 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jos=C3=A9=20Fonseca?= <jose.r.fonseca@gmail.com>
Date: Wed, 24 Oct 2012 13:57:02 +0100
Subject: [PATCH] Force Cocoa to enter multithreaded mode.

---
 retrace/glws_cocoa.mm | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/retrace/glws_cocoa.mm b/retrace/glws_cocoa.mm
index df7dd84..e410862 100644
--- a/retrace/glws_cocoa.mm
+++ b/retrace/glws_cocoa.mm
@@ -33,6 +33,8 @@
  * - http://developer.apple.com/library/mac/#samplecode/glut/Introduction/Intro.html
  * - http://developer.apple.com/library/mac/#samplecode/GLEssentials/Introduction/Intro.html
  * - http://www.glfw.org/
+ * - http://cocoasamurai.blogspot.co.uk/2008/04/guide-to-threading-on-leopard.html
+ * - http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/Multithreading/Introduction/Introduction.html
  */
 
 
@@ -48,6 +50,27 @@
 #include "glws.hpp"
 
 
+/**
+ * Dummy thread to force Cocoa to enter multithreading mode.
+ */
+@interface DummyThread : NSObject
+    + (void)enterMultiThreaded;
+    + (void)dummyThreadMethod:(id)unused;
+@end
+
+@implementation DummyThread
+    + (void)dummyThreadMethod:(id)unused {
+        (void)unused;
+    }
+
+    + (void)enterMultiThreaded {
+        [NSThread detachNewThreadSelector:@selector(dummyThreadMethod:)
+                  toTarget:self
+                  withObject:nil];
+    }
+@end
+
+
 namespace glws {
 
 
@@ -174,6 +197,14 @@ init(void) {
 
     initThread();
 
+    [DummyThread enterMultiThreaded];
+
+    bool isMultiThreaded = [NSThread isMultiThreaded];
+    if (!isMultiThreaded) {
+        std::cerr << "error: failed to enable Cocoa multi-threading\n";
+	exit(1);
+    }
+
     [NSApplication sharedApplication];
 
     [NSApp finishLaunching];
-- 
2.43.0