From 4760ad7c5a4f9a6db8c7adb5af8c10a27badb199 Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Sun, 13 Dec 2015 02:24:43 -0500
Subject: Added OS X building. Go 1.5 required because of
 https://github.com/golang/go/issues/9411 which affects this. Also set up
 proper multithreading on OS X. Currently crashes due to similar issue I've
 had with libui.

---
 README.md       |  2 +-
 link_darwin.go  | 22 ++++++++++++++++++++++
 link_unix.go    |  4 ++++
 link_windows.go |  4 ++++
 main.go         |  2 +-
 5 files changed, 32 insertions(+), 2 deletions(-)
 create mode 100644 link_darwin.go

diff --git a/README.md b/README.md
index 186107d..8b028e3 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ It runs on/requires:
 - Mac OS X: cgo, Mac OS X 10.7 and newer
 - other Unixes: cgo, GTK+ 3.4 and newer
 
-TODO figure out the minimum required version of Go
+It also requires Go 1.5 or newer (due to various bugs in cgo that were fixed only starting with 1.5).
 
 (this README needs some work)
 
diff --git a/link_darwin.go b/link_darwin.go
new file mode 100644
index 0000000..c1d1a20
--- /dev/null
+++ b/link_darwin.go
@@ -0,0 +1,22 @@
+// 13 december 2015
+
+package ui
+
+// #cgo LDFLAGS: -L${SRCDIR} -lui -framework CoreFoundation -lpthread
+// #include <CoreFoundation/CoreFoundation.h>
+// #include <pthread.h>
+// extern void _CFRunLoopSetCurrent(CFRunLoopRef);
+// extern pthread_t _CFMainPThread;
+import "C"
+
+// OS X cares very deeply if we don't run on the very first thread the OS creates
+// why? who knows. it's stupid and completely indefensible. let's use undocumented APIs to get around it.
+// apple uses them too: http://www.opensource.apple.com/source/kext_tools/kext_tools-19.2/kextd_main.c?txt
+// apple HAS SUGGESTED them too: http://lists.apple.com/archives/darwin-development/2002/Sep/msg00250.html
+// gstreamer uses them too: http://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/sys/osxvideo/osxvideosink.m
+func ensureMainThread() {
+	// TODO set to nil like the apple code?
+	C._CFRunLoopSetCurrent(C.CFRunLoopGetMain())
+	// TODO is this part necessary?
+	C._CFMainPThread = C.pthread_self()
+}
diff --git a/link_unix.go b/link_unix.go
index 597dc44..e06cb12 100644
--- a/link_unix.go
+++ b/link_unix.go
@@ -7,3 +7,7 @@ package ui
 
 // #cgo LDFLAGS: -L${SRCDIR} -lui -Wl,-rpath=$ORIGIN
 import "C"
+
+func ensureMainThread() {
+	// do nothing; GTK+ doesn't care which thread we're on so long as we don't change it after starting
+}
diff --git a/link_windows.go b/link_windows.go
index b385907..279d3a2 100644
--- a/link_windows.go
+++ b/link_windows.go
@@ -4,3 +4,7 @@ package ui
 
 // #cgo LDFLAGS: -L${SRCDIR} -lui
 import "C"
+
+func ensureMainThread() {
+	// do nothing; Windows doesn't care which thread we're on so long as we don't change it after starting
+}
diff --git a/main.go b/main.go
index c7cb51a..5f8f624 100644
--- a/main.go
+++ b/main.go
@@ -40,7 +40,7 @@ func Main(f func()) error {
 func start(errchan chan error, f func()) {
 	runtime.LockOSThread()
 
-	// TODO set main thread on OS X
+	ensureMainThread()
 
 	// TODO HEAP SAFETY
 	opts := C.uiInitOptions{}
-- 
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