Implemented Post() on Mac OS X.

delegateuitask_darwin.m

@@ -56,6 +56,13 @@ extern NSRect dummyRect;
 
 @implementation appDelegate
 
+- (void)uipost:(id)pv
+{
+	NSValue *v = (NSValue *) pv;
+
+	appDelegate_uipost([v pointerValue]);
+}
+
 - (BOOL)windowShouldClose:(id)win
 {
 	return appDelegate_windowShouldClose(win);
@@ -123,6 +130,18 @@ BOOL initCocoa(id appDelegate)
 	return YES;
 }
 
+void uipost(id appDelegate, void *data)
+{
+	// need an autorelease pool here
+	NSAutoreleasePool *pool;
+
+	pool = [NSAutoreleasePool new];
+	[appDelegate performSelectorOnMainThread:@selector(uipost:)
+		withObject:[NSValue valueWithPointer:data]
+		waitUntilDone:YES];		// note this bit; see uitask_darwin.go for details
+	[pool release];
+}
+
 void breakMainLoop(void)
 {
 	NSEvent *e;

objc_darwin.h

@@ -63,6 +63,7 @@ extern uintptr_t keyCode(id);
 extern id makeAppDelegate(void);
 extern id windowGetContentView(id);
 extern BOOL initCocoa(id);
+extern void uipost(id, void *);
 extern void breakMainLoop(void);
 extern void cocoaMainLoop(void);
 

uitask_darwin.go

@@ -4,6 +4,7 @@ package ui
 
 import (
 	"fmt"
+	"unsafe"
 )
 
 // #cgo CFLAGS: -mmacosx-version-min=10.7 -DMACOSX_DEPLOYMENT_TARGET=10.7
@@ -32,6 +33,28 @@ func ui() {
 	C.cocoaMainLoop()
 }
 
+// we're going to call the appDelegate selector with waitUntilDone:YES so we don't have to worry about garbage collection
+// we DO need to collect the two pointers together, though
+
+type uipostmsg struct {
+	w		*Window
+	data		interface{}
+}
+
+//export appDelegate_uipost
+func appDelegate_uipost(xmsg unsafe.Pointer) {
+	msg := (*uipostmsg)(xmsg)
+	msg.w.sysData.post(msg.data)
+}
+
+func uipost(w *Window, data interface{}) {
+	msg := &uipostmsg{
+		w:		w,
+		data:		data,
+	}
+	C.uipost(appDelegate, unsafe.Pointer(msg))
+}
+
 func initCocoa() (err error) {
 	makeAppDelegate()
 	if C.initCocoa(appDelegate) != C.YES {