Migrated the Mac OS X backend to the new uitask system.

delegateuitask_darwin.m

@@ -56,11 +56,15 @@ extern NSRect dummyRect;
 
 @implementation appDelegate
 
-- (void)uitask:(NSValue *)fp
+// these are the uitask actions
+
+- (void)createWindow:(NSValue *)fp
 {
-	appDelegate_uitask([fp pointerValue]);
+	uitask_createWindow([fp pointerValue]);
 }
 
+// these are the other delegate functions
+
 - (BOOL)windowShouldClose:(id)win
 {
 	return appDelegate_windowShouldClose(win);
@@ -111,6 +115,9 @@ id windowGetContentView(id window)
 	return [((NSWindow *) window) contentView];
 }
 
+// these are for douitask() but are here because @selector() is not a constant expression
+SEL createWindow;
+
 BOOL initCocoa(id appDelegate)
 {
 	// on 10.6 the -[NSApplication setDelegate:] method complains if we don't have one
@@ -124,11 +131,13 @@ BOOL initCocoa(id appDelegate)
 		return NO;
 	[NSApp activateIgnoringOtherApps:YES];		// TODO actually do C.NO here? Russ Cox does YES in his devdraw; the docs say the Finder does NO
 	[NSApp setDelegate:appDelegate];
+	// uitask selectors
+	createWindow = @selector(createWindow:);
 	[pool release];
 	return YES;
 }
 
-void douitask(id appDelegate, void *p)
+void douitask(id appDelegate, SEL sel, void *p)
 {
 	NSAutoreleasePool *pool;
 	NSValue *fp;
@@ -136,7 +145,7 @@ void douitask(id appDelegate, void *p)
 	// we need to make an NSAutoreleasePool, otherwise we get leak warnings on stderr
 	pool = [NSAutoreleasePool new];
 	fp = [NSValue valueWithPointer:p];
-	[appDelegate performSelectorOnMainThread:@selector(uitask:)
+	[appDelegate performSelectorOnMainThread:sel
 		withObject:fp
 		waitUntilDone:YES];			// wait so we can properly drain the autorelease pool; on other platforms we wind up waiting anyway (since the main thread can only handle one thing at a time) so
 	[pool release];

objc_darwin.h

@@ -63,7 +63,8 @@ extern uintptr_t keyCode(id);
 extern id makeAppDelegate(void);
 extern id windowGetContentView(id);
 extern BOOL initCocoa(id);
-extern void douitask(id, void *);
+extern SEL createWindow;
+extern void douitask(id, SEL, void *);
 extern void breakMainLoop(void);
 extern void cocoaMainLoop(void);
 

uitask_darwin.go

@@ -13,7 +13,28 @@ import (
 // #include "objc_darwin.h"
 import "C"
 
-var uitask chan func()
+// the performSelectorOnMainThread: in our uitask functions is told to wait until the action is done before it returns
+// so we're fine keeping this on the Go side since the GC won't collect it from under us
+type uitaskParams struct {
+	window	*Window		// createWindow
+	control	Control		// createWindow
+	show	bool			// createWindow
+}
+
+//export uitask_createWindow
+func uitask_createWindow(data unsafe.Pointer) {
+	uc := (*uitaskParams)(data)
+	uc.window.create(uc.control, uc.show)
+}
+
+func (_uitask) createWindow(w *Window, c Control, s bool) {
+	uc := &uitaskParams{
+		window:	w,
+		control:	c,
+		show:	s,
+	}
+	C.douitask(appDelegate, C.createWindow, unsafe.Pointer(uc))
+}
 
 func uiinit() error {
 	err := initCocoa()
@@ -21,22 +42,15 @@ func uiinit() error {
 		return err
 	}
 
-	// do this at the end in case something goes wrong
-	uitask = make(chan func())
 	return nil
 }
 
 func ui() {
 	// Cocoa must run on the first thread created by the program, so we run our dispatcher on another thread instead
 	go func() {
-		for {
-			select {
-			case f := <-uitask:
-				C.douitask(appDelegate, unsafe.Pointer(&f))
-			case <-Stop:
+		<-Stop
+		// TODO is this function thread-safe?
 		C.breakMainLoop()
-			}
-		}
 	}()
 
 	C.cocoaMainLoop()