cocoa: fix race condition with input context creation

This seems to be a problem only in OS X 10.9. I guess they improved the
general speed of the Cocoa startup and suddenly mpv core takes more time
than the Cocoa thread to initialize.

Fixes #285

(hopefully!)

osdep/macosx_application.m

@@ -77,6 +77,7 @@ static NSString *escape_loadfile_name(NSString *input)
 @synthesize inputContext = _input_context;
 @synthesize eventsResponder = _events_responder;
 @synthesize menuItems = _menu_items;
+@synthesize input_ready = _input_ready;
 
 - (void)sendEvent:(NSEvent *)event
 {
@@ -94,6 +95,7 @@ static NSString *escape_loadfile_name(NSString *input)
         self.argumentsList = [[[NSMutableArray alloc] init] autorelease];
         self.eventsResponder = [[[EventsResponder alloc] init] autorelease];
         self.willStopOnOpenEvent = NO;
+        self.input_ready = [[[NSCondition alloc] init] autorelease];
 
         [NSEvent addLocalMonitorForEventsMatchingMask:NSKeyDownMask|NSKeyUpMask
                                               handler:^(NSEvent *event) {
@@ -325,6 +327,11 @@ int cocoa_main(mpv_main_fn mpv_main, int argc, char *argv[])
         init_cocoa_application();
         macosx_finder_args_preinit(&argc, &argv);
         pthread_create(&playback_thread_id, NULL, playback_thread, &ctx);
+
+        [mpv_shared_app().input_ready lock];
+        [mpv_shared_app().input_ready wait];
+        [mpv_shared_app().input_ready unlock];
+
         cocoa_run_runloop();
 
         // This should never be reached: cocoa_run_runloop blocks until the
@@ -380,6 +387,12 @@ void cocoa_stop_runloop(void)
 
 void cocoa_set_input_context(struct input_ctx *input_context)
 {
+    if (input_context) {
+        [mpv_shared_app().input_ready lock];
+        [mpv_shared_app().input_ready signal];
+        [mpv_shared_app().input_ready unlock];
+    }
+
     mpv_shared_app().inputContext = input_context;
 }
 

osdep/macosx_application_objc.h

@@ -43,6 +43,7 @@
 @property(nonatomic, retain) NSArray *files;
 @property(nonatomic, retain) NSMutableArray *argumentsList;
 @property(nonatomic, assign) BOOL willStopOnOpenEvent;
+@property(nonatomic, retain) NSCondition *input_ready;
 @end
 
 Application *mpv_shared_app(void);