+@interface NSObject (Cydia)
+- (void) yieldToSelector:(SEL)selector withObject:(id)object;
+@end
+
+@implementation NSObject (Cydia)
+
+- (void) doNothing {
+}
+
+- (void) _yieldToContext:(NSArray *)context { _pooled
+ SEL selector(reinterpret_cast<SEL>([[context objectAtIndex:0] pointerValue]));
+ id object([[context objectAtIndex:1] nonretainedObjectValue]);
+ volatile bool &stopped(*reinterpret_cast<bool *>([[context objectAtIndex:2] pointerValue]));
+
+ [self performSelector:selector withObject:object];
+
+ stopped = true;
+
+ [self
+ performSelectorOnMainThread:@selector(doNothing)
+ withObject:nil
+ waitUntilDone:NO
+ ];
+}
+
+- (void) yieldToSelector:(SEL)selector withObject:(id)object {
+ volatile bool stopped(false);
+
+ NSArray *context([NSArray arrayWithObjects:
+ [NSValue valueWithPointer:selector],
+ [NSValue valueWithNonretainedObject:object],
+ [NSValue valueWithPointer:const_cast<bool *>(&stopped)],
+ nil]);
+
+ NSThread *thread([[[NSThread alloc]
+ initWithTarget:self
+ selector:@selector(_yieldToContext:)
+ object:context
+ ] autorelease]);
+
+ [thread start];
+
+ NSRunLoop *loop([NSRunLoop currentRunLoop]);
+ NSDate *future([NSDate distantFuture]);
+
+ while (!stopped && [loop runMode:NSDefaultRunLoopMode beforeDate:future]);
+}
+
+@end
+