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-rw-r--r--UICaboodle/UCYield.h64
1 files changed, 64 insertions, 0 deletions
diff --git a/UICaboodle/UCYield.h b/UICaboodle/UCYield.h
new file mode 100644
index 0000000..dc75f8f
--- /dev/null
+++ b/UICaboodle/UCYield.h
@@ -0,0 +1,64 @@
+@interface NSObject (UICaboodle)
+- (id) yieldToSelector:(SEL)selector withObject:(id)object;
+- (id) yieldToSelector:(SEL)selector;
+@end
+
+@implementation NSObject (UICaboodle)
+
+- (void) doNothing {
+}
+
+- (void) _yieldToContext:(NSMutableArray *)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]));
+
+ /* XXX: deal with exceptions */
+ id value([self performSelector:selector withObject:object]);
+
+ NSMethodSignature *signature([self methodSignatureForSelector:selector]);
+ [context removeAllObjects];
+ if ([signature methodReturnLength] != 0 && value != nil)
+ [context addObject:value];
+
+ stopped = true;
+
+ [self
+ performSelectorOnMainThread:@selector(doNothing)
+ withObject:nil
+ waitUntilDone:NO
+ ];
+}
+
+- (id) yieldToSelector:(SEL)selector withObject:(id)object {
+ /*return [self performSelector:selector withObject:object];*/
+
+ volatile bool stopped(false);
+
+ NSMutableArray *context([NSMutableArray 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]);
+
+ return [context count] == 0 ? nil : [context objectAtIndex:0];
+}
+
+- (id) yieldToSelector:(SEL)selector {
+ return [self yieldToSelector:selector withObject:nil];
+}
+
+@end