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+/* Cydia - iPhone UIKit Front-End for Debian APT
+ * Copyright (C) 2008-2011 Jay Freeman (saurik)
+*/
+
+/* Modified BSD License {{{ */
+/*
+ * Redistribution and use in source and binary
+ * forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the
+ * above copyright notice, this list of conditions
+ * and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the
+ * above copyright notice, this list of conditions
+ * and the following disclaimer in the documentation
+ * and/or other materials provided with the
+ * distribution.
+ * 3. The name of the author may not be used to endorse
+ * or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/* }}} */
+
+#include "Menes/yieldToSelector.h"
+
+@implementation NSObject (MenesYieldToSelector)
+
+- (void) doNothing {
+}
+
+- (void) _yieldToContext:(NSMutableArray *)context {
+ NSAutoreleasePool *pool([[NSAutoreleasePool alloc] init]);
+
+ 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
+ ];
+
+ [pool release];
+}
+
+- (id) yieldToSelector:(SEL)selector withObject:(id)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]);
+ NSString *mode([loop currentMode] ?: NSDefaultRunLoopMode);
+
+ while (!stopped && [loop runMode:mode beforeDate:future]);
+
+ return [context count] == 0 ? nil : [context objectAtIndex:0];
+}
+
+- (id) yieldToSelector:(SEL)selector {
+ return [self yieldToSelector:selector withObject:nil];
+}
+
+@end