1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/* Cydia - iPhone UIKit Front-End for Debian APT
* Copyright (C) 2008-2012 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
|
