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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/*
* Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
*
* 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. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 APPLE OR ITS CONTRIBUTORS 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.
*/
#import "config.h"
#import "MainThread.h"
#import <CoreFoundation/CoreFoundation.h>
#import <Foundation/NSThread.h>
#import <stdio.h>
#import <wtf/Assertions.h>
#import <wtf/Threading.h>
@interface WTFMainThreadCaller : NSObject {
}
- (void)call;
@end
@implementation WTFMainThreadCaller
- (void)call
{
WTF::dispatchFunctionsFromMainThread();
}
@end // implementation WTFMainThreadCaller
namespace WTF {
static WTFMainThreadCaller* staticMainThreadCaller;
static bool isTimerPosted; // This is only accessed on the 'main' thread.
static bool mainThreadEstablishedAsPthreadMain;
static pthread_t mainThreadPthread;
static NSThread* mainThreadNSThread;
void initializeMainThreadPlatform()
{
#if !defined(BUILDING_ON_TIGER)
ASSERT(!staticMainThreadCaller);
staticMainThreadCaller = [[WTFMainThreadCaller alloc] init];
mainThreadEstablishedAsPthreadMain = false;
mainThreadPthread = pthread_self();
mainThreadNSThread = [[NSThread currentThread] retain];
#else
ASSERT_NOT_REACHED();
#endif
}
void initializeMainThreadToProcessMainThreadPlatform()
{
if (!pthread_main_np())
NSLog(@"WebKit Threading Violation - initial use of WebKit from a secondary thread.");
ASSERT(!staticMainThreadCaller);
staticMainThreadCaller = [[WTFMainThreadCaller alloc] init];
mainThreadEstablishedAsPthreadMain = true;
mainThreadPthread = 0;
mainThreadNSThread = nil;
}
static void timerFired(CFRunLoopTimerRef timer, void*)
{
CFRelease(timer);
isTimerPosted = false;
WTF::dispatchFunctionsFromMainThread();
}
static void postTimer()
{
ASSERT(isMainThread());
if (isTimerPosted)
return;
isTimerPosted = true;
CFRunLoopAddTimer(CFRunLoopGetCurrent(), CFRunLoopTimerCreate(0, 0, 0, 0, 0, timerFired, 0), kCFRunLoopCommonModes);
}
void scheduleDispatchFunctionsOnMainThread()
{
ASSERT(staticMainThreadCaller);
if (isMainThread()) {
postTimer();
return;
}
if (mainThreadEstablishedAsPthreadMain) {
ASSERT(!mainThreadNSThread);
[staticMainThreadCaller performSelectorOnMainThread:@selector(call) withObject:nil waitUntilDone:NO];
return;
}
#if !defined(BUILDING_ON_TIGER)
ASSERT(mainThreadNSThread);
[staticMainThreadCaller performSelector:@selector(call) onThread:mainThreadNSThread withObject:nil waitUntilDone:NO];
#else
ASSERT_NOT_REACHED();
#endif
}
bool isMainThread()
{
if (mainThreadEstablishedAsPthreadMain) {
ASSERT(!mainThreadPthread);
return pthread_main_np();
}
#if !defined(BUILDING_ON_TIGER)
ASSERT(mainThreadPthread);
return pthread_equal(pthread_self(), mainThreadPthread);
#else
ASSERT_NOT_REACHED();
return false;
#endif
}
} // namespace WTF
|
