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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/*
* Copyright (C) 2010 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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.
*/
#include "WorkQueue.h"
#include <mach/mach_port.h>
#include <wtf/PassOwnPtr.h>
#if HAVE(DISPATCH_H)
void WorkQueue::executeWorkItem(void* item)
{
WorkQueue* queue = static_cast<WorkQueue*>(dispatch_get_context(dispatch_get_current_queue()));
OwnPtr<WorkItem> workItem(static_cast<WorkItem*>(item));
{
MutexLocker locker(queue->m_isValidMutex);
if (!queue->m_isValid)
return;
}
workItem->execute();
}
void WorkQueue::scheduleWork(PassOwnPtr<WorkItem> item)
{
dispatch_async_f(m_dispatchQueue, item.leakPtr(), executeWorkItem);
}
void WorkQueue::scheduleWorkAfterDelay(PassOwnPtr<WorkItem> item, double delay)
{
dispatch_time_t delayTime = dispatch_time(DISPATCH_TIME_NOW, delay * NSEC_PER_SEC);
dispatch_after_f(delayTime, m_dispatchQueue, item.leakPtr(), executeWorkItem);
}
class WorkQueue::EventSource {
public:
EventSource(MachPortEventType eventType, dispatch_source_t dispatchSource, PassOwnPtr<WorkItem> workItem)
: m_eventType(eventType)
, m_dispatchSource(dispatchSource)
, m_workItem(workItem)
{
}
dispatch_source_t dispatchSource() const { return m_dispatchSource; }
static void eventHandler(void* source)
{
EventSource* eventSource = static_cast<EventSource*>(source);
eventSource->m_workItem->execute();
}
static void cancelHandler(void* source)
{
EventSource* eventSource = static_cast<EventSource*>(source);
mach_port_t machPort = dispatch_source_get_handle(eventSource->m_dispatchSource);
switch (eventSource->m_eventType) {
case MachPortDataAvailable:
// Release our receive right.
mach_port_mod_refs(mach_task_self(), machPort, MACH_PORT_RIGHT_RECEIVE, -1);
break;
case MachPortDeadNameNotification:
// Release our send right.
mach_port_deallocate(mach_task_self(), machPort);
break;
}
}
static void finalizeHandler(void* source)
{
EventSource* eventSource = static_cast<EventSource*>(source);
delete eventSource;
}
private:
MachPortEventType m_eventType;
// This is a weak reference, since m_dispatchSource references the event source.
dispatch_source_t m_dispatchSource;
OwnPtr<WorkItem> m_workItem;
};
void WorkQueue::registerMachPortEventHandler(mach_port_t machPort, MachPortEventType eventType, PassOwnPtr<WorkItem> workItem)
{
dispatch_source_type_t sourceType = 0;
switch (eventType) {
case MachPortDataAvailable:
sourceType = DISPATCH_SOURCE_TYPE_MACH_RECV;
break;
case MachPortDeadNameNotification:
sourceType = DISPATCH_SOURCE_TYPE_MACH_SEND;
break;
}
dispatch_source_t dispatchSource = dispatch_source_create(sourceType, machPort, 0, m_dispatchQueue);
EventSource* eventSource = new EventSource(eventType, dispatchSource, workItem);
dispatch_set_context(dispatchSource, eventSource);
dispatch_source_set_event_handler_f(dispatchSource, &EventSource::eventHandler);
dispatch_source_set_cancel_handler_f(dispatchSource, &EventSource::cancelHandler);
dispatch_set_finalizer_f(dispatchSource, &EventSource::finalizeHandler);
// Add the source to our set of sources.
{
MutexLocker locker(m_eventSourcesMutex);
ASSERT(!m_eventSources.contains(machPort));
m_eventSources.set(machPort, eventSource);
// And start it!
dispatch_resume(dispatchSource);
}
}
void WorkQueue::unregisterMachPortEventHandler(mach_port_t machPort)
{
ASSERT(machPort);
MutexLocker locker(m_eventSourcesMutex);
HashMap<mach_port_t, EventSource*>::iterator it = m_eventSources.find(machPort);
ASSERT(it != m_eventSources.end());
ASSERT(m_eventSources.contains(machPort));
EventSource* eventSource = it->second;
// Cancel and release the source. It will be deleted in its finalize handler.
dispatch_source_cancel(eventSource->dispatchSource());
dispatch_release(eventSource->dispatchSource());
m_eventSources.remove(it);
}
void WorkQueue::platformInitialize(const char* name)
{
m_dispatchQueue = dispatch_queue_create(name, 0);
dispatch_set_context(m_dispatchQueue, this);
}
void WorkQueue::platformInvalidate()
{
#if !ASSERT_DISABLED
MutexLocker locker(m_eventSourcesMutex);
ASSERT(m_eventSources.isEmpty());
#endif
dispatch_release(m_dispatchQueue);
}
#else /* !HAVE(DISPATCH_H) */
void WorkQueue::scheduleWork(PassOwnPtr<WorkItem> item)
{
}
void WorkQueue::registerMachPortEventHandler(mach_port_t, MachPortEventType, PassOwnPtr<WorkItem>)
{
}
void WorkQueue::unregisterMachPortEventHandler(mach_port_t)
{
}
void WorkQueue::platformInitialize(const char*)
{
}
void WorkQueue::platformInvalidate()
{
}
#endif
|
