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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "build/build_config.h" | 5 #include "build/build_config.h" |
6 | 6 |
7 #if defined(OS_WIN) | 7 #if defined(OS_WIN) |
8 #include <windows.h> | 8 #include <windows.h> |
9 #endif | 9 #endif |
10 #include <stack> | 10 #include <stack> |
11 | 11 |
12 #include "base/atomic_sequence_num.h" | 12 #include "base/atomic_sequence_num.h" |
13 #include "base/lazy_instance.h" | |
13 #include "base/logging.h" | 14 #include "base/logging.h" |
14 #include "base/synchronization/waitable_event.h" | 15 #include "base/synchronization/waitable_event.h" |
15 #include "ipc/ipc_sync_message.h" | 16 #include "ipc/ipc_sync_message.h" |
16 | 17 |
18 namespace { | |
19 | |
20 struct WaitableEventLazyInstanceTraits | |
21 : public base::DefaultLazyInstanceTraits<base::WaitableEvent> { | |
22 static base::WaitableEvent* New(void* instance) { | |
23 // Use placement new to initialize our instance in our preallocated space. | |
24 return new (instance) base::WaitableEvent(true, true); | |
25 } | |
26 }; | |
27 | |
28 static base::LazyInstance<base::WaitableEvent, WaitableEventLazyInstanceTraits> | |
Nico
2012/02/03 23:02:16
Can you make this ::Lazy? As is, this adds an exit
| |
29 dummy_event = LAZY_INSTANCE_INITIALIZER; | |
30 | |
31 } | |
32 | |
17 namespace IPC { | 33 namespace IPC { |
18 | 34 |
19 #define kSyncMessageHeaderSize 4 | 35 #define kSyncMessageHeaderSize 4 |
20 | 36 |
21 static base::AtomicSequenceNumber g_next_id(base::LINKER_INITIALIZED); | 37 static base::AtomicSequenceNumber g_next_id(base::LINKER_INITIALIZED); |
22 | 38 |
23 static base::WaitableEvent* dummy_event = new base::WaitableEvent(true, true); | |
24 | |
25 SyncMessage::SyncMessage( | 39 SyncMessage::SyncMessage( |
26 int32 routing_id, | 40 int32 routing_id, |
27 uint32 type, | 41 uint32 type, |
28 PriorityValue priority, | 42 PriorityValue priority, |
29 MessageReplyDeserializer* deserializer) | 43 MessageReplyDeserializer* deserializer) |
30 : Message(routing_id, type, priority), | 44 : Message(routing_id, type, priority), |
31 deserializer_(deserializer), | 45 deserializer_(deserializer), |
32 pump_messages_event_(NULL) | 46 pump_messages_event_(NULL) |
33 { | 47 { |
34 set_sync(); | 48 set_sync(); |
35 set_unblock(true); | 49 set_unblock(true); |
36 | 50 |
37 // Add synchronous message data before the message payload. | 51 // Add synchronous message data before the message payload. |
38 SyncHeader header; | 52 SyncHeader header; |
39 header.message_id = g_next_id.GetNext(); | 53 header.message_id = g_next_id.GetNext(); |
40 WriteSyncHeader(this, header); | 54 WriteSyncHeader(this, header); |
41 } | 55 } |
42 | 56 |
43 SyncMessage::~SyncMessage() { | 57 SyncMessage::~SyncMessage() { |
44 } | 58 } |
45 | 59 |
46 MessageReplyDeserializer* SyncMessage::GetReplyDeserializer() { | 60 MessageReplyDeserializer* SyncMessage::GetReplyDeserializer() { |
47 DCHECK(deserializer_.get()); | 61 DCHECK(deserializer_.get()); |
48 return deserializer_.release(); | 62 return deserializer_.release(); |
49 } | 63 } |
50 | 64 |
51 void SyncMessage::EnableMessagePumping() { | 65 void SyncMessage::EnableMessagePumping() { |
52 DCHECK(!pump_messages_event_); | 66 DCHECK(!pump_messages_event_); |
53 set_pump_messages_event(dummy_event); | 67 set_pump_messages_event(dummy_event.Pointer()); |
54 } | 68 } |
55 | 69 |
56 bool SyncMessage::IsMessageReplyTo(const Message& msg, int request_id) { | 70 bool SyncMessage::IsMessageReplyTo(const Message& msg, int request_id) { |
57 if (!msg.is_reply()) | 71 if (!msg.is_reply()) |
58 return false; | 72 return false; |
59 | 73 |
60 return GetMessageId(msg) == request_id; | 74 return GetMessageId(msg) == request_id; |
61 } | 75 } |
62 | 76 |
63 void* SyncMessage::GetDataIterator(const Message* msg) { | 77 void* SyncMessage::GetDataIterator(const Message* msg) { |
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120 | 134 |
121 return true; | 135 return true; |
122 } | 136 } |
123 | 137 |
124 | 138 |
125 bool MessageReplyDeserializer::SerializeOutputParameters(const Message& msg) { | 139 bool MessageReplyDeserializer::SerializeOutputParameters(const Message& msg) { |
126 return SerializeOutputParameters(msg, SyncMessage::GetDataIterator(&msg)); | 140 return SerializeOutputParameters(msg, SyncMessage::GetDataIterator(&msg)); |
127 } | 141 } |
128 | 142 |
129 } // namespace IPC | 143 } // namespace IPC |
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