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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 "ipc/ipc_sync_message.h" | 5 #include "ipc/ipc_sync_message.h" |
6 | 6 |
7 #include <stdint.h> | 7 #include <stdint.h> |
8 | 8 |
9 #include <stack> | 9 #include <stack> |
10 | 10 |
11 #include "base/atomic_sequence_num.h" | 11 #include "base/atomic_sequence_num.h" |
12 #include "base/lazy_instance.h" | |
13 #include "base/logging.h" | 12 #include "base/logging.h" |
14 #include "base/synchronization/waitable_event.h" | |
15 #include "build/build_config.h" | 13 #include "build/build_config.h" |
16 | 14 |
17 namespace { | 15 namespace { |
18 | 16 |
19 struct WaitableEventLazyInstanceTraits | |
20 : public base::DefaultLazyInstanceTraits<base::WaitableEvent> { | |
21 static base::WaitableEvent* New(void* instance) { | |
22 // Use placement new to initialize our instance in our preallocated space. | |
23 return new (instance) | |
24 base::WaitableEvent(base::WaitableEvent::ResetPolicy::MANUAL, | |
25 base::WaitableEvent::InitialState::SIGNALED); | |
26 } | |
27 }; | |
28 | |
29 base::LazyInstance<base::WaitableEvent, WaitableEventLazyInstanceTraits> | |
30 dummy_event = LAZY_INSTANCE_INITIALIZER; | |
31 | |
32 base::StaticAtomicSequenceNumber g_next_id; | 17 base::StaticAtomicSequenceNumber g_next_id; |
33 | 18 |
34 } // namespace | 19 } // namespace |
35 | 20 |
36 namespace IPC { | 21 namespace IPC { |
37 | 22 |
38 #define kSyncMessageHeaderSize 4 | 23 #define kSyncMessageHeaderSize 4 |
39 | 24 |
40 SyncMessage::SyncMessage(int32_t routing_id, | 25 SyncMessage::SyncMessage(int32_t routing_id, |
41 uint32_t type, | 26 uint32_t type, |
42 PriorityValue priority, | 27 PriorityValue priority, |
43 MessageReplyDeserializer* deserializer) | 28 MessageReplyDeserializer* deserializer) |
44 : Message(routing_id, type, priority), | 29 : Message(routing_id, type, priority), |
45 deserializer_(deserializer), | 30 deserializer_(deserializer) { |
46 pump_messages_event_(NULL) { | |
47 set_sync(); | 31 set_sync(); |
48 set_unblock(true); | 32 set_unblock(true); |
49 | 33 |
50 // Add synchronous message data before the message payload. | 34 // Add synchronous message data before the message payload. |
51 SyncHeader header; | 35 SyncHeader header; |
52 header.message_id = g_next_id.GetNext(); | 36 header.message_id = g_next_id.GetNext(); |
53 WriteSyncHeader(this, header); | 37 WriteSyncHeader(this, header); |
54 } | 38 } |
55 | 39 |
56 SyncMessage::~SyncMessage() { | 40 SyncMessage::~SyncMessage() { |
57 } | 41 } |
58 | 42 |
59 MessageReplyDeserializer* SyncMessage::GetReplyDeserializer() { | 43 MessageReplyDeserializer* SyncMessage::GetReplyDeserializer() { |
60 DCHECK(deserializer_.get()); | 44 DCHECK(deserializer_.get()); |
61 return deserializer_.release(); | 45 return deserializer_.release(); |
62 } | 46 } |
63 | 47 |
64 void SyncMessage::EnableMessagePumping() { | |
65 DCHECK(!pump_messages_event_); | |
66 set_pump_messages_event(dummy_event.Pointer()); | |
67 } | |
68 | |
69 bool SyncMessage::IsMessageReplyTo(const Message& msg, int request_id) { | 48 bool SyncMessage::IsMessageReplyTo(const Message& msg, int request_id) { |
70 if (!msg.is_reply()) | 49 if (!msg.is_reply()) |
71 return false; | 50 return false; |
72 | 51 |
73 return GetMessageId(msg) == request_id; | 52 return GetMessageId(msg) == request_id; |
74 } | 53 } |
75 | 54 |
76 base::PickleIterator SyncMessage::GetDataIterator(const Message* msg) { | 55 base::PickleIterator SyncMessage::GetDataIterator(const Message* msg) { |
77 base::PickleIterator iter(*msg); | 56 base::PickleIterator iter(*msg); |
78 if (!iter.SkipBytes(kSyncMessageHeaderSize)) | 57 if (!iter.SkipBytes(kSyncMessageHeaderSize)) |
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135 | 114 |
136 return true; | 115 return true; |
137 } | 116 } |
138 | 117 |
139 | 118 |
140 bool MessageReplyDeserializer::SerializeOutputParameters(const Message& msg) { | 119 bool MessageReplyDeserializer::SerializeOutputParameters(const Message& msg) { |
141 return SerializeOutputParameters(msg, SyncMessage::GetDataIterator(&msg)); | 120 return SerializeOutputParameters(msg, SyncMessage::GetDataIterator(&msg)); |
142 } | 121 } |
143 | 122 |
144 } // namespace IPC | 123 } // namespace IPC |
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