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author | jabdelmalek@google.com <jabdelmalek@google.com@0039d316-1c4b-4281-b951-d872f2087c98> | 2010-04-06 20:33:36 +0000 |
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committer | jabdelmalek@google.com <jabdelmalek@google.com@0039d316-1c4b-4281-b951-d872f2087c98> | 2010-04-06 20:33:36 +0000 |
commit | 1e9499c21c23b52391d952572bd9059df532efcb (patch) | |
tree | bd96f3ed1bd4226b062085316346c77e6bb999ab /ipc/ipc_sync_message_filter.h | |
parent | ae2e0f96d38961c160bf54962a55eb1f44a0f943 (diff) | |
download | chromium_src-1e9499c21c23b52391d952572bd9059df532efcb.zip chromium_src-1e9499c21c23b52391d952572bd9059df532efcb.tar.gz chromium_src-1e9499c21c23b52391d952572bd9059df532efcb.tar.bz2 |
Allow synchronous messages to be sent from threads other than the main thread. This simplifies code that needs to do this (i.e. webkit db and file threads).
BUG=23423
Review URL: http://codereview.chromium.org/1601005
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@43752 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'ipc/ipc_sync_message_filter.h')
-rw-r--r-- | ipc/ipc_sync_message_filter.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/ipc/ipc_sync_message_filter.h b/ipc/ipc_sync_message_filter.h new file mode 100644 index 0000000..71d24c1 --- /dev/null +++ b/ipc/ipc_sync_message_filter.h @@ -0,0 +1,79 @@ +// Copyright (c) 2010 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#ifndef IPC_IPC_SYNC_MESSAGE_FILTER_H_ +#define IPC_IPC_SYNC_MESSAGE_FILTER_H_ + +#include "base/basictypes.h" +#include "base/hash_tables.h" +#include "base/lock.h" +#include "base/ref_counted.h" +#include "base/waitable_event.h" +#include "ipc/ipc_channel_proxy.h" +#include "ipc/ipc_sync_message.h" + +class MessageLoop; + +#if defined(COMPILER_GCC) +// Allows us to use MessageLoop in a hash_map with gcc (MSVC is okay without +// specifying this). +namespace __gnu_cxx { +template<> +struct hash<MessageLoop*> { + size_t operator()(MessageLoop* message_loop) const { + return reinterpret_cast<size_t>(message_loop); + } +}; +} +#endif + +namespace IPC { + +class MessageReplyDeserializer; + +// This MessageFilter allows sending synchronous IPC messages from a thread +// other than the listener thread associated with the SyncChannel. It does not +// support fancy features that SyncChannel does, such as handling recursion or +// receiving messages while waiting for a response. Note that this object can +// be used to send simultaneous synchronous messages from different threads. +class SyncMessageFilter : public ChannelProxy::MessageFilter, + public Message::Sender { + public: + explicit SyncMessageFilter(base::WaitableEvent* shutdown_event); + virtual ~SyncMessageFilter(); + + // Message::Sender implementation. + virtual bool Send(Message* message); + + // ChannelProxy::MessageFilter implementation. + virtual void OnFilterAdded(Channel* channel); + virtual void OnChannelError(); + virtual void OnChannelClosing(); + virtual bool OnMessageReceived(const Message& message); + + private: + void SendOnIOThread(Message* message); + // Signal all the pending sends as done, used in an error condition. + void SignalAllEvents(); + + // The channel to which this filter was added. + Channel* channel_; + + MessageLoop* listener_loop_; // The process's main thread. + MessageLoop* io_loop_; // The message loop where the Channel lives. + + typedef base::hash_map<MessageLoop*, PendingSyncMsg*> PendingSyncMessages; + PendingSyncMessages pending_sync_messages_; + + // Locks data members above. + Lock lock_; + + base::WaitableEvent* shutdown_event_; + + DISALLOW_COPY_AND_ASSIGN(SyncMessageFilter); +}; + +} // namespace IPC + +#endif // IPC_IPC_SYNC_MESSAGE_FILTER_H_ |