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Unified Diff: mojo/edk/system/message_pipe_dispatcher.h

Issue 1350023003: Add a Mojo EDK for Chrome that uses one OS pipe per message pipe. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: more cleanup Created 5 years, 2 months ago
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Index: mojo/edk/system/message_pipe_dispatcher.h
diff --git a/mojo/edk/system/message_pipe_dispatcher.h b/mojo/edk/system/message_pipe_dispatcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..c47b55050ab670a21ced73d0a19903b563ba8136
--- /dev/null
+++ b/mojo/edk/system/message_pipe_dispatcher.h
@@ -0,0 +1,145 @@
+// Copyright 2015 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 MOJO_EDK_SYSTEM_MESSAGE_PIPE_DISPATCHER_H_
+#define MOJO_EDK_SYSTEM_MESSAGE_PIPE_DISPATCHER_H_
+
+#include "base/memory/ref_counted.h"
+#include "mojo/edk/embedder/platform_channel_pair.h"
+#include "mojo/edk/system/awakable_list.h"
+#include "mojo/edk/system/dispatcher.h"
+#include "mojo/edk/system/raw_channel.h"
+#include "mojo/edk/system/system_impl_export.h"
+#include "mojo/public/cpp/system/macros.h"
+
+namespace mojo {
+namespace edk {
+
+// This is the |Dispatcher| implementation for message pipes (created by the
+// Mojo primitive |MojoCreateMessagePipe()|). This class is thread-safe.
+class MOJO_SYSTEM_IMPL_EXPORT MessagePipeDispatcher final
+ : public Dispatcher, public RawChannel::Delegate {
+ public:
+ // The default options to use for |MojoCreateMessagePipe()|. (Real uses
+ // should obtain this via |ValidateCreateOptions()| with a null |in_options|;
+ // this is exposed directly for testing convenience.)
+ static const MojoCreateMessagePipeOptions kDefaultCreateOptions;
+
+ static scoped_refptr<MessagePipeDispatcher> Create(
+ const MojoCreateMessagePipeOptions& /*validated_options*/) {
+ return make_scoped_refptr(new MessagePipeDispatcher());
+ }
+
+ // Validates and/or sets default options for |MojoCreateMessagePipeOptions|.
+ // If non-null, |in_options| must point to a struct of at least
+ // |in_options->struct_size| bytes. |out_options| must point to a (current)
+ // |MojoCreateMessagePipeOptions| and will be entirely overwritten on success
+ // (it may be partly overwritten on failure).
+ static MojoResult ValidateCreateOptions(
+ const MojoCreateMessagePipeOptions* in_options,
+ MojoCreateMessagePipeOptions* out_options);
+
+ // Must be called before any other methods. (This method is not thread-safe.)
+ void Init(ScopedPlatformHandle message_pipe);
+
+ // |Dispatcher| public methods:
+ Type GetType() const override;
+
+ // The "opposite" of |SerializeAndClose()|. (Typically this is called by
+ // |Dispatcher::Deserialize()|.)
+ static scoped_refptr<MessagePipeDispatcher> Deserialize(
+ const void* source,
+ size_t size,
+ PlatformHandleVector* platform_handles);
+
+ private:
+ MessagePipeDispatcher();
+ ~MessagePipeDispatcher() override;
+
+ void InitWithReadBuffer(ScopedPlatformHandle message_pipe,
+ char* data,
+ size_t size);
+
+ void InitOnIO();
+ void CloseOnIO();
+
+ // |Dispatcher| protected methods:
+ void CancelAllAwakablesNoLock() override;
+ void CloseImplNoLock() override;
+ scoped_refptr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock()
+ override;
+ MojoResult WriteMessageImplNoLock(
+ const void* bytes,
+ uint32_t num_bytes,
+ std::vector<DispatcherTransport>* transports,
+ MojoWriteMessageFlags flags) override;
+ MojoResult ReadMessageImplNoLock(void* bytes,
+ uint32_t* num_bytes,
+ DispatcherVector* dispatchers,
+ uint32_t* num_dispatchers,
+ MojoReadMessageFlags flags) override;
+ HandleSignalsState GetHandleSignalsStateImplNoLock() const override;
+ MojoResult AddAwakableImplNoLock(Awakable* awakable,
+ MojoHandleSignals signals,
+ uint32_t context,
+ HandleSignalsState* signals_state) override;
+ void RemoveAwakableImplNoLock(Awakable* awakable,
+ HandleSignalsState* signals_state) override;
+ void StartSerializeImplNoLock(size_t* max_size,
+ size_t* max_platform_handles) override;
+ bool EndSerializeAndCloseImplNoLock(
+ void* destination,
+ size_t* actual_size,
+ PlatformHandleVector* platform_handles) override;
+ void TransportStarted() override;
+ void TransportEnded() override;
+
+ // |RawChannel::Delegate methods:
+ void OnReadMessage(
+ const MessageInTransit::View& message_view,
+ ScopedPlatformHandleVectorPtr platform_handles) override;
+ void OnError(Error error) override;
+
+ // Calls ReleaseHandle and serializes the raw channel. This is split into a
+ // function because it's called in two different ways:
+ // 1) When serializing "live" dispatchers that are passed to MojoWriteMessage,
+ // CreateEquivalentDispatcherAndCloseImplNoLock calls this.
+ // 2) When serializing dispatchers that are attached to deserialized messages
+ // which haven't been consumed by MojoReadMessage, StartSerializeImplNoLock
+ // calls this.
+ void SerializeInternal();
+
+ MojoResult AttachTransportsNoLock(
+ MessageInTransit* message,
+ std::vector<DispatcherTransport>* transports);
+
+ // Protected by |lock()|:
+ RawChannel* channel_;
+
+ // Queue of incoming messages that we read from RawChannel but haven't been
+ // consumed through MojoReadMessage yet.
+ MessageInTransitQueue message_queue_;
+ // When sending MP, contains serialized message_queue_.
+ bool serialized_;
+ // TODO(jam): stop using this and use shared memory instead since we are
+ // limited to 10K.
+ std::vector<char> serialized_message_queue_;
+ std::vector<char> serialized_read_buffer_;
+ PlatformHandle serialized_platform_handle_;
+ AwakableList awakable_list_;
+
+ // If DispatcherTransport is created. Must be set before lock() is called to
+ // avoid deadlocks with RawChannel calling us.
+ base::Lock started_transport_;
+
+ bool calling_init_;
+ bool error_;
+
+ MOJO_DISALLOW_COPY_AND_ASSIGN(MessagePipeDispatcher);
+};
+
+} // namespace edk
+} // namespace mojo
+
+#endif // MOJO_EDK_SYSTEM_MESSAGE_PIPE_DISPATCHER_H_

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