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// Copyright 2013 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_DATA_PIPE_CONSUMER_DISPATCHER_H_
#define MOJO_EDK_SYSTEM_DATA_PIPE_CONSUMER_DISPATCHER_H_
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "mojo/edk/embedder/platform_handle_vector.h"
#include "mojo/edk/embedder/platform_shared_buffer.h"
#include "mojo/edk/embedder/scoped_platform_handle.h"
#include "mojo/edk/system/awakable_list.h"
#include "mojo/edk/system/dispatcher.h"
#include "mojo/edk/system/ports/port_ref.h"
#include "mojo/edk/system/system_impl_export.h"
namespace mojo {
namespace edk {
class NodeController;
// This is the Dispatcher implementation for the consumer handle for data
// pipes created by the Mojo primitive MojoCreateDataPipe(). This class is
// thread-safe.
class MOJO_SYSTEM_IMPL_EXPORT DataPipeConsumerDispatcher final
: public Dispatcher {
public:
DataPipeConsumerDispatcher(
NodeController* node_controller,
const ports::PortRef& control_port,
scoped_refptr<PlatformSharedBuffer> shared_ring_buffer,
const MojoCreateDataPipeOptions& options,
bool initialized,
uint64_t pipe_id);
// Dispatcher:
Type GetType() const override;
MojoResult Close() override;
MojoResult Watch(MojoHandleSignals signals,
const Watcher::WatchCallback& callback,
uintptr_t context) override;
MojoResult CancelWatch(uintptr_t context) override;
MojoResult ReadData(void* elements,
uint32_t* num_bytes,
MojoReadDataFlags flags) override;
MojoResult BeginReadData(const void** buffer,
uint32_t* buffer_num_bytes,
MojoReadDataFlags flags) override;
MojoResult EndReadData(uint32_t num_bytes_read) override;
HandleSignalsState GetHandleSignalsState() const override;
MojoResult AddAwakable(Awakable* awakable,
MojoHandleSignals signals,
uintptr_t context,
HandleSignalsState* signals_state) override;
void RemoveAwakable(Awakable* awakable,
HandleSignalsState* signals_state) override;
void StartSerialize(uint32_t* num_bytes,
uint32_t* num_ports,
uint32_t* num_handles) override;
bool EndSerialize(void* destination,
ports::PortName* ports,
PlatformHandle* handles) override;
bool BeginTransit() override;
void CompleteTransitAndClose() override;
void CancelTransit() override;
static scoped_refptr<DataPipeConsumerDispatcher>
Deserialize(const void* data,
size_t num_bytes,
const ports::PortName* ports,
size_t num_ports,
PlatformHandle* handles,
size_t num_handles);
private:
class PortObserverThunk;
friend class PortObserverThunk;
~DataPipeConsumerDispatcher() override;
void InitializeNoLock();
MojoResult CloseNoLock();
HandleSignalsState GetHandleSignalsStateNoLock() const;
void NotifyRead(uint32_t num_bytes);
void OnPortStatusChanged();
void UpdateSignalsStateNoLock();
const MojoCreateDataPipeOptions options_;
NodeController* const node_controller_;
const ports::PortRef control_port_;
const uint64_t pipe_id_;
// Guards access to the fields below.
mutable base::Lock lock_;
AwakableList awakable_list_;
scoped_refptr<PlatformSharedBuffer> shared_ring_buffer_;
std::unique_ptr<PlatformSharedBufferMapping> ring_buffer_mapping_;
ScopedPlatformHandle buffer_handle_for_transit_;
bool in_two_phase_read_ = false;
uint32_t two_phase_max_bytes_read_ = 0;
bool in_transit_ = false;
bool is_closed_ = false;
bool peer_closed_ = false;
bool transferred_ = false;
uint32_t read_offset_ = 0;
uint32_t bytes_available_ = 0;
DISALLOW_COPY_AND_ASSIGN(DataPipeConsumerDispatcher);
};
} // namespace edk
} // namespace mojo
#endif // MOJO_EDK_SYSTEM_DATA_PIPE_CONSUMER_DISPATCHER_H_
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