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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MOJO_CORE_DATA_PIPE_CONSUMER_DISPATCHER_H_
#define MOJO_CORE_DATA_PIPE_CONSUMER_DISPATCHER_H_
#include <stddef.h>
#include <stdint.h>
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/shared_memory_mapping.h"
#include "base/memory/unsafe_shared_memory_region.h"
#include "base/synchronization/lock.h"
#include "mojo/core/dispatcher.h"
#include "mojo/core/ports/port_ref.h"
#include "mojo/core/system_impl_export.h"
#include "mojo/core/watcher_set.h"
#include "mojo/public/c/system/data_pipe.h"
namespace mojo {
namespace core {
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:
static scoped_refptr<DataPipeConsumerDispatcher> Create(
NodeController* node_controller,
const ports::PortRef& control_port,
base::UnsafeSharedMemoryRegion shared_ring_buffer,
const MojoCreateDataPipeOptions& options,
uint64_t pipe_id);
DataPipeConsumerDispatcher(const DataPipeConsumerDispatcher&) = delete;
DataPipeConsumerDispatcher& operator=(const DataPipeConsumerDispatcher&) =
delete;
// Dispatcher:
Type GetType() const override;
MojoResult Close() override;
MojoResult ReadData(const MojoReadDataOptions& validated_options,
void* elements,
uint32_t* num_bytes) override;
MojoResult BeginReadData(const void** buffer,
uint32_t* buffer_num_bytes) override;
MojoResult EndReadData(uint32_t num_bytes_read) override;
HandleSignalsState GetHandleSignalsState() const override;
MojoResult AddWatcherRef(const scoped_refptr<WatcherDispatcher>& watcher,
uintptr_t context) override;
MojoResult RemoveWatcherRef(WatcherDispatcher* watcher,
uintptr_t context) 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(NodeController* node_controller,
const ports::PortRef& control_port,
base::UnsafeSharedMemoryRegion shared_ring_buffer,
const MojoCreateDataPipeOptions& options,
uint64_t pipe_id);
~DataPipeConsumerDispatcher() override;
bool InitializeNoLock();
MojoResult CloseNoLock();
HandleSignalsState GetHandleSignalsStateNoLock() const;
void NotifyRead(uint32_t num_bytes);
void OnPortStatusChanged();
void UpdateSignalsStateNoLock();
const MojoCreateDataPipeOptions options_;
const raw_ptr<NodeController> node_controller_;
const ports::PortRef control_port_;
const uint64_t pipe_id_;
// Guards access to the fields below.
mutable base::Lock lock_;
WatcherSet watchers_;
base::UnsafeSharedMemoryRegion shared_ring_buffer_;
// We don't really write to it, and it's safe because we're the only consumer
// of this buffer.
base::WritableSharedMemoryMapping ring_buffer_mapping_;
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 peer_remote_ = false;
bool transferred_ = false;
uint32_t read_offset_ = 0;
uint32_t bytes_available_ = 0;
// Indicates whether any new data is available since the last read attempt.
bool new_data_available_ = false;
};
} // namespace core
} // namespace mojo
#endif // MOJO_CORE_DATA_PIPE_CONSUMER_DISPATCHER_H_
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