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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_CORE_H_
#define MOJO_EDK_SYSTEM_CORE_H_
#include <memory>
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/shared_memory_handle.h"
#include "base/synchronization/lock.h"
#include "base/task_runner.h"
#include "mojo/edk/embedder/scoped_platform_handle.h"
#include "mojo/edk/system/dispatcher.h"
#include "mojo/edk/system/handle_signals_state.h"
#include "mojo/edk/system/handle_table.h"
#include "mojo/edk/system/mapping_table.h"
#include "mojo/edk/system/node_controller.h"
#include "mojo/edk/system/system_impl_export.h"
#include "mojo/public/c/system/buffer.h"
#include "mojo/public/c/system/data_pipe.h"
#include "mojo/public/c/system/message_pipe.h"
#include "mojo/public/c/system/platform_handle.h"
#include "mojo/public/c/system/types.h"
#include "mojo/public/cpp/system/message_pipe.h"
namespace base {
class PortProvider;
}
namespace mojo {
namespace edk {
// |Core| is an object that implements the Mojo system calls. All public methods
// are thread-safe.
class MOJO_SYSTEM_IMPL_EXPORT Core {
public:
Core();
virtual ~Core();
// Called exactly once, shortly after construction, and before any other
// methods are called on this object.
void SetIOTaskRunner(scoped_refptr<base::TaskRunner> io_task_runner);
// Retrieves the NodeController for the current process.
NodeController* GetNodeController();
scoped_refptr<Dispatcher> GetDispatcher(MojoHandle handle);
void SetDefaultProcessErrorCallback(const ProcessErrorCallback& callback);
// Called in the parent process any time a new child is launched.
void AddChild(base::ProcessHandle process_handle,
ScopedPlatformHandle platform_handle,
const std::string& child_token,
const ProcessErrorCallback& process_error_callback);
// Called in the parent process when a child process fails to launch.
void ChildLaunchFailed(const std::string& child_token);
// Called to connect to a peer process. This should be called only if there
// is no common ancestor for the processes involved within this mojo system.
// Both processes must call this function, each passing one end of a platform
// channel. This returns one end of a message pipe to each process.
ScopedMessagePipeHandle ConnectToPeerProcess(ScopedPlatformHandle pipe_handle,
const std::string& peer_token);
void ClosePeerConnection(const std::string& peer_token);
// Called in a child process exactly once during early initialization.
void InitChild(ScopedPlatformHandle platform_handle);
// Creates a message pipe endpoint associated with |token|, which a child
// holding the token can later locate and connect to.
ScopedMessagePipeHandle CreateParentMessagePipe(
const std::string& token, const std::string& child_token);
// Creates a message pipe endpoint and connects it to a pipe the parent has
// associated with |token|.
ScopedMessagePipeHandle CreateChildMessagePipe(const std::string& token);
// Sets the mach port provider for this process.
void SetMachPortProvider(base::PortProvider* port_provider);
MojoHandle AddDispatcher(scoped_refptr<Dispatcher> dispatcher);
// Adds new dispatchers for non-message-pipe handles received in a message.
// |dispatchers| and |handles| should be the same size.
bool AddDispatchersFromTransit(
const std::vector<Dispatcher::DispatcherInTransit>& dispatchers,
MojoHandle* handles);
// See "mojo/edk/embedder/embedder.h" for more information on these functions.
MojoResult CreatePlatformHandleWrapper(ScopedPlatformHandle platform_handle,
MojoHandle* wrapper_handle);
MojoResult PassWrappedPlatformHandle(MojoHandle wrapper_handle,
ScopedPlatformHandle* platform_handle);
MojoResult CreateSharedBufferWrapper(
base::SharedMemoryHandle shared_memory_handle,
size_t num_bytes,
bool read_only,
MojoHandle* mojo_wrapper_handle);
MojoResult PassSharedMemoryHandle(
MojoHandle mojo_handle,
base::SharedMemoryHandle* shared_memory_handle,
size_t* num_bytes,
bool* read_only);
// Requests that the EDK tear itself down. |callback| will be called once
// the shutdown process is complete. Note that |callback| is always called
// asynchronously on the calling thread if said thread is running a message
// loop, and the calling thread must continue running a MessageLoop at least
// until the callback is called. If there is no running loop, the |callback|
// may be called from any thread. Beware!
void RequestShutdown(const base::Closure& callback);
MojoResult SetProperty(MojoPropertyType type, const void* value);
// ---------------------------------------------------------------------------
// The following methods are essentially implementations of the Mojo Core
// functions of the Mojo API, with the C interface translated to C++ by
// "mojo/edk/embedder/entrypoints.cc". The best way to understand the contract
// of these methods is to look at the header files defining the corresponding
// API functions, referenced below.
// These methods correspond to the API functions defined in
// "mojo/public/c/system/functions.h":
MojoTimeTicks GetTimeTicksNow();
MojoResult Close(MojoHandle handle);
MojoResult Wait(MojoHandle handle,
MojoHandleSignals signals,
MojoDeadline deadline,
MojoHandleSignalsState* signals_state);
MojoResult WaitMany(const MojoHandle* handles,
const MojoHandleSignals* signals,
uint32_t num_handles,
MojoDeadline deadline,
uint32_t* result_index,
MojoHandleSignalsState* signals_states);
MojoResult Watch(MojoHandle handle,
MojoHandleSignals signals,
MojoWatchCallback callback,
uintptr_t context);
MojoResult CancelWatch(MojoHandle handle, uintptr_t context);
MojoResult AllocMessage(uint32_t num_bytes,
const MojoHandle* handles,
uint32_t num_handles,
MojoAllocMessageFlags flags,
MojoMessageHandle* message);
MojoResult FreeMessage(MojoMessageHandle message);
MojoResult GetMessageBuffer(MojoMessageHandle message, void** buffer);
MojoResult GetProperty(MojoPropertyType type, void* value);
// These methods correspond to the API functions defined in
// "mojo/public/c/system/wait_set.h":
MojoResult CreateWaitSet(MojoHandle* wait_set_handle);
MojoResult AddHandle(MojoHandle wait_set_handle,
MojoHandle handle,
MojoHandleSignals signals);
MojoResult RemoveHandle(MojoHandle wait_set_handle,
MojoHandle handle);
MojoResult GetReadyHandles(MojoHandle wait_set_handle,
uint32_t* count,
MojoHandle* handles,
MojoResult* results,
MojoHandleSignalsState* signals_states);
// These methods correspond to the API functions defined in
// "mojo/public/c/system/message_pipe.h":
MojoResult CreateMessagePipe(
const MojoCreateMessagePipeOptions* options,
MojoHandle* message_pipe_handle0,
MojoHandle* message_pipe_handle1);
MojoResult WriteMessage(MojoHandle message_pipe_handle,
const void* bytes,
uint32_t num_bytes,
const MojoHandle* handles,
uint32_t num_handles,
MojoWriteMessageFlags flags);
MojoResult WriteMessageNew(MojoHandle message_pipe_handle,
MojoMessageHandle message,
MojoWriteMessageFlags flags);
MojoResult ReadMessage(MojoHandle message_pipe_handle,
void* bytes,
uint32_t* num_bytes,
MojoHandle* handles,
uint32_t* num_handles,
MojoReadMessageFlags flags);
MojoResult ReadMessageNew(MojoHandle message_pipe_handle,
MojoMessageHandle* message,
uint32_t* num_bytes,
MojoHandle* handles,
uint32_t* num_handles,
MojoReadMessageFlags flags);
MojoResult FuseMessagePipes(MojoHandle handle0, MojoHandle handle1);
MojoResult NotifyBadMessage(MojoMessageHandle message,
const char* error,
size_t error_num_bytes);
// These methods correspond to the API functions defined in
// "mojo/public/c/system/data_pipe.h":
MojoResult CreateDataPipe(
const MojoCreateDataPipeOptions* options,
MojoHandle* data_pipe_producer_handle,
MojoHandle* data_pipe_consumer_handle);
MojoResult WriteData(MojoHandle data_pipe_producer_handle,
const void* elements,
uint32_t* num_bytes,
MojoWriteDataFlags flags);
MojoResult BeginWriteData(MojoHandle data_pipe_producer_handle,
void** buffer,
uint32_t* buffer_num_bytes,
MojoWriteDataFlags flags);
MojoResult EndWriteData(MojoHandle data_pipe_producer_handle,
uint32_t num_bytes_written);
MojoResult ReadData(MojoHandle data_pipe_consumer_handle,
void* elements,
uint32_t* num_bytes,
MojoReadDataFlags flags);
MojoResult BeginReadData(MojoHandle data_pipe_consumer_handle,
const void** buffer,
uint32_t* buffer_num_bytes,
MojoReadDataFlags flags);
MojoResult EndReadData(MojoHandle data_pipe_consumer_handle,
uint32_t num_bytes_read);
// These methods correspond to the API functions defined in
// "mojo/public/c/system/buffer.h":
MojoResult CreateSharedBuffer(
const MojoCreateSharedBufferOptions* options,
uint64_t num_bytes,
MojoHandle* shared_buffer_handle);
MojoResult DuplicateBufferHandle(
MojoHandle buffer_handle,
const MojoDuplicateBufferHandleOptions* options,
MojoHandle* new_buffer_handle);
MojoResult MapBuffer(MojoHandle buffer_handle,
uint64_t offset,
uint64_t num_bytes,
void** buffer,
MojoMapBufferFlags flags);
MojoResult UnmapBuffer(void* buffer);
// These methods correspond to the API functions defined in
// "mojo/public/c/system/platform_handle.h".
MojoResult WrapPlatformHandle(const MojoPlatformHandle* platform_handle,
MojoHandle* mojo_handle);
MojoResult UnwrapPlatformHandle(MojoHandle mojo_handle,
MojoPlatformHandle* platform_handle);
MojoResult WrapPlatformSharedBufferHandle(
const MojoPlatformHandle* platform_handle,
size_t size,
MojoPlatformSharedBufferHandleFlags flags,
MojoHandle* mojo_handle);
MojoResult UnwrapPlatformSharedBufferHandle(
MojoHandle mojo_handle,
MojoPlatformHandle* platform_handle,
size_t* size,
MojoPlatformSharedBufferHandleFlags* flags);
void GetActiveHandlesForTest(std::vector<MojoHandle>* handles);
private:
MojoResult WaitManyInternal(const MojoHandle* handles,
const MojoHandleSignals* signals,
uint32_t num_handles,
MojoDeadline deadline,
uint32_t* result_index,
HandleSignalsState* signals_states);
// Used to pass ownership of our NodeController over to the IO thread in the
// event that we're torn down before said thread.
static void PassNodeControllerToIOThread(
std::unique_ptr<NodeController> node_controller);
// Guards node_controller_.
//
// TODO(rockot): Consider removing this. It's only needed because we
// initialize node_controller_ lazily and that may happen on any thread.
// Otherwise it's effectively const and shouldn't need to be guarded.
//
// We can get rid of lazy initialization if we defer Mojo initialization far
// enough that zygotes don't do it. The zygote can't create a NodeController.
base::Lock node_controller_lock_;
// This is lazily initialized on first access. Always use GetNodeController()
// to access it.
std::unique_ptr<NodeController> node_controller_;
// The default callback to invoke, if any, when a process error is reported
// but cannot be associated with a specific process.
ProcessErrorCallback default_process_error_callback_;
base::Lock handles_lock_;
HandleTable handles_;
base::Lock mapping_table_lock_; // Protects |mapping_table_|.
MappingTable mapping_table_;
base::Lock property_lock_;
// Properties that can be read using the MojoGetProperty() API.
bool property_sync_call_allowed_ = true;
DISALLOW_COPY_AND_ASSIGN(Core);
};
} // namespace edk
} // namespace mojo
#endif // MOJO_EDK_SYSTEM_CORE_H_