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// Copyright 2014 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_SHARED_BUFFER_DISPATCHER_H_
#define MOJO_EDK_SYSTEM_SHARED_BUFFER_DISPATCHER_H_
#include "base/macros.h"
#include "mojo/edk/embedder/platform_shared_buffer.h"
#include "mojo/edk/system/memory.h"
#include "mojo/edk/system/simple_dispatcher.h"
#include "mojo/edk/system/system_impl_export.h"
namespace mojo {
namespace embedder {
class PlatformSupport;
}
namespace system {
// TODO(vtl): We derive from SimpleDispatcher, even though we don't currently
// have anything that's waitable. I want to add a "transferrable" wait flag
// (which would entail overriding |GetHandleSignalsStateImplNoLock()|, etc.).
class MOJO_SYSTEM_IMPL_EXPORT SharedBufferDispatcher : public SimpleDispatcher {
public:
// The default options to use for |MojoCreateSharedBuffer()|. (Real uses
// should obtain this via |ValidateCreateOptions()| with a null |in_options|;
// this is exposed directly for testing convenience.)
static const MojoCreateSharedBufferOptions kDefaultCreateOptions;
// Validates and/or sets default options for |MojoCreateSharedBufferOptions|.
// 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)
// |MojoCreateSharedBufferOptions| and will be entirely overwritten on success
// (it may be partly overwritten on failure).
static MojoResult ValidateCreateOptions(
UserPointer<const MojoCreateSharedBufferOptions> in_options,
MojoCreateSharedBufferOptions* out_options);
// Static factory method: |validated_options| must be validated (obviously).
// On failure, |*result| will be left as-is.
static MojoResult Create(
embedder::PlatformSupport* platform_support,
const MojoCreateSharedBufferOptions& validated_options,
uint64_t num_bytes,
scoped_refptr<SharedBufferDispatcher>* result);
// |Dispatcher| public methods:
Type GetType() const override;
// The "opposite" of |SerializeAndClose()|. (Typically this is called by
// |Dispatcher::Deserialize()|.)
static scoped_refptr<SharedBufferDispatcher> Deserialize(
Channel* channel,
const void* source,
size_t size,
embedder::PlatformHandleVector* platform_handles);
private:
explicit SharedBufferDispatcher(
scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer_);
~SharedBufferDispatcher() override;
// Validates and/or sets default options for
// |MojoDuplicateBufferHandleOptions|. 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) |MojoDuplicateBufferHandleOptions| and will be
// entirely overwritten on success (it may be partly overwritten on failure).
static MojoResult ValidateDuplicateOptions(
UserPointer<const MojoDuplicateBufferHandleOptions> in_options,
MojoDuplicateBufferHandleOptions* out_options);
// |Dispatcher| protected methods:
void CloseImplNoLock() override;
scoped_refptr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock()
override;
MojoResult DuplicateBufferHandleImplNoLock(
UserPointer<const MojoDuplicateBufferHandleOptions> options,
scoped_refptr<Dispatcher>* new_dispatcher) override;
MojoResult MapBufferImplNoLock(
uint64_t offset,
uint64_t num_bytes,
MojoMapBufferFlags flags,
scoped_ptr<embedder::PlatformSharedBufferMapping>* mapping) override;
void StartSerializeImplNoLock(Channel* channel,
size_t* max_size,
size_t* max_platform_handles) override;
bool EndSerializeAndCloseImplNoLock(
Channel* channel,
void* destination,
size_t* actual_size,
embedder::PlatformHandleVector* platform_handles) override;
scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer_;
DISALLOW_COPY_AND_ASSIGN(SharedBufferDispatcher);
};
} // namespace system
} // namespace mojo
#endif // MOJO_EDK_SYSTEM_SHARED_BUFFER_DISPATCHER_H_
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