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97 lines
3.9 KiB
C++
97 lines
3.9 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MOJO_EDK_SYSTEM_LOCAL_DATA_PIPE_IMPL_H_
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#define MOJO_EDK_SYSTEM_LOCAL_DATA_PIPE_IMPL_H_
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#include "base/memory/aligned_memory.h"
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#include "base/memory/scoped_ptr.h"
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#include "mojo/edk/system/data_pipe_impl.h"
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#include "mojo/edk/system/system_impl_export.h"
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#include "mojo/public/cpp/system/macros.h"
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namespace mojo {
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namespace system {
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class MessageInTransitQueue;
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// |LocalDataPipeImpl| is a subclass that "implements" |DataPipe| for data pipes
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// whose producer and consumer are both local. See |DataPipeImpl| for more
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// details.
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class MOJO_SYSTEM_IMPL_EXPORT LocalDataPipeImpl final : public DataPipeImpl {
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public:
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LocalDataPipeImpl();
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~LocalDataPipeImpl() override;
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private:
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// |DataPipeImpl| implementation:
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void ProducerClose() override;
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MojoResult ProducerWriteData(UserPointer<const void> elements,
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UserPointer<uint32_t> num_bytes,
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uint32_t max_num_bytes_to_write,
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uint32_t min_num_bytes_to_write) override;
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MojoResult ProducerBeginWriteData(UserPointer<void*> buffer,
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UserPointer<uint32_t> buffer_num_bytes,
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uint32_t min_num_bytes_to_write) override;
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MojoResult ProducerEndWriteData(uint32_t num_bytes_written) override;
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HandleSignalsState ProducerGetHandleSignalsState() const override;
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void ProducerStartSerialize(Channel* channel,
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size_t* max_size,
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size_t* max_platform_handles) override;
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bool ProducerEndSerialize(
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Channel* channel,
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void* destination,
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size_t* actual_size,
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embedder::PlatformHandleVector* platform_handles) override;
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void ConsumerClose() override;
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MojoResult ConsumerReadData(UserPointer<void> elements,
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UserPointer<uint32_t> num_bytes,
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uint32_t max_num_bytes_to_read,
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uint32_t min_num_bytes_to_read,
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bool peek) override;
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MojoResult ConsumerDiscardData(UserPointer<uint32_t> num_bytes,
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uint32_t max_num_bytes_to_discard,
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uint32_t min_num_bytes_to_discard) override;
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MojoResult ConsumerQueryData(UserPointer<uint32_t> num_bytes) override;
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MojoResult ConsumerBeginReadData(UserPointer<const void*> buffer,
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UserPointer<uint32_t> buffer_num_bytes,
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uint32_t min_num_bytes_to_read) override;
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MojoResult ConsumerEndReadData(uint32_t num_bytes_read) override;
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HandleSignalsState ConsumerGetHandleSignalsState() const override;
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void ConsumerStartSerialize(Channel* channel,
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size_t* max_size,
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size_t* max_platform_handles) override;
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bool ConsumerEndSerialize(
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Channel* channel,
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void* destination,
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size_t* actual_size,
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embedder::PlatformHandleVector* platform_handles) override;
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bool OnReadMessage(unsigned port, MessageInTransit* message) override;
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void OnDetachFromChannel(unsigned port) override;
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void EnsureBuffer();
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void DestroyBuffer();
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// Get the maximum (single) write/read size right now (in number of elements);
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// result fits in a |uint32_t|.
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size_t GetMaxNumBytesToWrite();
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size_t GetMaxNumBytesToRead();
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// Marks the given number of bytes as consumed/discarded. |num_bytes| must be
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// no greater than |current_num_bytes_|.
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void MarkDataAsConsumed(size_t num_bytes);
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scoped_ptr<char, base::AlignedFreeDeleter> buffer_;
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// Circular buffer.
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size_t start_index_;
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size_t current_num_bytes_;
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MOJO_DISALLOW_COPY_AND_ASSIGN(LocalDataPipeImpl);
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};
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} // namespace system
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} // namespace mojo
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#endif // MOJO_EDK_SYSTEM_LOCAL_DATA_PIPE_IMPL_H_
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