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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_LOCAL_DATA_PIPE_H_
#define MOJO_EDK_SYSTEM_LOCAL_DATA_PIPE_H_
#include "base/macros.h"
#include "base/memory/aligned_memory.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "mojo/edk/system/data_pipe.h"
#include "mojo/edk/system/system_impl_export.h"
namespace mojo {
namespace system {
// |LocalDataPipe| is a subclass that "implements" |DataPipe| for data pipes
// whose producer and consumer are both local. This class is thread-safe (with
// protection provided by |DataPipe|'s |lock_|.
class MOJO_SYSTEM_IMPL_EXPORT LocalDataPipe : public DataPipe {
public:
// |validated_options| should be the output of |DataPipe::ValidateOptions()|.
// In particular: |struct_size| is ignored (so |validated_options| must be the
// current version of the struct) and |capacity_num_bytes| must be nonzero.
explicit LocalDataPipe(const MojoCreateDataPipeOptions& validated_options);
private:
friend class base::RefCountedThreadSafe<LocalDataPipe>;
~LocalDataPipe() override;
// |DataPipe| implementation:
void ProducerCloseImplNoLock() override;
MojoResult ProducerWriteDataImplNoLock(
UserPointer<const void> elements,
UserPointer<uint32_t> num_bytes,
uint32_t max_num_bytes_to_write,
uint32_t min_num_bytes_to_write) override;
MojoResult ProducerBeginWriteDataImplNoLock(
UserPointer<void*> buffer,
UserPointer<uint32_t> buffer_num_bytes,
uint32_t min_num_bytes_to_write) override;
MojoResult ProducerEndWriteDataImplNoLock(
uint32_t num_bytes_written) override;
HandleSignalsState ProducerGetHandleSignalsStateImplNoLock() const override;
void ConsumerCloseImplNoLock() override;
MojoResult ConsumerReadDataImplNoLock(UserPointer<void> elements,
UserPointer<uint32_t> num_bytes,
uint32_t max_num_bytes_to_read,
uint32_t min_num_bytes_to_read,
bool peek) override;
MojoResult ConsumerDiscardDataImplNoLock(
UserPointer<uint32_t> num_bytes,
uint32_t max_num_bytes_to_discard,
uint32_t min_num_bytes_to_discard) override;
MojoResult ConsumerQueryDataImplNoLock(
UserPointer<uint32_t> num_bytes) override;
MojoResult ConsumerBeginReadDataImplNoLock(
UserPointer<const void*> buffer,
UserPointer<uint32_t> buffer_num_bytes,
uint32_t min_num_bytes_to_read) override;
MojoResult ConsumerEndReadDataImplNoLock(uint32_t num_bytes_read) override;
HandleSignalsState ConsumerGetHandleSignalsStateImplNoLock() const override;
void EnsureBufferNoLock();
void DestroyBufferNoLock();
// Get the maximum (single) write/read size right now (in number of elements);
// result fits in a |uint32_t|.
size_t GetMaxNumBytesToWriteNoLock();
size_t GetMaxNumBytesToReadNoLock();
// Marks the given number of bytes as consumed/discarded. |num_bytes| must be
// greater than |current_num_bytes_|.
void MarkDataAsConsumedNoLock(size_t num_bytes);
// The members below are protected by |DataPipe|'s |lock_|:
scoped_ptr<char, base::AlignedFreeDeleter> buffer_;
// Circular buffer.
size_t start_index_;
size_t current_num_bytes_;
DISALLOW_COPY_AND_ASSIGN(LocalDataPipe);
};
} // namespace system
} // namespace mojo
#endif // MOJO_EDK_SYSTEM_LOCAL_DATA_PIPE_H_
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