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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_SYSTEM_MESSAGE_IN_TRANSIT_H_
#define MOJO_SYSTEM_MESSAGE_IN_TRANSIT_H_
#include <stdint.h>
#include <stdlib.h> // For |free()|.
#include "base/basictypes.h"
namespace mojo {
namespace system {
// This class is used to represent data in transit. It is thread-unsafe.
// Note: This class is POD.
class MessageInTransit {
public:
// Creates a |MessageInTransit| with the data given by |bytes|/|num_bytes|.
static MessageInTransit* Create(const void* bytes, uint32_t num_bytes);
// Destroys a |MessageInTransit| created using |Create()|.
inline void Destroy() {
// No need to call the destructor, since we're POD.
free(this);
}
// Gets the size of the data (in number of bytes).
uint32_t size() const {
return size_;
}
// Gets the data (of size |size()| bytes).
const void* data() const {
return reinterpret_cast<const char*>(this) + sizeof(*this);
}
// TODO(vtl): Add whatever's necessary to transport handles.
private:
explicit MessageInTransit(uint32_t size)
: size_(size), reserved_(0), user_1_(0), user_2_(0) {}
// "Header" for the data.
uint32_t size_;
uint32_t reserved_;
uint32_t user_1_;
uint32_t user_2_;
DISALLOW_COPY_AND_ASSIGN(MessageInTransit);
};
// The size of |MessageInTransit| must be appropriate to maintain alignment of
// the following data.
COMPILE_ASSERT(sizeof(MessageInTransit) == 16, MessageInTransit_has_wrong_size);
} // namespace system
} // namespace mojo
#endif // MOJO_SYSTEM_MESSAGE_IN_TRANSIT_H_
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