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mojo/public/cpp/system/message_pipe.h

-// 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.
-
-// This file provides a C++ wrapping around the Mojo C API for message pipes,
-// replacing the prefix of "Mojo" with a "mojo" namespace, and using more
-// strongly-typed representations of |MojoHandle|s.
-//
-// Please see "mojo/public/c/include/mojo/system/message_pipe.h" for complete
-// documentation of the API.
-
-#ifndef MOJO_PUBLIC_CPP_SYSTEM_MESSAGE_PIPE_H_
-#define MOJO_PUBLIC_CPP_SYSTEM_MESSAGE_PIPE_H_
-
-#include <assert.h>
-#include <mojo/system/message_pipe.h>
-
-#include "mojo/public/cpp/system/handle.h"
-#include "mojo/public/cpp/system/macros.h"
-
-namespace mojo {
-
-// A strongly-typed representation of a |MojoHandle| to one end of a message
-// pipe.
-class MessagePipeHandle : public Handle {
- public:
-  MessagePipeHandle() {}
-  explicit MessagePipeHandle(MojoHandle value) : Handle(value) {}
-
-  // Copying and assignment allowed.
-};
-
-static_assert(sizeof(MessagePipeHandle) == sizeof(Handle),
-              "Bad size for C++ MessagePipeHandle");
-
-typedef ScopedHandleBase<MessagePipeHandle> ScopedMessagePipeHandle;
-static_assert(sizeof(ScopedMessagePipeHandle) == sizeof(MessagePipeHandle),
-              "Bad size for C++ ScopedMessagePipeHandle");
-
-// Creates a message pipe. See |MojoCreateMessagePipe()| for complete
-// documentation.
-inline MojoResult CreateMessagePipe(const MojoCreateMessagePipeOptions* options,
-                                    ScopedMessagePipeHandle* message_pipe0,
-                                    ScopedMessagePipeHandle* message_pipe1) {
-  assert(message_pipe0);
-  assert(message_pipe1);
-  MessagePipeHandle handle0;
-  MessagePipeHandle handle1;
-  MojoResult rv = MojoCreateMessagePipe(
-      options, handle0.mutable_value(), handle1.mutable_value());
-  // Reset even on failure (reduces the chances that a "stale"/incorrect handle
-  // will be used).
-  message_pipe0->reset(handle0);
-  message_pipe1->reset(handle1);
-  return rv;
-}
-
-// The following "...Raw" versions fully expose the underlying API, and don't
-// help with ownership of handles (especially when writing messages). It is
-// expected that in most cases these methods will be called through generated
-// bindings anyway.
-// TODO(vtl): Write friendlier versions of these functions (using scoped
-// handles and/or vectors) if there is a demonstrated need for them.
-
-// Writes to a message pipe.  If handles are attached, on success the handles
-// will no longer be valid (the receiver will receive equivalent, but logically
-// different, handles). See |MojoWriteMessage()| for complete documentation.
-inline MojoResult WriteMessageRaw(MessagePipeHandle message_pipe,
-                                  const void* bytes,
-                                  uint32_t num_bytes,
-                                  const MojoHandle* handles,
-                                  uint32_t num_handles,
-                                  MojoWriteMessageFlags flags) {
-  return MojoWriteMessage(
-      message_pipe.value(), bytes, num_bytes, handles, num_handles, flags);
-}
-
-// Reads from a message pipe. See |MojoReadMessage()| for complete
-// documentation.
-inline MojoResult ReadMessageRaw(MessagePipeHandle message_pipe,
-                                 void* bytes,
-                                 uint32_t* num_bytes,
-                                 MojoHandle* handles,
-                                 uint32_t* num_handles,
-                                 MojoReadMessageFlags flags) {
-  return MojoReadMessage(
-      message_pipe.value(), bytes, num_bytes, handles, num_handles, flags);
-}
-
-// A wrapper class that automatically creates a message pipe and owns both
-// handles.
-class MessagePipe {
- public:
-  MessagePipe();
-  explicit MessagePipe(const MojoCreateMessagePipeOptions& options);
-  ~MessagePipe();
-
-  ScopedMessagePipeHandle handle0;
-  ScopedMessagePipeHandle handle1;
-};
-
-inline MessagePipe::MessagePipe() {
-  MojoResult result = CreateMessagePipe(nullptr, &handle0, &handle1);
-  MOJO_ALLOW_UNUSED_LOCAL(result);
-  assert(result == MOJO_RESULT_OK);
-}
-
-inline MessagePipe::MessagePipe(const MojoCreateMessagePipeOptions& options) {
-  MojoResult result = CreateMessagePipe(&options, &handle0, &handle1);
-  MOJO_ALLOW_UNUSED_LOCAL(result);
-  assert(result == MOJO_RESULT_OK);
-}
-
-inline MessagePipe::~MessagePipe() {
-}
-
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_SYSTEM_MESSAGE_PIPE_H_