blob: 1577972a6d43af78de6d1823126aafa33a97f642 [file] [log] [blame]
// Copyright 2016 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.
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "mojo/edk/embedder/scoped_platform_handle.h"
namespace mojo {
namespace edk {
class PlatformSharedBuffer;
// The Broker is a channel to the parent process, which allows synchronous IPCs.
class Broker {
// Note: This is blocking, and will wait for the first message over
// |platform_handle|.
explicit Broker(ScopedPlatformHandle platform_handle);
// Returns the platform handle that should be used to establish a NodeChannel
// to the parent process.
ScopedPlatformHandle GetParentPlatformHandle();
// Request a shared buffer from the parent process. Blocks the current thread.
scoped_refptr<PlatformSharedBuffer> GetSharedBuffer(size_t num_bytes);
// Handle to the parent process, used for synchronous IPCs.
ScopedPlatformHandle sync_channel_;
// Handle to the parent process which is recieved in the first first message
// over |sync_channel_|.
ScopedPlatformHandle parent_channel_;
// Lock to only allow one sync message at a time. This avoids having to deal
// with message ordering since we can only have one request at a time
// in-flight.
base::Lock lock_;
} // namespace edk
} // namespace mojo