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56 lines
1.8 KiB
56 lines
1.8 KiB
4 months ago
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// Copyright 2016 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_CORE_BROKER_H_
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#define MOJO_CORE_BROKER_H_
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#include "base/macros.h"
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#include "base/memory/ref_counted.h"
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#include "base/memory/writable_shared_memory_region.h"
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#include "base/synchronization/lock.h"
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#include "mojo/public/cpp/platform/platform_channel_endpoint.h"
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#include "mojo/public/cpp/platform/platform_handle.h"
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namespace mojo {
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namespace core {
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// The Broker is a channel to the broker process, which allows synchronous IPCs
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// to fulfill shared memory allocation requests on some platforms.
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class Broker {
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public:
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// Note: This is blocking, and will wait for the first message over
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// the endpoint handle in |handle|.
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explicit Broker(PlatformHandle handle);
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~Broker();
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// Returns the platform handle that should be used to establish a NodeChannel
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// to the process which is inviting us to join its network. This is the first
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// handle read off the Broker channel upon construction.
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PlatformChannelEndpoint GetInviterEndpoint();
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// Request a shared buffer from the broker process. Blocks the current thread.
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base::WritableSharedMemoryRegion GetWritableSharedMemoryRegion(
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size_t num_bytes);
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private:
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// Handle to the broker process, used for synchronous IPCs.
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PlatformHandle sync_channel_;
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// Channel endpoint connected to the inviter process. Recieved in the first
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// first message over |sync_channel_|.
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PlatformChannelEndpoint inviter_endpoint_;
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// Lock to only allow one sync message at a time. This avoids having to deal
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// with message ordering since we can only have one request at a time
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// in-flight.
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base::Lock lock_;
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DISALLOW_COPY_AND_ASSIGN(Broker);
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};
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} // namespace core
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} // namespace mojo
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#endif // MOJO_CORE_BROKER_H_
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