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- // 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.
- #ifndef MOJO_CORE_BROKER_H_
- #define MOJO_CORE_BROKER_H_
- #include "base/memory/ref_counted.h"
- #include "base/memory/writable_shared_memory_region.h"
- #include "base/synchronization/lock.h"
- #include "mojo/public/cpp/platform/platform_channel_endpoint.h"
- #include "mojo/public/cpp/platform/platform_handle.h"
- namespace mojo {
- namespace core {
- // The Broker is a channel to the broker process, which allows synchronous IPCs
- // to fulfill shared memory allocation requests on some platforms.
- class Broker {
- public:
- // Note: If |wait_for_channel_handle| is |true|, this constructor blocks the
- // calling thread until it reads first message from |handle|, which must
- // contain another PlatformHandle for a NodeChannel.
- //
- // Otherwise, no initialization message is expected and this will not wait for
- // one.
- Broker(PlatformHandle handle, bool wait_for_channel_handle);
- Broker(const Broker&) = delete;
- Broker& operator=(const Broker&) = delete;
- ~Broker();
- // Returns the platform handle that should be used to establish a NodeChannel
- // to the process which is inviting us to join its network. This is the first
- // handle read off the Broker channel upon construction.
- PlatformChannelEndpoint GetInviterEndpoint();
- // Request a shared buffer from the broker process. Blocks the current thread.
- base::WritableSharedMemoryRegion GetWritableSharedMemoryRegion(
- size_t num_bytes);
- private:
- // Handle to the broker process, used for synchronous IPCs.
- PlatformHandle sync_channel_;
- // Channel endpoint connected to the inviter process. Received in the
- // first message over |sync_channel_|.
- PlatformChannelEndpoint inviter_endpoint_;
- // 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 core
- } // namespace mojo
- #endif // MOJO_CORE_BROKER_H_
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