81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
////////////////////////////////////////////////////////////////////////////
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//
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// Copyright 2015 Realm Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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////////////////////////////////////////////////////////////////////////////
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#include <future>
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namespace realm {
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class Realm;
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namespace _impl {
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class RealmCoordinator;
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class ExternalCommitHelper {
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public:
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ExternalCommitHelper(RealmCoordinator& parent);
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~ExternalCommitHelper();
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void notify_others();
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private:
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// A RAII holder for a file descriptor which automatically closes the wrapped
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// fd when it's deallocated
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class FdHolder {
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public:
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FdHolder() = default;
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~FdHolder() { close(); }
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operator int() const { return m_fd; }
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FdHolder& operator=(int newFd) {
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close();
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m_fd = newFd;
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return *this;
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}
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private:
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int m_fd = -1;
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void close();
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FdHolder& operator=(FdHolder const&) = delete;
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FdHolder(FdHolder const&) = delete;
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};
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void listen();
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RealmCoordinator& m_parent;
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// The listener thread
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std::future<void> m_thread;
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// Pipe which is waited on for changes and written to when there is a new
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// commit to notify others of. When using a named pipe m_notify_fd is
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// read-write and m_notify_fd_write is unused; when using an anonymous pipe
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// (on tvOS) m_notify_fd is read-only and m_notify_fd_write is write-only.
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FdHolder m_notify_fd;
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FdHolder m_notify_fd_write;
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// File descriptor for the kqueue
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FdHolder m_kq;
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// The two ends of an anonymous pipe used to notify the kqueue() thread that
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// it should be shut down.
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FdHolder m_shutdown_read_fd;
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FdHolder m_shutdown_write_fd;
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};
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} // namespace _impl
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} // namespace realm
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