82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
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////////////////////////////////////////////////////////////////////////////
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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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#ifndef REALM_EXTERNAL_COMMIT_HELPER_HPP
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#define REALM_EXTERNAL_COMMIT_HELPER_HPP
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#include <CoreFoundation/CFRunLoop.h>
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namespace realm {
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class Realm;
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class ExternalCommitHelper {
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public:
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ExternalCommitHelper(Realm* realm);
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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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// This is owned by the realm, so it needs to not retain the realm
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Realm *const m_realm;
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// Runloop which notifications are delivered on
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CFRunLoopRef m_run_loop;
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// The listener thread
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pthread_t m_thread;
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// Read-write file descriptor for the named pipe which is waited on for
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// changes and written to when a commit is made
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FdHolder m_notify_fd;
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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 realm
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#endif /* REALM_EXTERNAL_COMMIT_HELPER_HPP */
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