47 lines
985 B
C++
47 lines
985 B
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#ifndef MPD_EVENT_MASK_MONITOR_HXX
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#define MPD_EVENT_MASK_MONITOR_HXX
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#include "InjectEvent.hxx"
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#include "util/BindMethod.hxx"
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#include <atomic>
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/**
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* Manage a bit mask of events that have occurred. Every time the
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* mask becomes non-zero, OnMask() is called in #EventLoop's thread.
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*
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* This class is thread-safe.
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*/
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class MaskMonitor final {
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InjectEvent event;
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using Callback = BoundMethod<void(unsigned) noexcept>;
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const Callback callback;
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std::atomic_uint pending_mask;
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public:
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MaskMonitor(EventLoop &_loop, Callback _callback) noexcept
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:event(_loop, BIND_THIS_METHOD(RunDeferred)),
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callback(_callback), pending_mask(0) {}
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auto &GetEventLoop() const noexcept {
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return event.GetEventLoop();
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}
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void Cancel() noexcept {
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event.Cancel();
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}
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void OrMask(unsigned new_mask) noexcept;
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protected:
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/* InjectEvent callback */
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void RunDeferred() noexcept;
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};
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#endif
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