39 lines
622 B
C++
39 lines
622 B
C++
// SPDX-License-Identifier: BSD-2-Clause
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// author: Max Kellermann <max.kellermann@gmail.com>
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#ifndef EVENT_FD_HXX
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#define EVENT_FD_HXX
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#include "io/UniqueFileDescriptor.hxx"
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/**
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* A class that wraps eventfd().
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*/
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class EventFD {
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UniqueFileDescriptor fd;
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public:
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/**
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* Throws on error.
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*/
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EventFD();
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FileDescriptor Get() const noexcept {
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return fd;
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}
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/**
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* Checks if Write() was called at least once since the last
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* Read() call.
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*/
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bool Read() noexcept;
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/**
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* Wakes up the reader. Multiple calls to this function will
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* be combined to one wakeup.
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*/
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void Write() noexcept;
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};
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#endif
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