43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
/***
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Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: LSFromFdNonblocking.cpp
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Date: 2022-4-5
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Author: Reece
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***/
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#pragma once
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#if defined(AURORA_IS_LINUX_DERIVED)
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namespace Aurora::IO::UNIX
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{
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bool LinuxOverlappedYield(bool bUserspaceOnly);
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}
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#endif
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namespace Aurora::IO::Loop
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{
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template<typename T>
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inline bool IsSignaledFromNonblockingImpl(ILoopSourceEx *source, T * that, bool(T::*IsSignaledNonblocking)(), bool bIOTick)
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{
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bool val {};
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source->OnPresleep();
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val = ((that)->*(IsSignaledNonblocking))();
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source->OnFinishSleep();
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// Required for precise Windows on Linux OVERLAPPED semantics for emulators.
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// IAsyncTransaction::Complete()/Wait() will always enter an alertable state and dispatch io completion callbacks.
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// In theory, we don't need this.
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// In practice, if NT can atomically set an event and update the apc queue, we could be out of parity.
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if (bIOTick)
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{
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#if defined(AURORA_IS_LINUX_DERIVED)
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// Do not syscall after read or select again under Linux
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UNIX::LinuxOverlappedYield(true);
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#else
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IOYield();
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#endif
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}
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return val;
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}
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} |