StackOverflow2013

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18779515
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2013-09-13T06:21:13.227
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2013-10-28T18:42:12.340
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2017-05-23T10:29:57.447
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133516
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10378253
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2
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6
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text
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<p><a href="https://stackoverflow.com/a/909591/133516"><code>TOmniMREW</code></a> from <code>OmniThreadLibrary</code> claims to be faster and more lightweight: </p> <p>OTL is an excellent threading lib, BTW.</p> <h1>Sample Code</h1> <pre><code>TOmniReaderWriterLock = class(TInterfacedObject, IReaderWriterLock) private omrewReference: Integer; public { IReaderWriterLock } procedure BeginRead; procedure EndRead; procedure BeginWrite; procedure EndWrite; end; { TOmniReaderWriterLock } procedure TOmniReaderWriterLock.BeginRead; var currentReference: Integer; begin //Wait on writer to reset write flag so Reference.Bit0 must be 0 than increase Reference repeat currentReference := Integer(omrewReference) and not 1; until currentReference = Integer(InterlockedCompareExchange(Pointer(omrewReference), Pointer(Integer(currentReference) + 2), Pointer(currentReference))); end; procedure TOmniReaderWriterLock.EndRead; begin //Decrease omrewReference InterlockedExchangeAdd(@omrewReference, -2); end; procedure TOmniReaderWriterLock.BeginWrite; var currentReference: integer; begin //Wait on writer to reset write flag so omrewReference.Bit0 must be 0 then set omrewReference.Bit0 repeat currentReference := omrewReference and (not 1); until currentReference = Integer(InterlockedCompareExchange(Pointer(omrewReference), Pointer(currentReference+1), Pointer(currentReference))); //Now wait on all readers repeat until omrewReference = 1; end; procedure TOmniReaderWriterLock.EndWrite; begin omrewReference := 0; end; </code></pre>
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