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https://gitlab.com/freepascal.org/fpc/source.git
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49f01e7b64
critical section, so that it can be entered recursively just like
the one from TSimpleRWSync + test
- reverted r14593, since the reason for using TRWSync instead of
TMultiReadExclusiveWriteSynchronizer was because the former
supported recursive write locks
git-svn-id: trunk@14594 -
51 lines
1.4 KiB
PHP
51 lines
1.4 KiB
PHP
{
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This file is part of the Free Pascal run time library.
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Copyright (c) 1999-2001 by the Free Pascal development team
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************}
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type
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IReadWriteSync = interface
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['{7B108C52-1D8F-4CDB-9CDF-57E071193D3F}']
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procedure BeginRead;
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procedure EndRead;
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function BeginWrite : boolean;
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procedure EndWrite;
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end;
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TSimpleRWSync = class(TInterfacedObject,IReadWriteSync)
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private
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crit : TRtlCriticalSection;
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public
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constructor Create; virtual;
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destructor Destroy; override;
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function Beginwrite : boolean;
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procedure Endwrite;
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procedure Beginread;
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procedure Endread;
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end;
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TMultiReadExclusiveWriteSynchronizer = class(TInterfacedObject,IReadWriteSync)
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private
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freaderqueue: peventstate;
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fwritelock : TRtlCriticalSection;
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fwaitingwriterlock: prtlevent;
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freadercount: cardinal;
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fwritelocked: longint;
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public
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constructor Create; virtual;
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destructor Destroy; override;
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function Beginwrite : boolean;
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procedure Endwrite;
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procedure Beginread;
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procedure Endread;
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end;
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