TMultiReadExclusiveWriteSynchronizer

[Properties (by Name)][Methods (by Name)][Events (by Name)]

Standard implementation of a IReadWriteSync interface

Declaration

Source position: systhrdh.inc line 40

Type
  TMultiReadExclusiveWriteSynchronizer = class (TInterfacedObject, IReadWriteSync)
  private
    fThreadList : Array[0..15] of Pointer;
    freaderqueue : peventstate;
    fwritelock : TRtlCriticalSection;
    fwaitingwriterlock : prtlevent;
    fWriterThreadID : TThreadID;
    fRevisionLevel : Cardinal;
    fwriterequests : Cardinal;
    factivethreads : Cardinal;
  protected
    function ThreadIDtoIndex(aThreadID: TThreadID) : Integer;
    function GetThreadInfo(AutoCreate: Boolean) : Pointer;
    procedure RemoveThread(AThreadInfo: Pointer);
  public
    constructor Create;  Virtual;
    destructor Destroy;  Override;
    function Beginwrite : Boolean;
    procedure Endwrite;
    procedure Beginread;
    procedure Endread;
    RevisionLevel : Cardinal;
    WriterThreadID : TThreadID;
  end
  ;

Description

TMultiReadExclusiveWriteSynchronizer is a default implementation of the IReadWriteSync interface. It uses a single mutex to protect access to the read/write resource, resulting in a single thread having access to the resource.

Members

Member	Type	Visibility	Description
Beginread	Method	public	Request read access to the resource
Beginwrite	Method	public	Request write access to the resource.
Create	Method	public	Create a new instance of the TMultiReadExclusiveWriteSynchronizer class
Destroy	Method	public	Destroys the TMultiReadExclusiveWriteSynchronizer instance
Endread	Method	public	Release read access to the resource
Endwrite	Method	public	Release write access to the resource
factivethreads	Field	private
freaderqueue	Field	private
fRevisionLevel	Field	private
fThreadList	Field	private
fwaitingwriterlock	Field	private
fwritelock	Field	private
fwriterequests	Field	private
fWriterThreadID	Field	private
GetThreadInfo	Method	protected
RemoveThread	Method	protected
RevisionLevel	Property	public
ThreadIDtoIndex	Method	protected
WriterThreadID	Property	public

Inheritance

Class	Description
TMultiReadExclusiveWriteSynchronizer(IReadWriteSync)	Standard implementation of a IReadWriteSync interface

See also

Name	Description
Cardinal	An unsigned 32-bits integer.
Cardinal	An unsigned 32-bits integer.
Cardinal	An unsigned 32-bits integer.
Cardinal	An unsigned 32-bits integer.
IReadWriteSync	Read/Write synchronizer
peventstate	Pointer to EventState, which is an opaque type.
prtlevent	Pointer to RTLEvent, which is an opaque type.
TRtlCriticalSection	A critical section.
TThreadID	Type for Thread-IDs
TThreadID	Type for Thread-IDs