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POGeneric Threadsafe Property
 

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  1. POGeneric Threadsafe Property
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    <p>I have created this "threadsafe" generic property, that i can use between the main thread and a background Thread. I made it because i was tired of creating Lock-Objects for all my properties and variables.</p> <pre><code>TLockedProp&lt;MyType&gt; = class private FMyProp:MyType; PropLock:TObject; procedure SetMyProp(const Value: MyType); function GetMyProp: MyType; published property Value:MyType read GetMyProp write SetMyProp; public Constructor Create; Destructor Destroy;override; end; { TLockedProp&lt;MyType&gt; } constructor TLockedProp&lt;MyType&gt;.Create; begin inherited; PropLock:=TObject.create end; destructor TLockedProp&lt;MyType&gt;.Destroy; begin PropLock.Free; inherited; end; function TLockedProp&lt;MyType&gt;.GetMyProp: MyType; begin TMonitor.Enter(PropLock); result := FMyProp; TMonitor.Exit(PropLock); end; procedure TLockedProp&lt;MyType&gt;.SetMyProp(const Value: MyType); begin TMonitor.Enter(PropLock); FMyProp := Value; TMonitor.Exit(PropLock); end; </code></pre> <p>Are there any problems i am overlooking? This is some code using this property class. Tell me what you think.</p> <pre><code>TBgThread=class(TThread) private FPaused: TLockedProp&lt;boolean&gt;; FCount:TLockedProp&lt;integer&gt;; procedure ChangeCount(pPlusMin:integer); function GetPaused:boolean; function GetCount:integer; public constructor Create; destructor Destroy;override; {Toggle Pause} procedure PausePlay; protected procedure Execute;override; published Property Paused:boolean read GetPaused; Property Count:integer read GetCount; end; constructor TBgThread.Create(); begin inherited Create(true);; FPaused:=TLockedProp&lt;boolean&gt;.create; FPaused.Value:=false; FCount:=TLockedProp&lt;integer&gt;.create; FCount.Value:=0; end; destructor TBgThread.Destroy; begin FPaused.Free; FCount.free; inherited; end; procedure TBgThread.Execute; begin inherited; Repeat if not Paused then begin Try //do something finally ChangeCount(+1); end; end else Sleep(90); Until Terminated; end; function TBgThread.GetCount: integer; begin Result:=FCount.Value; end; procedure TBgThread.ChangeCount(pPlusMin: integer); begin FCount.Value:=FCount.Value+pPlusMin; end; function TBgThread.GetPaused: boolean; begin result := FPaused.Value; end; procedure TBgThread.PausePlay; begin FPaused.Value:=not FPaused.Value; end; </code></pre>
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