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| unit QueueProcThreads;
interface
uses
Winapi.Windows, System.SysUtils, System.Classes, System.SyncObjs;
type
TQueueProc = reference to procedure(aData :pointer);
TQueueInfo = record
Proc :TQueueProc;
Data :pointer;
end;
TQueueProcThread = class(TThread)
private
Count :integer;
Lock :TCriticalSection;
Queue :array of TQueueInfo;
protected
procedure Execute; override;
procedure TerminatedSet; override;
public
procedure Add(aProc :TQueueProc; aData :pointer = nil);
constructor Create;
destructor Destroy; override;
end;
implementation
{ TQueueProcThread }
procedure TQueueProcThread.Add(aProc :TQueueProc; aData :pointer = nil);
var
Info :TQueueInfo;
begin
Info.Proc := aProc;
Info.Data := aData;
Lock.Acquire;
try
Queue := Queue +[Info];
Count := Length(Queue);
finally
Lock.Release;
end;
WakeByAddressSingle(@Count);
end;
constructor TQueueProcThread.Create;
begin
inherited;
Lock := TCriticalSection.Create;
end;
destructor TQueueProcThread.Destroy;
begin
Lock.Free;
inherited;
end;
procedure TQueueProcThread.Execute;
var
Info :TQueueInfo;
begin
const RefCount = 0;
while not Terminated do
begin
WaitOnAddress(@Count, @RefCount, SizeOf(integer), INFINITE);
if Count > 0 then
begin
Lock.Acquire;
try
Info := Queue[0];
Delete(Queue, 0, 1);
Dec(Count);
finally
Lock.Release;
end;
Info.Proc(Info.Data);
end;
end;
end;
procedure TQueueProcThread.TerminatedSet;
begin
inherited;
Count := -1;
WakeByAddressSingle(@Count);
end;
end. |
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