Const
ppIdle : Integer = -1;
ppNormal : Integer = 0;
ppHigh : Integer = 1;
ppRealTime : Integer = 2;

Function SetProcessPriority( Priority : Integer ) : Integer;
Var
H : THandle;
Begin
Result := ppNormal;
H := GetCurrentProcess();
If ( Priority = ppIdle ) Then
SetPriorityClass( H, IDLE_PRIORITY_CLASS )
Else If ( Priority = ppNormal ) Then
SetPriorityClass( H, NORMAL_PRIORITY_CLASS )
Else If ( Priority = ppHigh ) Then
SetPriorityClass( H, HIGH_PRIORITY_CLASS )
Else If ( Priority = ppRealTime ) Then
SetPriorityClass( H, REALTIME_PRIORITY_CLASS );
Case GetPriorityClass( H ) Of
IDLE_PRIORITY_CLASS : Result := ppIdle;
NORMAL_PRIORITY_CLASS : Result := ppNormal;
HIGH_PRIORITY_CLASS : Result := ppHigh;
REALTIME_PRIORITY_CLASS : Result := ppRealTime;
End;
End;

Function GetProcessPriority : Integer;
Var
H : THandle;
Begin
Result := ppNormal;
H := GetCurrentProcess();
Case GetPriorityClass( H ) Of
IDLE_PRIORITY_CLASS : Result := ppIdle;
NORMAL_PRIORITY_CLASS : Result := ppNormal;
HIGH_PRIORITY_CLASS : Result := ppHigh;
REALTIME_PRIORITY_CLASS : Result := ppRealTime;
End;
End;

Как использовать:

Function SetProcessPriority( Priority : Integer ) : Integer;

для установки приоритета Вашего приложения, либо:

Function GetProcessPriority : Integer;

для получения приоритета.

Взято из http://forum.sources.ru

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