Michael Schnell wrote:
On 10/02/2014 03:59 PM, Xiangrong Fang wrote:
, not replace TFPList with TThreadList, for simplicity and
performance reason...
I don't suppose it will be possible to beat TThreadList performance by
any home-brew Pascal code, which is same is not insecure.
But I looked at the source code of TThreadList,
procedure TThreadList.Add(Item: Pointer);
begin
LockList;
try
if (Duplicates=dupAccept) or
// make sure it's not already in the list
(FList.IndexOf(Item)=-1) then
FList.Add(Item)
else if (Duplicates=dupError) then
FList.Error(SDuplicateItem,PtrUInt(Item));
finally
UnlockList;
end;
end;
where
function TThreadList.LockList: TList;
begin
Result:=FList;
System.EnterCriticalSection(FLock);
end;
There is no special optimization at all. It simply calls
System.EnterCriticalSection(FLock),
so performance should be JUST THE SAME as wrapping a pair of critical
section enter/leave around the code ourselves.
Dennis
_______________________________________________
fpc-pascal maillist - fpc-pascal@lists.freepascal.org
http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
