[fpc-pascal] Is TFPList thread safe?

[Jonas Maebe]

On 02 Oct 2014, at 15:59, Xiangrong Fang wrote:

> I think the only thread-critical operation I need is to add item to  
> the
> list, so I will use critical section myself, not replace TFPList with
> TThreadList, for simplicity and performance reason...

It will make your program unstable (adding an element to an fplist can  
cause the entire internal array to move, so if you are in the middle  
of a read operation at the same time, that read operation will either  
read invalid data or crash). Unless you are an expert at multithreaded  
programming, don't try to optimise existing thread-safe structures  
(and definitely don't perform premature optimisations).


Jonas
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