is it safe to use methods and properties inside a thread

[inageib]

Hi,
I want to ask is it safe to call methods and read or change properties values of components like TIBCQuery, TIBCSQL, TIBCStoredProc, etc... from inside a thread other than the main app thread ?

Thanks

[AndreyZ]

Hello,

You can safely read properties, but writing properties and calling methods may cause numerous errors which are hard to trace. For example, if you use some code in the main thread that depends on some property value, and at the same time you change this property value in another thread, the code in the main thread may have an unexpected behaviour. The same applies to calling methods. Therefore, you should not access the same component from different threads. If you want to do this, you should ensure thread safety on your own.

[inageib]

I am asking specially if I called execute from within a thread

Code: Select all

<TIBCSQL>.Execute

But also in the main thread I use execute with same component but both not called at same time, as the user need to open a form and press a button in this time the first thread would be finished executing. in addition I can check it the thread is terminated or not. do you think in this case a conflict may still occur ?

[AndreyZ]

In the situation you described it is safe to call the TIBCSQL.Execute method from the thread.

[inageib]

Thanks Andrey

[AndreyZ]

I am glad to help.