thread safe?

[kattunga]

Hi,

I'm interested in use python4delphi in a multi threaded environment, more specifically in an Indy TCP Server.
I need to execute python scripts inside threads in a high concurrent environment.

Looking at source code, I found that gPythonEngine is a global variable so obviously I can't have more that one PythonEngine at the same time in my application.

Is TPythonEngine thread safe?
If yes, how should be the right way to implement python4delphi in a threaded application?

Regards

[pyscripter]

Look at demo 33 regarding using threads with P4D

[kattunga]

In that example you are executing custom TPythonThreads.
In and Indy TCP server I am inside a standard Delphi Thread.
When I try to change the demo 33 to execute Pyhton script inside a standard Thread I get and access violation.

[pyscripter]

TPythonThread is a standard Delphi thread. It inherits from TThread and therefore is a native Windows thread. What it adds to TThread is the management of acquiring and releasing the GIL (Python Global interpreter lock) necessary for avoiding the exceptions you experienced.

…

On 6 February 2018 at 23:26, Christian Pradelli ***@***.***> wrote: In that example you are executing custom TPythonThreads. In and Indy TCP server I am inside a standard Delphi Thread. When I try to change the demo 33 to execute Pyhton script inside a standard Thread I get and access violation. — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub <#47 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABQDgHw0qo9z9Cq05aZvIqFVczkUAMMlks5tSMOUgaJpZM4R7UdP> .

[kattunga]

Ok, so I understand, i should need to write the management of acquiring and releasing the GIL inside the indy thread.
I'll investigate TPythonThread code and I'll to try to wrap that logic inside a function so I can execute code in a thread safe way.

[pyscripter]

Great!