Multithreaded usage of casbin

[AlekseiChFirebolt]

Hey Guys. I have an issues to use casbin in multithreaded mode in C++, it might be great if you will help me to way out :) If someone can please share - do you have a plans to support mutlithreading?

Context:

• need to call "IEnforcer::enforce" method multiple times from several threads
• policy and model defined on creation of IEnforcer instance
• Flaky "segmentation fault" take a place in this special call

Problems:

• Enforcer class not implemented for ThreadSafe usage ( Enforce method not a const and have no mutex )
• SyncedEnforcer class not implemented for ThreadSafe usage of ::Enforce method ( using of shared_mutex and read protecting shared_lock will not prevent second thread from using "m_enforce", which will mutate "FunctionMap m_func_map" and other properties of Enforcer internal state in undefined order).

Quesions:

• is anyone can to work on issue like this?
• do you guys have any plans to improve multithreading in c++ libraray?

Best regards, Aleksei

[casbin-bot]

@EmperorYP7 @sheny1xuan @cs1137195420

[hsluoyz]

@PokIsemaine

[PokIsemaine]

Thanks for feedback. You are right. It looks like there is something wrong with the current implementation of SyncedEnforcer::Enforce and our associated tests are flawed. I plan to fix this and add some tests in the next few days.