gproc.signal enhance

[Agzer0]

Package that You wish to enhance
signal funcs forgproc

Enhancement description

1. The Listen() method should be executed only once. In business encapsulation, signal listening might be called in different packages, and there could be multiple calls to Listen() (typically done in a goroutine), resulting in the handlers being registered and executed multiple times.

2. After the execution of Listen(), calling AddSigHandler() to add new custom signal handlers may fail to properly listen to the signals.

3. If Listen() is called in one goroutine, and then AddSigHandler()/AddSigHandlerShutdown() is called in another goroutine, it may lead to data race issues, primarily due to the signalHandlerMap, an internal variable of type map.

Additional