gsw_service doesn't clean up SHM writers #55
Description
When gsw_service receives an interrupt, it cancels the parent context, and immediately exits, as the process waits on the main thread. This doesn't give children a chance to execute deferred functions, resulting in SHM not being cleaned up.
This could be fixed by implementing a WaitGroup in gsw_service.go and having the main thread wait on each thread to exit before exiting.