John Firebaugh 2c8343aa82 [core] Block in Mailbox::close() until neither receive nor push are in progress ...

Otherwise, an ActorRef that's in the process of sending a message could attempt to access an invalid Scheduler reference:

      Thread 1                     Thread 2
--------------------------------------------------
 Scheduler::Scheduler
     Actor::Actor
                              weakMailbox.lock()
     Actor::~Actor
 Scheduler::~Scheduler
                               mailbox->push()
                             scheduler.schedule() 💣

2017-05-24 08:19:19 -07:00

..

mbgl

[core] Block in Mailbox::close() until neither receive nor push are in progress

2017-05-24 08:19:19 -07:00