Concurrency

• FIXME

In Development

• switch.py: show task switching
• parent.py: show greenlet ID and parentage
• classes.py: use objects instead of bare functions
  • but set_other method is clumsy: how should we connect them?
• scheduler.py: a queue of runnable tasks is the parent of all tasks
• catch.py: show that uncaught exceptions are caught by parent greenlet
  • error handling is the hardest part of concurrency
• inject.py: pass values into greenlets when resuming them
  • call to .run gets the first value passed in
  • .switch returns a value
  • exercise: use .throw to raise an exception in a greenlet from the outside
• resource.py: busy-wait competition for shared resource
  • wasteful
• wait.py: resource keeps track of who is waiting and who is ready to run
  • all scheduling done by the scheduler
  • if first attempt to acquire fails, acquire again when rescheduled