****************************
Exceptions can be raised inside a coroutine using the throw(
Exceptions raised in this manner will originate at the currently
executing yield state-ment in the coroutine.A coroutine can elect to
catch exceptions and handle them as appropriate. It is not safe to use
throw() as an asynchronous signal to a coroutine—it should never be
invoked from a separate execution thread or in a signal handler.
****************************
What does Beazley mean by this: 'will originate at the currently
executing yield state-ment in the coroutine'
If he's throw'ing an exception surely it originates at the throw:
def mycoroutine():
while len(n) > 2:
n = (yield)
throw('RuntimeError' "die!")
----------------------
Also: 'not safe to use throw() as an asynchronous signal to a coroutine—
it should never be invoked from a separate execution thread or in a
signal handler.'
You can use throw within a coroutine to raise an exception.
How would you use it as an async-sig to a coroutine..
eg: you have two threads
1. coroutine does except FooException:
2. throw(FooException, 'message')
so moment 'throw' runs and an exception is raised.. it'll propagate
within thread-2 to its parent etc - how is thread-1 affected?
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