Don't block on writing to the notifierfd.
Don't block on writing to the notifierfd.

If a threads notification pipe is full, we don't need to notify the
thread anyway since it will check all expired alarms with a single
notification.

FROGGS/parrot,youprofit/parrot,youprofit/parrot,FROGGS/parrot,youprofit/parrot,FROGGS/parrot,youprofit/parrot,youprofit/parrot,tkob/parrot,tkob/parrot,tkob/parrot,youprofit/parrot,youprofit/parrot,FROGGS/parrot,parrot/parrot,tkob/parrot,FROGGS/parrot,parrot/parrot,tkob/parrot,parrot/parrot,parrot/parrot,youprofit/parrot,tkob/parrot,tkob/parrot,FROGGS/parrot,FROGGS/parrot,tkob/parrot,FROGGS/parrot,parrot/parrot