14-May-2013 08:33, Heinz пишет:
BTW, given recent discussion on memory barriers, I think my previous statement that the mutex does not need to be locked to call notify is probably incorrect.
Have to lock it otherwise you have a race condition on a condition variable (wow!).
Haven't had any issues calling notify outside a synchronized statement, even from multiple threads. At least this works under Win32 with my producer thread all wrapped inside synchronized(). Only a single consumer thread is inside synchronized() but then i have 2 more threads making naked calls to notify(). Not a single crash.
Doesn't prove anything, it could happen that you just miss a notification, for instance. Another common case is that it so happens that wait will (with luck) always happen before any of notify and notifications come spaced out in time.
-- Dmitry Olshansky
