Having introduced the usage of condition variables, let's use it to revisit and solve the classic bounded producer / consumer problem.
12.
Spurious wakeups may sound strange, but on some multiprocessor systems, making condition wakeup completely predictable might substantially slow all condition variable operations.
13.
It is also common to provide a "'notify all "'operation that moves all threads waiting on a condition variable to the e queue.
14.
(When the condition variable can be queried as to the number of threads waiting on its queue, more sophisticated contracts can be given.
15.
In most types of monitors, these other threads may signal the condition variable to indicate that assertion is true in the current state.
16.
The condition variable represents threads that are waiting for the queue to be non-full " and " ones waiting for it to be non-empty.
17.
However, doing this would require using " notifyAll " in all the threads using the condition variable and cannot use a regular " signal ".
18.
Finally, while RPC is primarily a synchronous protocol, it is used asynchronously in DART in conjunction with mutexes, condition variables, and other types of locks.
19.
Conceptually a condition variable is a queue of threads, associated with a monitor, on which a thread may wait for some condition to become true.
20.
A variant of this solution could use a single condition variable for both producers and consumers, perhaps named " queueFullOrEmptyCV " or " queueSizeChangedCV ".
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