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A more powerful signaling construct is provided by the Monitor class, via the static methods Wait and Pulse and PulseAll. The principle is that you write the signaling logic yourself using custom flags and fields enclosed in lock statementsand then introduce Wait and Pulse commands to prevent spinning.
Furthermore, Wait and Pulse can be amenable in situations where all of the wait handles are parsimoniously challenged.
Wait and Pulse signaling, however, has some disadvantages over event wait handles: You must remember to protect all variables related to the signaling logic with locks.
Wait and Advanced topics also have a peculiar aversion to dabblers: Fortunately, there is a simple pattern of use that tames Wait and Pulse.
In terms of performance, calling Pulse takes around a hundred nanoseconds on a era desktop — about a third of the time it takes to call Set on a wait handle.
The overhead for waiting on uncontended signal is entirely up to you — because you implement the logic yourself using ordinary fields and variables. In practice, this is very simple and amounts purely to the cost of taking a lock.
Define a single field for use as the synchronization object, such as: This pattern allows any thread to wait at any time for any condition. Wait method does the following, in order: If the lock is contended, then it blocks until the lock is available. This means that despite appearances, no lock is held on the synchronization object while Monitor.
Wait awaits a pulse: Wait is designed for use within a lock statement; it throws an exception if called otherwise.
The same goes for Monitor. As soon as we release the lock, the worker resumes execution, reiterating its while loop. The Pulse and PulseAll methods release threads blocked on a Wait statement.
Pulse releases a maximum of one thread; PulseAll releases them all.
In our example, just one thread is blocked, so their effects are identical. If more than one thread is waiting, calling PulseAll is usually safest with our suggested pattern of use. In our pattern, pulsing indicates that something might have changed, and that waiting threads should recheck their blocking conditions.
In the Work method, this check is accomplished via the while loop. The waiter then decides whether to continue, not the notifier.C# Advanced Topics: Prepare for Technical Interviews (7, ratings) Course Ratings are calculated from individual students’ ratings and a variety of other signals, like age of rating and reliability, to ensure that they reflect course quality fairly and accurately.
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