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Sample text
For general purposes, it is safer to always test conditions in a loop. 2. The mutex is unlocked prior to signalling another thread. When a thread is unblocked, the first thing it tries to do is lock the mutex. It will immediately block again if the mutex is still locked. Suppose that a thread signals another thread before unlocking the mutex. That thread will awake and block, wasting processor time. Now, if we set aside for a moment the ideal view that there is true parallelism and consider the possibilities in a time-sliced system, the situation is worse.
If signal() were to be used instead of broadcast() (and the calling thread can be relied on), there is still the threat in some systems of spurious wakeups. For general purposes, it is safer to always test conditions in a loop. 2. The mutex is unlocked prior to signalling another thread. When a thread is unblocked, the first thing it tries to do is lock the mutex. It will immediately block again if the mutex is still locked. Suppose that a thread signals another thread before unlocking the mutex.
When a thread is created, it has a default priority, Introduction to Threading Issues 15 and it is probably better to leave it as it is, so that all threads execute at the same priority. ThreadGroup. Thread groups allow certain operations to be applied to every thread in the group, which is sometimes convenient, especially if you need to suspend and resume all your threads at the same time. Thread groups may contain other thread groups, allowing a tree of threads to be built up. Thread groups make it easy to keep tabs on the status of your threads, and are mostly used for administrative purposes.