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We have talked about blocking locks, which voluntarily yield, and spinlocks, which just spin until they acquire the lock. At ?rst, it seems like spinlocks are verywasteful, and that one should always use blocking locks. But this question is a bit more complicated than that. In well-written code, locks are only held around small pieces of code, so they should not be held for very long. On a multi-processor system, it often makes sense to use spinlocks, since the thread holding the lock will likely release the lock soon, and may be running simultaneously on another processor, about to release the lock.
This question is further complicated, however, by the possibility of pagefaults (see virtual mem- ory, later in this course). Pagefaults or similar hard-to-predict delays couldmake evenwell-written multi-threaded code hold locks for longer than anticipated. A hybrid type of lock, called spin-then-yield locks, will spin for some amount of time, and if it still hasn't acquired the lock, yield. A spin-then-yield lock can be adaptive in the amount of time it spins before yielding.
Why are segmentation and paging sometimes combined into one scheme? Segmentation and paging are often combined in order to improve upon each other. Segmented paging is helpful
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How can a user program disturb the normal operation of the system? a) Issuing illegal I/O operation. b) By accessing memory locations within the OS itself. c) Refusing to
Define Overflow Chaining Another method will divide the pre-allocated table into two sections: the primary area to determine which keys are mapped and an area for collisions, g
Medium term scheduling is form of the swapping operation. This attaches to processes that are in a suspended or blocked state. They are swapped out of real-memory storage until t
is there any difference between the trap and interrupt??
The hardware to support demand paging is as follows Page table: This table has the skill to mark an entry invalid though a valid-invalid bit or particular value of protectio
what is the operating cycle in vegetable growing?
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