StackOverflow2013

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PO
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Id
16667625
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2013-05-21T10:19:52.357
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2015-03-06T10:00:40.673
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2015-03-06T10:00:40.673
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1453339
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8
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text
Body
Following explanation actually explains how wait() and signal() of monitor differ from P and V of semaphore. The wait() and signal() operations on condition variables in a monitor are similar to P and V operations on counting semaphores. A wait statement can block a process's execution, while a signal statement can cause another process to be unblocked. However, there are some differences between them. When a process executes a P operation, it does not necessarily block that process because the counting semaphore may be greater than zero. In contrast, when a wait statement is executed, it always blocks the process. When a task executes a V operation on a semaphore, it either unblocks a task waiting on that semaphore or increments the semaphore counter if there is no task to unlock. On the other hand, if a process executes a signal statement when there is no other process to unblock, there is no effect on the condition variable. Another difference between semaphores and monitors is that users awaken by a V operation can resume execution without delay. Contrarily, users awaken by a signal operation are restarted only when the monitor is unlocked. In addition, a monitor solution is more structured than the one with semaphores because the data and procedures are encapsulated in a single module and that the mutual exclusion is provided automatically by the implementation. Link: <a href="http://wiki.answers.com/Q/What_is_basic_difference_between_semaphore_and_monitor_in_operating_system" rel="noreferrer">here</a> for further reading. Hope it helps.
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1. This table or related slice is empty.
PostParentId
1. POSemaphore vs. Monitors - what's the difference?
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USAbu Shumon
UserOwnerUserId
1. USAbu Shumon
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