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For example, by initializing a semaphore to 0, threads can wait for an event to occur, and impose an ordering constraint, similar to a monitor using condition variables, but with memory: semaphore sem=0; // 0==locked for a semaphore
thread Adown(sem) // wait for thread B; note sem has memory!// do stuffthread B// do stuff, then wake up Aup(sem)
What are threads? A thread - sometimes called as an implementation context or a lightweight process - is a single sequential flow of control within a program. We use threads
The permission function is used to calculate what, if any access each class or level of user has to each file on a Unix machine. The permission task is one of the data components s
How are file sharing and protection implemented? To execute file sharing and protection the system have to maintain more file and directory attributes than are needed on a sing
Explain the Resource Ownership and Control Operating systems are required to handle many different types of resources. CPU , memory, and I/O devices are some of the varied sys
Q. Can a system detect that some of its processes are starving? If you answer "yes," explain how it can. If you answer "no," explain how the system can deal with the starvation pro
what are the overall concepts of deadlock
Introduction of linux
Since each thread has its own processing space therefore communication between threads will need to be done through a common global variable. Since multiple threads can access the
What is a Real-time system? A Real-time system is used when inflexible time requirements have placed on the operation of processor or the flow of data so it is often used as a
What is spooling? Spooling overlaps the I/O of single job with the computation of other jobs.
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