Semaphore

Semaphores
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Semaphores

This was the position in 1965, when E. W. Dijkstra (1965) suggested using an integer variable to count the number of wakeups saved for future use. In his suggestion, a new variable type, which he called a semaphore, was introduced. A semaphore could have the value 0,

When to Schedule
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When to Schedule

A major issue related to scheduling is when to make scheduling decisions. It turns out that there are a variety of situations in which scheduling is required. First, when a new process is created, a decision needs to be made whether to run the parent process or the child

The Readers and Writers Problem
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The Readers and Writers Problem

The dining philosophers problem is useful for modeling processes that are competing for exclusive access to a limited number of resources, such as I/O devices. Another well-known problem is the readers and writers problem (Courtois et al., 1971), which models access to a

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