Interrupts

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,

PRINCIPLES OF I/O SOFTWARE
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PRINCIPLES OF I/O SOFTWARE

Let us now turn our attention from the I/O hardware to the I/O software. First we will consider the goals of the I/O software and then at the various ways I/O can be done from the point of view of the operating system.

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