The Semaphore's can be expressed as variable S, the subsequent S's can be stacked in ordered rank queue sorts of Hiarchichal slot Field Array Lists Iterating in tree traversal signal subroutines as: "S1[1, 2, ..., n^ ], S2[1, 2, ..., n^ ], ..., Sn[1, 2, ...,n^ ]"
They optimize the in memory cache, instruction heap for processing.
A semaphore is a variable or abstract data type used to control access to a common resource by multiple processes in a concurrent system such as a multitasking operating system.
A trivial semaphore is a plain variable that is changed (for example, incremented or decremented, or toggled) depending on programmer-defined conditions.
A useful way to think of a semaphore as used in the real-world systems is as a record of how many units of a particular resource are available, coupled with operations to adjust that record safely (i.e. to avoid race conditions) as units are required or become free, and, if necessary, wait until a unit of the resource becomes available.
Semaphores are a useful tool in the prevention of race conditions; however, their use is by no means a guarantee that a program is free from these problems. Semaphores which allow an arbitrary resource count are called counting semaphores, while semaphores which are restricted to the values 0 and 1 (or locked/unlocked, unavailable/available) are called binary semaphores and are used to implement locks.
The semaphore concept was invented by Dutch computer scientist Edsger Dijkstra in 1962 or 1963, when Dijkstra and his team were developing an operating system for theElectrologica X8. That system eventually became known as THE multiprogramming/thready, hyper/giga/ultra system.
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