Where several asynchronous processes are required to coordinate their access to a critical resource, they do so by controlled access to a semaphore. A process wishing to access the resource issues a P operation that inspects the value of the semaphore; the value indicates whether or not any other process has access to the critical resource. If some other process is using the resource then the process issuing the P operation will be suspended. A process issues a V operation when it has finished using the critical resource. The V operation can never cause suspension of the issuing process but by operating on the value of the semaphore may allow some other cooperating process to commence operation.
"critical resource." A Dictionary of Computing. . Encyclopedia.com. (April 19, 2019). https://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/critical-resource
"critical resource." A Dictionary of Computing. . Retrieved April 19, 2019 from Encyclopedia.com: https://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/critical-resource
Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).
Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.
Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:
Modern Language Association
The Chicago Manual of Style
American Psychological Association
- Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
- In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.