August 2015
Intermediate to advanced
286 pages
5h 42m
English
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Thread synchronization with semaphores
Invented by E. Dijkstra and used for the first time in the operating system, a semaphore is an abstract data type managed by the operating system, used to synchronize the access by multiple threads to shared resources and data. Essentially, a semaphore is constituted of an internal variable that identifies the number of concurrent access to a resource to which it is associated.
Also, in the threading module, the operation of a semaphore is based on the two functions acquire() and release(), as explained:
- Whenever a thread wants to access a resource that is associated with a semaphore, it must invoke the
acquire()operation, which decreases the internal variable of the semaphore and allows access to the resource ...
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