History
C. A. R. Hoare and Per Brinch Hansen developed the idea of monitors around 1972, based on earlier ideas of their own and of E. W. Dijkstra. Brinch Hansen was the first to implement monitors. Hoare developed the theoretical framework and demonstrated their equivalence to semaphores.
Monitors were soon used to structure inter-process communication in the Solo operating system.
Programming languages that have supported monitors include
- Ada since Ada 95 (as protected objects)
- C# (and other languages that use the .NET Framework)
- Concurrent Euclid
- Concurrent Pascal
- D
- Delphi (Delphi 2009 and above, via TObject.Monitor)
- Java (via the wait and notify methods)
- Mesa
- Modula-3
- Python (via threading.Condition object)
- Ruby
- Squeak Smalltalk
- Turing, Turing+, and Object-Oriented Turing
- μC++
A number of libraries have been written that allow monitors to be constructed in languages that do not support them natively. When library calls are used, it is up to the programmer to explicitly mark the start and end of code executed with mutual exclusion. Pthreads is one such library.
Read more about this topic: Monitor (synchronization)
Famous quotes containing the word history:
“It is true that this man was nothing but an elemental force in motion, directed and rendered more effective by extreme cunning and by a relentless tactical clairvoyance .... Hitler was history in its purest form.”
—Albert Camus (1913–1960)
“Humankind has understood history as a series of battles because, to this day, it regards conflict as the central facet of life.”
—Anton Pavlovich Chekhov (1860–1904)
“I assure you that in our next class we will concern ourselves solely with the history of Egypt, and not with the more lurid and non-curricular subject of living mummies.”
—Griffin Jay, and Reginald LeBorg. Prof. Norman (Frank Reicher)