NDLI: AutoSynch:an automatic-signal monitor based on predicate tagging

Content Provider	ACM Digital Library
Author	Hung, Wei-Lun Garg, Vijay K.
Abstract	Most programming languages use monitors with explicit signals for synchronization in shared-memory programs. Requiring programmers to signal threads explicitly results in many concurrency bugs due to missed notifications, or notifications on wrong condition variables. In this paper, we describe an implementation of an automatic signaling monitor in Java called AutoSynch that eliminates such concurrency bugs by removing the burden of signaling from the programmer. We show that the belief that automatic signaling monitors are prohibitively expensive is wrong. For most problems, programs based on AutoSynch are almost as fast as those based on explicit signaling. For some, AutoSynch is even faster than explicit signaling because it never uses signalAll, whereas the programmers end up using signalAll with the explicit signal mechanism. AutoSynch} achieves efficiency in synchronization based on three novel ideas. We introduce an operation called closure that enables the predicate evaluation in every thread, thereby reducing context switches during the execution of the program. Secondly, AutoSynch avoids signalAll by using a property called relay invariance that guarantees that whenever possible there is always at least one thread whose condition is true which has been signaled. Finally, AutoSynch uses a technique called predicate tagging to efficiently determine a thread that should be signaled. To evaluate the efficiency of AutoSynch, we have implemented many different well-known synchronization problems such as the producers/consumers problem, the readers/writers problems, and the dining philosophers problem. The results show that AutoSynch is almost as efficient as the explicit-signal monitor and even more efficient for some cases.
Starting Page	253
Ending Page	262
Page Count	10
File Format	PDF
ISSN	03621340 15581160
DOI	10.1145/2499370.2462175
Journal	ACM SIGPLAN Notices (SIGP)
Volume Number	48
Issue Number	6
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1983-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Concurrency Monitor Automatic signal Parallel Implicit signal Explicit signal
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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