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- Test_and_Test-and-set abstract "In computer science, the test-and-set CPU instruction is used to implement mutual exclusion in multiprocessor environments. Although a correct lock can be implemented with test-and-set, it can lead to resource contention in busy lock (caused by bus locking and cache invalidation when test-and-set operation needs to access memory atomically).To lower the overhead a more elaborate locking protocol test and test-and-setis used. The main idea is not to spin in test-and-set but increase the likelihood of successful test-and-set by using the following entry protocol to the lock:boolean locked := false // shared lock variableprocedure EnterCritical { do { while (locked == true) skip // spin until lock seems free } while TestAndSet(locked) // actual atomic locking}Exit protocol is:procedure ExitCritical { locked := false}The entry protocol uses normal memory reads to spin, waiting for the lock to become free. Test-and-set is only used to try to get the lock when normal memory read says it's free. Thus the expensive atomic memory operations happens less often than in simple spin around test-and-set.If the programming language used supports short-circuit evaluation, the entry protocol could be implemented as: procedure EnterCritical { while ( locked == true or TestAndSet(locked) == true ) skip // spin until locked }".
- Test_and_Test-and-set wikiPageID "2084574".
- Test_and_Test-and-set wikiPageRevisionID "517412340".
- Test_and_Test-and-set hasPhotoCollection Test_and_Test-and-set.
- Test_and_Test-and-set subject Category:Computer_arithmetic.
- Test_and_Test-and-set subject Category:Concurrency_control.
- Test_and_Test-and-set comment "In computer science, the test-and-set CPU instruction is used to implement mutual exclusion in multiprocessor environments. Although a correct lock can be implemented with test-and-set, it can lead to resource contention in busy lock (caused by bus locking and cache invalidation when test-and-set operation needs to access memory atomically).To lower the overhead a more elaborate locking protocol test and test-and-setis used.".
- Test_and_Test-and-set label "Test and Test-and-set".
- Test_and_Test-and-set sameAs m.06l3ny.
- Test_and_Test-and-set sameAs Q7705745.
- Test_and_Test-and-set sameAs Q7705745.
- Test_and_Test-and-set wasDerivedFrom Test_and_Test-and-set?oldid=517412340.
- Test_and_Test-and-set isPrimaryTopicOf Test_and_Test-and-set.