Test and Test-and-set
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-set is 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:
Exit protocol is:
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:

This is an excerpt from the article Test and Test-and-set from the Wikipedia free encyclopedia. A list of authors is available at Wikipedia.
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Test and Test-and-set - Wikipedia, the free encyclopedia
In computer science, the test-and-set CPU instruction is used to implement mutual exclusion in multiprocessor environments. Although a correct lock can be  ...
en.wikipedia.org/wiki/Test_and_Test-and-set
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Test-and-set - Wikipedia, the free…
In computer science, the test-and-set instruction is an instruction used to write to a memory location and return its old value as a single atomic (i.e., non ...
en.wikipedia.org/wiki/Test-and-set
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Test-And-Test-And-Set Lock | ASKLDJD
Mar 31, 2010 ... After I learned that Compare-And-Swap (CAS) has an infinite consensus number, I felt like I can rule the world with it. Well, maybe not quite, but ...
askldjd.wordpress.com/2010/03/31/test-and-test-and-set-lock/
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Implementation of Locks : 15-418 Spring 2013 - (CMU 15-418) From
Apr 5, 2013 ... The Test and Set instruction (ts) atomically loads the given memory address and sets the value at the memory address to be one. We can now ...
15418.courses.cs.cmu.edu/spring2013/article/31
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Review: Test-and-set spinlock - Stanford Secure Computer Systems ...
Review: Test-and-set spinlock struct var { int lock; int val;. }; void atomic_inc (var * v) { while (test_and_set (&v->lock)). ; v->val++; v->lock = 0;. } void atomic_dec ...
www.scs.stanford.edu/07au-cs140/notes/l4.pdf
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Locks
Nov 8, 2010 ... Test-and-set (TAS) locks. TATAS locks & backoff. Queue-based locks. Parallel performance. Hierarchical locks ...
www.cl.cam.ac.uk/teaching/1011/R204/2010-11nov-08-2-locks.pdf
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Using Test and Set for Mutual Exclusion Semaphores
1. 1. 1. CMSC 412. Using Test and Set for Mutual Exclusion repeat while test-and-set(lock);. // critical section lock = false;. // non-critical section until false;.
www.cs.umd.edu/~keleher/412/lect7.pdf
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atomic test and set | VMware vSphere Blog - VMware Blogs
May 4, 2012 ... In the post, I stated that the 'Hardware Acceleration primitive, Atomic Test & Set ( ATS), is now used throughout VMFS-5 for file locking.
blogs.vmware.com/vsphere/tag/atomic-test-and-set
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Benefits of Atomic Test and Set (ATS) with IBM Storwize family ...
Jun 25, 2013 ... As the regular author of this blog I wanted to provide a short introduction for a guest contributor Over the past few months I have been ...
virtualstoragespeak.wordpress.com/2013/06/25/benefits-of-atomic-test-and-set-ats-with-ibm-storwize-family/
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How to test and set a Chinese (China)…
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Microprocessors and Microcomputer-Based System Design
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W (Al), the operation F000,6-0000,6 is performed internally by the 68000, Z is cleared to zero, and N is set to 1. V and C flags are always cleared to zero. 5.5.2.f Test and Set Instruction A multiprocessor system includes a mechanism to safely  ...
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Algorithms and Computation: 5th International Symposium, ...
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Ding-Zhu Du, Xiang-Sun Zhang, 1994
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Wiley CPAexcel Exam Review 2014 Test Bank, Complete Set
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O. Ray Whittington, 2013
All the information you need to pass the CPA exam on your ownUpdated annually with the latest AICPA content guidelines, this comprehensive practice software for the Uniform CPA Examination replicates the real exam experience to arm users with the test-taking practice they need to succeed at the testing center on exam day. With over 4,300 multiple c...
Computer Architecture and Implementation
Computer Architecture and Implementation
Harvey G. Cragon, 2000
TABLE 8.20 INTEL PENTIUM SYNCHRONIZATION INSTRUCTION Name Mnemonic Function Lock Turns the accompanying instruction into an atomic instruction Bit test and set BTS Stores the addressed bit in the CF flag and sets the ...
Distributed Algorithms: An Intuitive Approach
Distributed Algorithms: An Intuitive Approach
Wan Fokkink, 2013
no other process can acquire the lock until p unlocks by setting locked to false. The test-and-set lock moreover is livelock-free, but not starvation-free. The test-and-set lock, although conceptually simple, tends to have a poor performance.
Wiley CPA Exam Review 2013 Test Bank CD, Complete Set
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INCLUDES ONE-YEAR ACCESS TO CPATestBank.comCD contains PIN code providing access to the Online Test Bank for one yearSync all your practice sessions to CPATestBank.com for backup and anytime access from any PC or MacDownload new question sets from CPATestBank.comOnline updates ensure you always have the most current contentHighly organized, up to d...
Distributed Computing: 24th International Symposium, DISC ...
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Nancy A. Lynch, Alexander A. Shvartsman, 2010
To simplify the exposition, we modify the algorithm so that processes always pick the nexttest-and-setto access uniformlyat random, withoutdiscarding test- and-set objects that have been accessed previously. ReShuffle can be seen as a ...
Gold Standard Dental Admission Test (DAT) Comprehensive Review, Practice Tests and Online Access Card Complete...
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The Gold Standard DAT includes an ambitious and comprehensive review of all DAT subjects. Natural Science (NS) subjects are covered in remarkable detail with full-color illustrations (biology, general and organic chemistry) plus a thorough preparation for QR, and innovative strategies for PAT and RC. In the books and online, we provide over 2000 pr...
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