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Transactional Locking II
TLDR
This paper introduces the transactional locking II (TL2) algorithm, a software transactional memory (STM) algorithm based on a combination of commit-time locking and a novel global version-clock based validation technique, which is ten-fold faster than a single lock.
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Split-ordered lists: lock-free extensible hash tables
TLDR
Empirical tests show the first lock-free implementation of an extensible hash table running on current architectures provides concurrent insert, delete, and search operations with an expected O(1) cost and is well suited for real-time applications.
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Using elimination to implement scalable and lock-free FIFO queues
TLDR
Empirical evaluation shows that by using elimination as a backoff technique for the Michael and Scott queue algorithm, the algorithm can achieve comparable performance at low loads, and improved scalability as load increases.
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The Baskets Queue
TLDR
The Baskets Queue is presented - a new, highly concurrent lock-free linearizable dynamic memory FIFO queue that creates baskets of mixed-order items instead of the standard totally ordered list and outperforms the original MS-queue algorithm in various benchmarks.
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Split-ordered lists: Lock-free extensible hash tables
TLDR
Though lock-free algorithms are expected to work best in multiprogrammed environments, empirical tests show that the new algorithm performs as well as the most efficient known lock-based resizable hash-table algorithm, and in high load cases it significantly outperforms it.
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Predictive log-synchronization
TLDR
Predictive log-synchronization can boost read-only throughput by significantly reducing the overhead of coordination among concurrent operations, and provides a way to simplify concurrent data structures.
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Transient blocking synchronization
TLDR
It is claimed that the semantics of non-blocking synchronization primitives such as Compare &Swap and LoadLinked/StoreConditional on the one hand, and blocking ones such as Full/Empty-bits on the other, will introduce high communication and space costs when implemented on large scale machines.
Calix[6]arene Derivatives with Differently Modified Bridges
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Incorporation of three or two distal double bonds at the methylene bridges of the calix[4]arene scaffold.
TLDR
Acetylation or alkylation of the tetrahydroxytrioxocalix[4]arene 6 with acetic anhydride and 1-bromobutane, respectively, afforded exclusively a single atropisomer of the product, which in both cases were characterized as the 1,3-alternate form.
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C-Me Bond Formation at All Methylene Bridges of the Calix[4]arene Scaffold.
A reaction of a distal dibromo diketocalix[4]arene with excess MeLi, followed by acid-catalyzed dehydration, yields a derivative with a pair of opposite exocyclic double bonds, and a pair of trans…
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