Changelog for stm package

2.5.1.0 Aug 2022

• Teach flushTBQueue to only flush queue when necessary
• Introduce Control.Concurrent.STM.TMVar.writeTMVar
• Add Semigroup and Monoid instances for STM

2.5.0.2 Dec 2021

• Fix non-exhaustive patterns warning (#49)

• Document particulars of effect-rollback of Control.Monad.STM.throwSTM (#32)

2.5.0.1 May 2020

• Optimise implementation of peekTQueue and peekTBQueue to reduce probability of transaction conflicts.

2.5.0.0 Sep 2018

• Removed alwaysSucceeds and always, GHC’s invariant checking primitives. (GHC #14324)

• Add lengthTBQueue to Control.Concurrent.STM.TBQueue (gh-9)

• Add stateTVar :: TVar s -> (s -> (a, s)) -> STM a combinator (gh-14)

• Switched newTBQueue and newTBQueueIO to accept Natural as size (gh-17)

• Switched signalTSemN and newTSem to accept Natural and Integer respectively (gh-17)

2.4.5.1 Sep 2018

• Fix incorrect bookkeeping of write capacity in flushTBQueue (gh-9)

• Avoid redundant writeTVars in flushTQueue to avoid unnecessarily invalidating other transactions (gh-6)

2.4.5.0 Feb 2018

• Fix space leak in TBQueue (gh-2, GHC#14494)

• Make signalTSem resilient against Int overflows (gh-4)

• Make definition of readTQueue consistent with readTBQueue (gh-3, GHC#9539)

• Add flushTQueue to Control.Concurrent.STM.TQueue (gh-1)

• Add flushTBQueue to Control.Concurrent.STM.TBQueue (gh-1)

• Add signalTSemN operation (gh-5)

2.4.4.1 Dec 2015

• Add support for base-4.9.0.0

• Drop support for GHC 6.12 / base-4.2

2.4.4 Dec 2014

• Add support for base-4.8.0.0

• Tighten Safe Haskell bounds

• Add mkWeakTMVar to Control.Concurrent.STM.TMVar

• Add @since-annotations

2.4.3 Mar 2014

• Update behaviour of newBroadcastTChanIO to match newBroadcastTChan in causing an error on a read from the broadcast channel

• Add mkWeakTVar

• Add isFullTBQueue

• Fix TChan created via newBroadcastTChanIO to throw same exception on a readTChan as when created via newBroadcastTChan

• Update to Cabal 1.10 format

2.4.2 Nov 2012

• Add Control.Concurrent.STM.TSem (transactional semaphore)

• Add Applicative/Alternative instances of STM for GHC <7.0

• Throw proper exception when readTChan called on a broadcast TChan

2.4 Jul 2012

• Add Control.Concurrent.STM.TQueue (a faster TChan)

• Add Control.Concurrent.STM.TBQueue (a bounded channel based on TQueue)

• Add Eq instance for TChan

• Add newBroadcastTChan and newBroadcastTChanIO

• Some performance improvements for TChan

• Add cloneTChan