@hackage stm-io-hooks1.1.2

Launch your IO-actions from within the STM monad

This library provides a Software Transactional Memory (STM) monad with commit and retry IO hooks. A retry-action is run (at least once) if the transaction retries, while comm it-actions are executed iff the transaction commits. The AdvSTM monad also gives some atomicity guarantees for commit-actions:

  • When a TVar is modified in a transaction and this transaction commits, the update remains invisible to other threads until the corresponding onCommit action is run.

  • If the onCommit action throws an exception, the original values of the modified TVars are restored.

Note: The package can be used as a drop-in replacement for 'Control.Concurrent.STM'.