A high-performance striped resource pooling implementation for Haskell based on
QSem.
Changes
resource-pool-0.5.0.1 (2026-07-08)
Fix a bug where a thread waiting for a resource would get stuck in the queue
indefinitely if resource creation failed in another thread.
Fix a potential out-of-bounds array access in stripe selection when the hash
of a thread id is negative.
Fix a bug where some of the stripes would never be used if the number of
stripes was larger than the number of capabilities.
Add a test suite.
resource-pool-0.5.0.0 (2025-06-13)
Drop support for GHC < 8.10.
Use STM based lockless implementation as it results in much better throughput
in a multi-threaded environment when number of stripes is not equal to the
number of capabilities (in particular with a single stripe).
Stop running resource freeing functions within uninterruptibleMask.
destroyResource no longer ignores exceptions thrown from resource releasing
functions.
Change the default number of stripes to 1.
Do not exceed the maximum number of resources if the number of stripes does
not divide it.
Add support for assigning a label to the pool.
resource-pool-0.4.0.0 (2023-01-16)
Require poolMaxResources to be not smaller than the number of stripes.
Add support for setting the number of stripes.
Hide the constructor of PoolConfig from the public API and provide
defaultPoolConfig so that future additions to PoolConfig don’t require
major version bumps.
resource-pool-0.3.1.0 (2022-06-15)
Add tryWithResource and tryTakeResource.
resource-pool-0.3.0.0 (2022-06-01)
Rewrite based on Control.Concurrent.QSem for better throughput and latency.
Make release of resources asynchronous exceptions safe.
