v1.3.7

There are 3 security fixes in this release, so updating is recommended.
These security vulnerabilities are not very likely to be hit in practice and have a corresponding Low severity score.

What's Changed

• CVE-2026-54904 AtomicReference#update livelocks when the stored value is Float::NAN. Fix by @joshuay03 and @eregon
• CVE-2026-54905 ReentrantReadWriteLock read-count overflow grants a write lock without exclusivity. Fix by @joshuay03
• CVE-2026-54906 ReadWriteLock allows wrong-thread write release and stray read-release counter corruption. Fix by @joshuay03
• concurrent-ruby-ext: fix build on Darwin 32-bit by @barracuda156 in #1064
• Add SECURITY.md by @eregon in #1104
• Add Ruby 4.0 in CI by @eregon in #1106

New Contributors

• @barracuda156 made their first contribution in #1064

Full Changelog: v1.3.6...v1.3.7

v1.3.6

What's Changed

• Run tests without the C extension in CI by @eregon in #1081
• Fix typo in Promise docs by @danieldiekmeier in #1083
• Correct word in readme by @wwahammy in #1084
• Fix mistakes in MVar documentation by @trinistr in #1087
• Fix multi require concurrent/executor/cached_thread_pool by @OuYangJinTing in #1085
• Use typed data APIs by @nobu in #1096
• Add Joshua Young to the list of maintainers by @eregon in #1097
• Asynchronous pruning for RubyThreadPoolExecutor by @joshuay03 in #1082
• Mark RubySingleThreadExecutor as a SerialExecutorService by @meineerde in #1070
• Allow TimerTask to be safely restarted after shutdown and avoid duplicate tasks by @bensheldon in #1001
• Flaky test fix: allow ThreadPool to shutdown before asserting completed_task_count by @bensheldon in #1098
• ThreadPoolExecutor#kill will wait_for_termination in JRuby; ensure TimerSet timer thread shuts down cleanly by @bensheldon in #1044

New Contributors

• @danieldiekmeier made their first contribution in #1083
• @wwahammy made their first contribution in #1084
• @trinistr made their first contribution in #1087
• @OuYangJinTing made their first contribution in #1085
• @nobu made their first contribution in #1096
• @joshuay03 made their first contribution in #1082

Full Changelog: v1.3.5...v1.3.6

v1.3.5

What's Changed

• Remove dependency on logger by @eregon in #1062
• Avoid error when member is present on ancestor class by @francesmcmullin in #1068
• Set rake-compiler source and target to Java 8 by @headius in #1071
• chore: fix typos by @chenrui333 in #1076

New Contributors

• @francesmcmullin made their first contribution in #1068
• @chenrui333 made their first contribution in #1076

Full Changelog: v1.3.4...v1.3.5

v1.3.4

What's Changed

• Update comment for JRuby variant of processor_count to reality by @meineerde in #1054
• Add Concurrent.cpu_requests that is cgroups aware. by @heka1024 in #1058
• Fix the doc of Concurrent.available_processor_count by @y-yagi in #1059
• Fix the return value of Concurrent.available_processor_count when cpu.cfs_quota_us is -1 by @y-yagi in #1060

New Contributors

• @heka1024 made their first contribution in #1058
• @y-yagi made their first contribution in #1059

Full Changelog: v1.3.3...v1.3.4

v1.3.3

What's Changed

• Improve speed for windows Get-CimInstance by @Earlopain in #1053

Full Changelog: v1.3.2...v1.3.3

v1.3.2

What's Changed

• Fix method name in CHANGELOG.md by @nertzy in #1049
• Remove dependency on win32ole by @Earlopain in #1051

New Contributors

• @nertzy made their first contribution in #1049
• @Earlopain made their first contribution in #1051

Full Changelog: v1.3.1...v1.3.2

Edge 0.7.1

• (#1052) Fix dependency on concurrent-ruby to allow the latest release.

v1.3.1

This release is essentially v1.3.0, but with a properly packaged gem. There was an issue publishing v1.3.0 and that gem needed to be yanked to avoid breaking downstream projects. The v1.3.0 changelog is reproduced below.

What's Changed

• Add Concurrent.usable_processor_count that is cgroups aware by @casperisfine in #1038
• Align Java Executor Service behavior for shuttingdown?, shutdown? by @bensheldon in #1042

New Contributors

• @dependabot made their first contribution in #1028
• @kkohrt made their first contribution in #1037

Full Changelog: v1.2.3...v1.3.1

v1.3.0

There was a packaging issue that resulted in a broken v1.3.0 gem having been pushed to RubyGems. The code corresponding to this tag is fine to use, but there is no corresponding v1.3.0 gem as we had to yank it. Please use v1.3.1 instead, which is nothing more than v1.3.0 packaged correctly.

What's Changed

• Add Concurrent.usable_processor_count that is cgroups aware by @casperisfine in #1038
• Align Java Executor Service behavior for shuttingdown?, shutdown? by @bensheldon in #1042

New Contributors

• @dependabot made their first contribution in #1028
• @kkohrt made their first contribution in #1037

Full Changelog: v1.2.3...v1.3.0

v1.2.3

What's Changed

• Fix TimerTask :execution_interval docs by @freemanoid in #994
• Fix TimerTask docs to not refer to #execute as "blocking" by @bensheldon in #996
• Fix TimerTask example output by @bensheldon in #1003
• Fix broken CI due to rake-compiler error on Ruby < 2.6 by @mattbrictson in #1007
• Fix doc typo: yeild → yield by @mattbrictson in #1006
• Fix DaemonThreadFactory - reuse single Java thread factory by @obulkin in #1009
• Fix sporadic failures testing with JRuby by @headius in #1012
• Allow TimerSet to safely handle an executor raising RejectedExecutionError by @bensheldon in #999
• Use executor from arg in then_on/rescue_on/chain_on for Promises by @tgwizard in #1005
• Allow TimerTask to be initialized with a specified Executor by @bensheldon in #1000
• Create method ThreadPoolExecutor#active_count to expose the number of threads that are actively executing tasks by @bensheldon in #1002
• Drop dependency on mutex_m by @casperisfine in #1013
• Fix compile error on FreeBSD 14 by @janbiedermann in #1014
• Fix spurious return in Promises#wait_until_resolved by @eregon in #1016
• Remove AtomicReferenceMapBackend and CheapLockable by @eregon in #1018
• Add Ruby 3.3 in CI by @eregon in #1021
• docs: fix typo in throttle docs by @G-Rath in #1024
• docs: update promises grammar by @G-Rath in #1026
• Add TimerTask#interval_type option to configure interval calculation by @bensheldon in #997

New Contributors

• @freemanoid made their first contribution in #994
• @bensheldon made their first contribution in #996
• @mattbrictson made their first contribution in #1007
• @obulkin made their first contribution in #1009
• @headius made their first contribution in #1012
• @tgwizard made their first contribution in #1005
• @janbiedermann made their first contribution in #1014
• @G-Rath made their first contribution in #1024

Full Changelog: v1.2.2...v1.2.3