pypi / billiard

billiard

What changed in billiard 4, from its official release notes, upgrade guides and advisories. Sources checked 2026-10-25.

8 breaking4 fixes and other

See which of these apply to your code, ranked, in your agent:

npx @unstale/cli init

billiard 412 changes

Pool numeric arguments processes, timeouts, and limits reject bool values.
4.3.1release notes
Pool rejects non-positive maxtasksperchild values.
4.3.1release notes
Closing a Process that is still running is refused.
4.3.1release notes
Using a closed Queue raises ValueError.
4.3.1release notes
The Python version requirement is now 3.10.
4.3.0release notes
On darwin, the default start method is now spawn to avoid a macOS fork-safety crash.
4.3.0release notes
MemoryError raised by pool callbacks is propagated.
4.3.0release notes
BaseException raised in pool workers is propagated.
4.3.0release notes

Pool rejects a process count below one.
4.3.1release notes
A shutdown SystemExit is no longer reported as the job's result.
4.3.1release notes
Made einfo compatible with inspect.
4.3.0release notes
A pool worker exits after a task raises SystemExit or KeyboardInterrupt.
4.3.0release notes