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HASUMI Hitoshi 458078f10e Introduce Task::Queue
- This patch implements `Task::Queue` mirroring `Thread::Queue` in CRuby.
- Producer/Consumer pattern is now possible with no polling

## No Top-level pollution
- No top-level `Queue` defined
- No `TaskError`. Instead, `Task::Error` happens when `Task::Queue#pop(true)` when empty
- No `ClosedQueueError`. `Task::Error` also happens when pushing to closed queue

## Future Work
- `Task::SizedQueue`
2026-05-18 14:23:42 +09:00
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2026-05-18 14:23:42 +09:00