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Let ready IO yield to other runnable computations - #1723
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Lorenzobattistela merged 4 commits intoOct 19, 2026
Merged
Lorenzobattistela merged 4 commits into
Lorenzobattistela merged 4 commits into
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oxura
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Ready effects now yield every 64 steps, so a loop of IO.now reads no longer holds the event loop. The sender's 1 ms timer fired mid-hold and the test deadlocked on every lane. A single 20 ms foreign effect holds the loop within one turn, so both timers are still overdue together. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Lorenzobattistela
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Oct 19, 2026
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Fixes #1719.
A parent could keep issuing ready effects forever without giving its spawned child a turn. Bound a turn to 64 ready effects on C and JS; this does not preempt pure code or cancel losing computations.
Removed the JS queue optimizations following #1644, so #1720 is not addressed here. Runnable arrays and channel queues keep their reference implementation; the requeued runnable record is reused. GUIDE.md is unchanged.
tests/io/chan_try_late.bendheld the loop with a run ofIO.nowreads, which now yields; it holds the loop with one blocking 20 ms foreign effect instead (.c/.jstwins), so both timers are still overdue together.The deterministic progress test prints
73on Bun and native C. The earlier before/after timeout reproducers remain in #1719.