julia

799f94e2 - src: Discriminate FreeBSD rescue-timer SIGINTs and bound abandon delivery

src: Discriminate FreeBSD rescue-timer SIGINTs and bound abandon delivery Two delivery-robustness fixes found chasing the cancellation test failures on the slower CI platforms: FreeBSD selects the POSIX-timer rescue mechanism, whose SIGINT is told apart from a user press by sigwaitinfo's SI_TIMER si_code - but every sigwaitinfo use was guarded by _POSIX_C_SOURCE >= 199309L, which glibc defines through _GNU_SOURCE and FreeBSD does not define at all. The signal listener there fell back to plain sigwait, so a rescue-timer expiry was indistinguishable from a user ^C: no escalation warning could ever print, the expiry was never recorded (so the direct-abandonment gate never opened), and each phantom "press" re-armed the timer. That left the REPL pty ladder on FreeBSD completely dead after the first press. Gate these paths on a new HAVE_SIGWAITINFO that includes FreeBSD, where sigwaitinfo is available regardless of the feature macro. jl_abandon_task's delivery-retry loop was bounded by iteration count (200 sends x 10 x uv_sleep(1)), nominally ~2s - but every uv_sleep is a reschedule, and on an oversubscribed or serialized machine (CI under load, rr) the loop stretched to minutes per call. The unsafe_abandon! testsets spam that call in a 20s wall-clock loop, blowing through the parent's subprocess watchdog on the rr job. Bound the loop by wall clock instead. Relatedly, jl_thread_suspend_and_get_state asserted the per-thread signal request slot held no request, but a parked best-effort cancellation (5) or abandon (6) whose victim never consumes signals (e.g. SIGUSR2 blocked) can occupy it indefinitely; both senders tolerate a displaced delivery. Seen as an abort in assert builds when a termination signal arrived while an abandon request was pending. CI failure: https://buildkite.com/julialang/julia-pr/builds/392#019f59bc-6691-42e6-aa26-0fe946612248 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015KLwCBAR64r3cTdfaC5krU