A wake's handoff waited until every runnable higher-priority thread pinned to the caller's core was blocked, not only the ones the wake made runnable. The host runs a lower-priority thread beside such threads at all other times, and a core's busy loaders, workers and pollers are seldom all blocked at once, so the wait had no bound. Tears of the Kingdom 1.4.3 (issue #247) stayed on an empty scene after the boot logos: on 82ab25b, 84 functions / 771 NVN calls a frame, no packaged texture uploaded, 250,008 ms of handoff waits in a 180 s run; a temporary log showed BootupBackgroundWorkThread (priority 58) waiting 200-290 ms at a time for ARes Loading 1, Presentation Thread and BaseProcExecutor. Donkey Kong Country: Tropical Freeze's priority-58 job thread waited the same way for pollers (issue #259, section 6).
A wake now records the woken thread in the waker's current handoff and in those the waker belongs to (note_runnable, at most four), so Metroid Dread's main thread still waits for its movie dispatcher and for the worker the dispatcher wakes. Blocking, a sleep, YieldToAnyThread (SleepThread -2, which on Horizon takes the thread off its core so that lower-priority threads run there), exit, suspension and host GPU work end a thread's hold; a handoff ends when its caller's thread SVC returns (hand_epoch). There is still no timeout, and core_preempt keeps checking every runnable peer.
Checked on the Mac, without shader libraries for chain 8393d85a4eae (draws skipped): TotK on the issue #70 route for 180 s, 1,221 ms of handoff waits and the same per-frame NVN call counts and texture first uploads as 9feac2f (before the unbounded handoff). Dread, fresh saves, DM_KEYS=4:A*20/0.7, 60 s: a control host with the handoff off crashed in 1 of 3 runs at sdk+0x347eb4 from main+0x225338; the limited handoff passed 12 of 12 runs, each through three decoders and two teardowns with about 12,400 handoffs. t_preempt adds three handoff-scope cases: a busy peer nobody woke (main's code never returns), a worker woken by the woken dispatcher (fails without the recorded chain), a woken thread yielding to any thread (never returns without that rule). Host tests, docs tests and an iOS syntax check of hle_thread.c pass. Gameplay with shaders, iOS and DKC itself are not checked here.
Co-authored-by: HougeLangley <1161594+HougeLangley@users.noreply.github.com>
Co-authored-by: aurlight <120410928+aurlight@users.noreply.github.com>
Apply PR #202's host-thread skip and duplicate vsync suppression. Give
bindings unique lifetime IDs so a retired worker cannot signal another
service's event after guest storage and kernel handles are reused. Replace
the eight-entry worker table with allocated records so rapid replacement
does not abort while retired workers wait for their next tick.
Add deterministic regression cases through real event binding and SVCs,
and document the mechanism with an updated symptom index. Both the
capacity abort and stale signal reproduce against the original PR.
Co-authored-by: Aleksandr Svidchenkov <a.svidchenkov@gmail.com>
Use guest runnable state after a higher-priority same-core wake instead of Mach dispatch state or a 5 ms cutoff. Honour wake handoffs for every game and remove Metroid Dread request-ring gates and its core_preempt setting.
Validate event, mutex and condition-variable handoffs with delayed host dispatch; 13 valid Dread movie-transition runs passed. Host tests, docs and shader-chain checks passed, along with an iOS syntax check. Record Wonder boot comparison and pending iOS runtime validation.
