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  • win64-main-63b440e 63b440efcd

    [HLE] Fix guest-thread sync and boot for Unreal Engine titles (#102)

    Ghost released this 2026-07-13 11:59:38 -04:00 | 507 commits to 1016_part3 since this release

    • [HLE] Fix guest-thread sync and boot for Unreal Engine titles

    Silent Hill: The Short Message (and other UE titles) now boot the full
    engine thread graph instead of hanging early. Four related fixes:

    • pthread cond/mutex semantics: retain a signal raised with no waiter as
      pending, and key block/wake on the state's identity rather than a
      resolved address that could differ between lock and unlock. This ends
      the ~1.5M-call cond_wait busy-spin.

    • Warm HLE type initializers and force-JIT their methods on a host thread
      at Freeze(). A .cctor or first-time JIT running on a guest thread's
      hijacked stack fail-fasts the CLR as "Invalid Program: attempted to
      call a UnmanagedCallersOnly method from managed code".

    • Guest thread scheduling: pump after a wake so a readied thread actually
      runs, add a dispatcher thread for when every guest thread is parked,
      and make the pump-depth guard an atomic CAS.

    • Route mutex/rwlock lock/unlock off the non-blocking leaf-import fast
      path so a contended lock can deschedule its guest thread.

    Ported from the unreal-boot-fixes branch.

    • [HLE] Keep mutex/rwlock unlock on the leaf-import fast path

    The previous change routed all mutex/rwlock lock and unlock NIDs off the
    leaf fast path so a contended lock could deschedule its guest thread. But
    unlock never blocks, and taking it off the fast path made it slow enough
    that Demon's Souls' job workers livelocked in a guest spinlock (millions
    of mutex_unlock calls, no import progress, main thread stuck in
    sceKernelWaitEventFlag).

    Only lock needs to leave the leaf path. Restore the four unlock NIDs
    (mutex + rwlock) so guest spinlocks stay cheap, while lock/rd/wrlock
    remain off it for the blocking case Silent Hill needs.

    • [HLE] Gate pthread_mutex_lock guest-thread blocking (fixes Demon's Souls)

    Re-enabling cooperative deschedule on a contended pthread_mutex_lock
    regressed Demon's Souls: its job workers run on libSceFiber, and blocking
    a guest thread mid-fiber left sceFiberSwitch returning ESRCH followed by
    a null fiber-context deref (0xC0000005). Bisect confirmed the pthread
    change as the cause; the game reaches the same point as before it once
    the block is skipped.

    Gate the block behind SHARPEMU_MUTEX_LOCK_BLOCKING (off by default) so
    contended locks fall through to the synchronous host-thread wait. The
    rest of the pthread fixes (cond_wait pending signals, identity wake keys)
    are unaffected.

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