Follow FreeBSD 11's do_sem_wait and do_sem_wake (COMPAT_FREEBSD9/10) on
a struct _usem: a wait sets _has_waiters, returns at once while _count
is non-zero and otherwise sleeps on the semaphore's queue; a wake clears
_has_waiters when one waiter is left and releases one waiter.
Co-Authored-By: Claude Haiku 5.5 <[email protected]>
Operation 1 threw as unverified, so a title whose call_once path reaches it
stopped. In a payload process on a PS5 (firmware 12.70) operations 0 and 1
fail with EOPNOTSUPP and leave the word unchanged for every word tried,
as FreeBSD 11's __umtx_op_unimpl does. Answer operation 1 like operation 0.
Titles that ship their own libc.prx or Unity's PS5Util.prx import
_umtx_op (04AjkP0jO9U) for atomic waits, call_once and futex-style
waits. Implement UMTX_OP_WAIT, UMTX_OP_WAKE, UMTX_OP_WAIT_UINT,
UMTX_OP_WAIT_UINT_PRIVATE and UMTX_OP_WAKE_PRIVATE as FreeBSD 11's
kern_umtx.c does, on the sceKernelSyncOnAddressWait waiter queue.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01HeC9bA3n74TzJRYv9AgBE8
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