* Use atomic waitables instead instead of global thread wait as often as possible.
* Add ::is_stopped() and and ::is_paued() which can be used in atomic loops and with atomic wait. (constexpr cpu flags test functions)
* Fix notification bug of sys_spu_thread_group_exit/terminate. (old bug, enhanced by #9117)
* Function time statistics at Emu.Stop() restored. (instead of current "X syscall failed with 0x00000000 : 0")
* Fix a corner case where SPU thread has the same ID as a PPU thread.
* Fix a potential deadlock on Emu.Stop() while sending event in EBUSY loop.
* Thread specific notifications.
* Correct error code to EBUSY.
* lv2_obj::awake was called even when EBSUY should be returned.
* Fix sys_ppu_thread_create for a newly created thread with the same id as ppu_thread::id_base. (can happen if main thread exited before its creation)
* Make PPU id removal after exit atomic with descheduling
* Make joining thread scheduling atomic with thread exit sleep.
* Update sys_ppu_thread_stop/restart.
* Add idm::remove_verify.
With the option enabled GET commands are blocked until the current PUTLLC/PUTLLUC executer on that address finishes
Additional improvements:
- Minor race fix of sys_ppu_thread_exit (wait until the writer finishes)
- Max number of ppu threads bumped to 8
* Implement both RawSPU and threaded SPU page fault recovery
* Guard page_fault_notification_entries access with a mutex
* Add missing lock in sys_ppu_thread_recover_page_fault/get_page_fault_context
* Fix EINVAL check in sys_ppu_thread_recover_page_fault, previously when the event was not found begin() was erased and
CELL_OK was returned.
* Fixed page fault recovery waiting logic:
- Do not rely on a single thread_ctrl notification (unsafe)
- Avoided a race where ::awake(ppu) can be called before ::sleep(ppu) therefore nop-ing out the notification
* Avoid inconsistencies with vm flags on page fault cause detection
* Fix sys_mmapper_enable_page_fault_notification EBUSY check
from RE it's allowed to register the same queue twice (on a different area) but not to enable page fault notifications twice
