Is it possible to increase event states beyond 2?

[CaoZhongZ]

From document on event I read:

• An event only has two states: not signaled and signaled.
• An event can be appended into multiple command lists simultaneously.

Wouldn't it be more useful if the event has more than two states in this situation, like 32-bit states? With some API like:
zeCommandListAppendSignalEvent(hCommandList, hEvent, 42) and zeEventHostSynchronizeIfBeyond(hEvent, std::numeric_limits<uint64_t>::max(), 42)

Also, it could help upper layer software to track command queue progress, and almost eliminates the chance to reset an event, etc.

[jandres742]

current status: We are working on an experimental extension in the driver (https://github.com/intel/compute-runtime) where instead of waiting on a binary state of an event, we wait on a value. We are ironing out some details and then we will have in the driver, for gather feedback on the feature.

[jandres742]

Experimental extension available in
https://github.com/intel/compute-runtime/blob/master/level_zero/doc/experimental_extensions/WAIT_AND_WRITE_ON_MEMORY.md

[wdamon-intel]

Moving to Spec Proposals to allow time for discussion.