target_family="wasm"and target feature
Corresponding intrinsic to wasm’s
This function, when called, will block the current thread if the memory
pointed to by
ptr is equal to
expression (performing this action
timeout_ns is a maximum number of nanoseconds the calling
thread will be blocked for, if it blocks. If the timeout is negative then
the calling thread will be blocked forever.
The calling thread can only be woken up with a call to the
once it has been blocked. Changing the memory behind
ptr will not wake
the thread once it’s blocked.
- 0 - indicates that the thread blocked and then was woken up
- 1 - the loaded value from
expression, the thread didn’t block
- 2 - the thread blocked, but the timeout expired.