Duncan Coutts authored Jan 09, 2023 and Marge Bot committed Apr 03, 2024

rather than directly operating on the IO manager's data structures.

Specifically, when thowing an async exception to a thread that is
blocked waiting for I/O or waiting for a timer, then we want to cancel
that I/O waiting or cancel the timer. Currently this is done directly in
removeFromQueues() in RaiseAsync.c. We want it to go via proper APIs
both for modularity but also to let us support multiple I/O managers.

So add sync{IO,Delay}Cancel, which is the cancellation for the
corresponding sync{IO,Delay}. The implementations of these use the usual
"switch (iomgr_type)" style.