6 Commits

Author	SHA1	Message	Date
Eric Seppanen	fe79082e29	require documentation in seqwait.rs	2021-04-23 15:01:22 -07:00
Eric Seppanen	8beaf76c85	SeqWait: don't do wakeups under the lock ... Clippy pointed out that `drop(waiters)` didn't do anything, because there was a misplaced ";" causing `waiters` to be a unit type `()`. This change makes it do what was intended: the lock should be dropped first, then the wakeups should be processed.	2021-04-23 14:16:34 -07:00
Konstantin Knizhnik	9e7c45cb72	Merge with master	2021-04-22 09:45:13 +03:00
Eric Seppanen	8060e17b50	add SeqWait ... SeqWait adds a way to .await the arrival of some sequence number. It provides wait_for(num) which is an async fn, and advance(num) which is synchronous. This should be useful in solving the page cache deadlocks, and may be useful in other areas too. This implementation still uses a Mutex internally, but only for a brief critical section. If we find this code broadly useful and start to care more about executor stalls due to unfair thread scheduling, there might be ways to make it lock-free.	2021-04-21 18:02:13 -07:00
Eric Seppanen	92e4f4b3b6	cargo fmt	2021-04-20 17:59:56 -07:00
Eric Seppanen	f387769203	add zenith_utils crate ... This is a place for code that's shared between other crates in this repository.	2021-04-20 11:11:29 -07:00