how to let submit_and_wait to wait for a new entry

[Sherlock-Holo]

with concurrent IoUring, I create a thread and it will call submit_and_wait(1) to waiting for the entry, when it is waiting, I create another thread and push a new entry into sqe. but the thread one doesn't know a new entry is pushed.

How to let submit_and_wait know a new entry is pushed and return it when it ready? I've tried to call submit after push, it works with Readv and Writev, the submit_and_wait return after read or write complete, but Openat2 doesn't work, the submit_and_wait still blocking even the file is created.

Is there a better way to do this?

[quininer]

but Openat2 doesn't work, the submit_and_wait still blocking even the file is created.

I failed to reproduce this problem. can you share your code?

[Sherlock-Holo]

@quininer

open_options.rs: https://fars.ee/0plu/
lib.rs: https://fars.ee/JV4i/
ext.rs: https://fars.ee/Kguw/
Cargo.toml https://fars.ee/xXlP/

the tests::open run won't finish because ring.submit_and_wait(1).unwrap(); never return

other tests work well

my kernel is 5.6.10-arch1-1, it should support Openat2

[Sherlock-Holo]

run cargo test with --nocapture, the tests::open will print some log like

    Finished test [unoptimized + debuginfo] target(s) in 0.07s
     Running target/debug/deps/ring_io-100c7598fff98b7a

running 1 test
dir path "/tmp/.tmpLlv2mk"
file path "/tmp/.tmpLlv2mk/test"
start create file
pushed
submited

if submit_and_wait return, it should print log wait done and the test will be finished

[quininer]

You forgot to call init_ring in OpenFuture, which caused submit_and_wait not to be called at all.

[Sherlock-Holo]

oh.... thank you to point my mistake 🤣. after call it, the tests::open works well now, problem solved