opcode: add Futex{Wake,Wait,Waitv}

tokio-rs / io-uring

The `io_uring` library for Rust

Apache License 2.0

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opcode: add Futex{Wake,Wait,Waitv} #272

Closed oxalica closed 5 months ago

oxalica commented 5 months ago

These opcodes are available since Linux 6.7, and are mentioned by #253. FutexWaitV expects a new struct futex_waitv which is available in linux-raw-sys. An opaque type is added to the main crate to avoid polling in the dependency.

See:

IORING_OP_FUTEX_{WAIT,WAKE}: https://github.com/torvalds/linux/commit/194bb58c6090e39bd7d9b9c888a079213628e1f6
IORING_OP_FUTEX_WAITV: https://github.com/torvalds/linux/commit/8f350194d5cfd7016d4cd44e433df0faa4d4a703

oxalica commented 5 months ago

Exposed types::FutexWaitV and also fixed a typo in tests (waitv, not wakev).

I noticed that io-uring-test fails test_udp_recvmsg_multishot_trunc on my machine (io-uring-test/src/tests/net.rs:1549:25, assertion failed: msg.is_payload_truncated()), not sure if it's something kernel related (I'm on 6.9.0-rc2). But at least it seems unrelated.

quininer commented 5 months ago

Thank you!