Auto merge of #110211 - joboet:queue_lock, r=Amanieu

Replace pthread `RwLock` with custom implementation

This is one of the last items in #93740. I'm doing `RwLock` first because it is more self-contained and has less tradeoffs to make. The motivation is explained in the documentation, but in short: the pthread rwlock is slow and buggy and `std` can do much better. I considered implementing a parking lot, as was discussed in the tracking issue, but settled for the queue-based version because writing self-balancing binary trees is not fun in Rust...

This is a rather complex change, so I have added quite a bit of documentation to help explain it. Please point out any part that could be explained better.

~~The read performance is really good, I'm getting 4x the throughput of the pthread version and about the same performance as usync/parking_lot on an Apple M1 Max in the usync benchmark suite, but the write performance still falls way behind what usync and parking_lot achieve. I tried using a separate queue lock like what usync uses, but that didn't help. I'll try to investigate further in the future, but I wanted to get some eyes on this first.~~ [Resolved](https://github.com/rust-lang/rust/pull/110211#issuecomment-1513682336)

r? `@m-ou-se`
CC `@kprotty`

1 files changed, 2 insertions, 0 deletions

diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 571e475c336..cab3e399ffa 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -339,12 +339,14 @@
 #![feature(portable_simd)]
 #![feature(prelude_2024)]
 #![feature(ptr_as_uninit)]
+#![feature(ptr_mask)]
 #![feature(slice_internals)]
 #![feature(slice_ptr_get)]
 #![feature(slice_range)]
 #![feature(std_internals)]
 #![feature(str_internals)]
 #![feature(strict_provenance)]
+#![feature(strict_provenance_atomic_ptr)]
 // tidy-alphabetical-end
 //
 // Library features (alloc):