std: replace `LazyBox` with `OnceBox`

This PR replaces the `LazyBox` wrapper used to allocate the pthread primitives with `OnceBox`, which has a more familiar API mirroring that of `OnceLock`. This cleans up the code in preparation for larger changes like #128184 (from which this PR was split) and allows some neat optimizations, like avoid an acquire-load of the allocation pointer in `Mutex::unlock`, where the initialization of the allocation must have already been observed.

Additionally, I've gotten rid of the TEEOS `Condvar` code, it's just a duplicate of the pthread one anyway and I didn't want to repeat myself.

1 files changed, 1 insertions, 1 deletions

diff --git a/library/std/src/sys/sync/mutex/mod.rs b/library/std/src/sys/sync/mutex/mod.rs
index 73d9bd273de..360df3fc4b5 100644
--- a/library/std/src/sys/sync/mutex/mod.rs
+++ b/library/std/src/sys/sync/mutex/mod.rs
@@ -19,7 +19,7 @@ cfg_if::cfg_if! {
         target_os = "teeos",
     ))] {
         mod pthread;
-        pub use pthread::{Mutex, raw};
+        pub use pthread::Mutex;
     } else if #[cfg(all(target_os = "windows", target_vendor = "win7"))] {
         mod windows7;
         pub use windows7::{Mutex, raw};