Rollup merge of #104402 - joboet:sync_remutex, r=m-ou-se

Move `ReentrantMutex` to `std::sync`

If I understand #84187 correctly, `sys_common` should not contain platform-independent code, even if it is private.

library/std/src/io/stdio.rs

@@ -10,9 +10,8 @@
 use crate::fs::File;
 use crate::io::{self, BufReader, IoSlice, IoSliceMut, LineWriter, Lines};
 use crate::sync::atomic::{AtomicBool, Ordering};
-use crate::sync::{Arc, Mutex, MutexGuard, OnceLock};
+use crate::sync::{Arc, Mutex, MutexGuard, OnceLock, ReentrantMutex, ReentrantMutexGuard};
 use crate::sys::stdio;
-use crate::sys_common::remutex::{ReentrantMutex, ReentrantMutexGuard};
 
 type LocalStream = Arc<Mutex<Vec<u8>>>;
 

library/std/src/sync/mod.rs

@@ -177,6 +177,8 @@
 #[unstable(feature = "once_cell", issue = "74465")]
 pub use self::once_lock::OnceLock;
 
+pub(crate) use self::remutex::{ReentrantMutex, ReentrantMutexGuard};
+
 pub mod mpsc;
 
 mod barrier;
@@ -187,4 +189,5 @@
 mod once;
 mod once_lock;
 mod poison;
+mod remutex;
 mod rwlock;

library/std/src/sync/remutex/tests.rs

@@ -1,6 +1,6 @@
+use super::{ReentrantMutex, ReentrantMutexGuard};
 use crate::cell::RefCell;
 use crate::sync::Arc;
-use crate::sys_common::remutex::{ReentrantMutex, ReentrantMutexGuard};
 use crate::thread;
 
 #[test]

library/std/src/sys_common/mod.rs

@@ -27,7 +27,6 @@
 pub mod memchr;
 pub mod once;
 pub mod process;
-pub mod remutex;
 pub mod thread;
 pub mod thread_info;
 pub mod thread_local_dtor;