Rollup merge of #122386 - joboet:move_pal_once, r=jhpratt

Move `Once` implementations to `sys`

Part of https://github.com/rust-lang/rust/issues/117276.

.reuse/dep5

@@ -52,7 +52,7 @@ Copyright: 2019 The Crossbeam Project Developers
            The Rust Project Developers (see https://thanks.rust-lang.org)
 License: MIT OR Apache-2.0
 
-Files: library/std/src/sys/locks/mutex/fuchsia.rs
+Files: library/std/src/sys/sync/mutex/fuchsia.rs
 Copyright: 2016 The Fuchsia Authors
            The Rust Project Developers (see https://thanks.rust-lang.org)
 License: BSD-2-Clause AND (MIT OR Apache-2.0)

library/std/src/sync/condvar.rs

@@ -3,7 +3,7 @@
 
 use crate::fmt;
 use crate::sync::{mutex, poison, LockResult, MutexGuard, PoisonError};
-use crate::sys::locks as sys;
+use crate::sys::sync as sys;
 use crate::time::{Duration, Instant};
 
 /// A type indicating whether a timed wait on a condition variable returned

library/std/src/sync/mutex.rs

@@ -8,7 +8,7 @@
 use crate::ops::{Deref, DerefMut};
 use crate::ptr::NonNull;
 use crate::sync::{poison, LockResult, TryLockError, TryLockResult};
-use crate::sys::locks as sys;
+use crate::sys::sync as sys;
 
 /// A mutual exclusion primitive useful for protecting shared data
 ///

library/std/src/sync/once.rs

@@ -8,7 +8,7 @@
 
 use crate::fmt;
 use crate::panic::{RefUnwindSafe, UnwindSafe};
-use crate::sys_common::once as sys;
+use crate::sys::sync as sys;
 
 /// A synchronization primitive which can be used to run a one-time global
 /// initialization. Useful for one-time initialization for FFI or related

library/std/src/sync/reentrant_lock.rs

@@ -6,7 +6,7 @@
 use crate::ops::Deref;
 use crate::panic::{RefUnwindSafe, UnwindSafe};
 use crate::sync::atomic::{AtomicUsize, Ordering::Relaxed};
-use crate::sys::locks as sys;
+use crate::sys::sync as sys;
 
 /// A re-entrant mutual exclusion lock
 ///

library/std/src/sync/rwlock.rs

@@ -8,7 +8,7 @@
 use crate::ops::{Deref, DerefMut};
 use crate::ptr::NonNull;
 use crate::sync::{poison, LockResult, TryLockError, TryLockResult};
-use crate::sys::locks as sys;
+use crate::sys::sync as sys;
 
 /// A reader-writer lock
 ///

library/std/src/sys/mod.rs

@@ -6,9 +6,9 @@
 mod personality;
 
 pub mod cmath;
-pub mod locks;
 pub mod os_str;
 pub mod path;
+pub mod sync;
 #[allow(dead_code)]
 #[allow(unused_imports)]
 pub mod thread_local;

library/std/src/sys/pal/teeos/mod.rs

@@ -19,8 +19,6 @@
 #[path = "../unsupported/io.rs"]
 pub mod io;
 pub mod net;
-#[path = "../unsupported/once.rs"]
-pub mod once;
 pub mod os;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;

library/std/src/sys/pal/uefi/mod.rs

@@ -21,8 +21,6 @@
 pub mod io;
 #[path = "../unsupported/net.rs"]
 pub mod net;
-#[path = "../unsupported/once.rs"]
-pub mod once;
 pub mod os;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;

library/std/src/sys/pal/unsupported/mod.rs

@@ -6,7 +6,6 @@
 pub mod fs;
 pub mod io;
 pub mod net;
-pub mod once;
 pub mod os;
 pub mod pipe;
 pub mod process;

library/std/src/sys/pal/wasi/mod.rs

@@ -41,8 +41,6 @@
 
 cfg_if::cfg_if! {
     if #[cfg(not(target_feature = "atomics"))] {
-        #[path = "../unsupported/once.rs"]
-        pub mod once;
         #[path = "../unsupported/thread_parking.rs"]
         pub mod thread_parking;
     }

library/std/src/sys/pal/wasip2/mod.rs

@@ -51,10 +51,6 @@
     if #[cfg(target_feature = "atomics")] {
         compile_error!("The wasm32-wasip2 target does not support atomics");
     } else {
-        #[path = "../unsupported/locks/mod.rs"]
-        pub mod locks;
-        #[path = "../unsupported/once.rs"]
-        pub mod once;
         #[path = "../unsupported/thread_parking.rs"]
         pub mod thread_parking;
     }

library/std/src/sys/pal/wasm/mod.rs

@@ -48,8 +48,6 @@
         #[path = "atomics/thread.rs"]
         pub mod thread;
     } else {
-        #[path = "../unsupported/once.rs"]
-        pub mod once;
         #[path = "../unsupported/thread.rs"]
         pub mod thread;
         #[path = "../unsupported/thread_parking.rs"]

library/std/src/sys/pal/zkvm/mod.rs

@@ -21,8 +21,6 @@
 pub mod io;
 #[path = "../unsupported/net.rs"]
 pub mod net;
-#[path = "../unsupported/once.rs"]
-pub mod once;
 pub mod os;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;

library/std/src/sys/sync/condvar/futex.rs

@@ -1,6 +1,6 @@
 use crate::sync::atomic::{AtomicU32, Ordering::Relaxed};
 use crate::sys::futex::{futex_wait, futex_wake, futex_wake_all};
-use crate::sys::locks::Mutex;
+use crate::sys::sync::Mutex;
 use crate::time::Duration;
 
 pub struct Condvar {

library/std/src/sys/sync/condvar/itron.rs

@@ -2,7 +2,7 @@
 use crate::sys::pal::itron::{
     abi, error::expect_success_aborting, spin::SpinMutex, task, time::with_tmos_strong,
 };
-use crate::{mem::replace, ptr::NonNull, sys::locks::Mutex, time::Duration};
+use crate::{mem::replace, ptr::NonNull, sys::sync::Mutex, time::Duration};
 
 // The implementation is inspired by the queue-based implementation shown in
 // Andrew D. Birrell's paper "Implementing Condition Variables with Semaphores"

library/std/src/sys/sync/condvar/no_threads.rs

@@ -1,4 +1,4 @@
-use crate::sys::locks::Mutex;
+use crate::sys::sync::Mutex;
 use crate::time::Duration;
 
 pub struct Condvar {}

library/std/src/sys/sync/condvar/pthread.rs

@@ -1,7 +1,7 @@
 use crate::cell::UnsafeCell;
 use crate::ptr;
 use crate::sync::atomic::{AtomicPtr, Ordering::Relaxed};
-use crate::sys::locks::{mutex, Mutex};
+use crate::sys::sync::{mutex, Mutex};
 #[cfg(not(target_os = "nto"))]
 use crate::sys::time::TIMESPEC_MAX;
 #[cfg(target_os = "nto")]

library/std/src/sys/sync/condvar/sgx.rs

@@ -1,5 +1,5 @@
-use crate::sys::locks::Mutex;
 use crate::sys::pal::waitqueue::{SpinMutex, WaitQueue, WaitVariable};
+use crate::sys::sync::Mutex;
 use crate::sys_common::lazy_box::{LazyBox, LazyInit};
 use crate::time::Duration;
 

library/std/src/sys/sync/condvar/teeos.rs

@@ -1,7 +1,7 @@
 use crate::cell::UnsafeCell;
 use crate::ptr;
 use crate::sync::atomic::{AtomicPtr, Ordering::Relaxed};
-use crate::sys::locks::mutex::{self, Mutex};
+use crate::sys::sync::mutex::{self, Mutex};
 use crate::sys::time::TIMESPEC_MAX;
 use crate::sys_common::lazy_box::{LazyBox, LazyInit};
 use crate::time::Duration;

library/std/src/sys/sync/condvar/windows7.rs

@@ -1,7 +1,7 @@
 use crate::cell::UnsafeCell;
 use crate::sys::c;
-use crate::sys::locks::{mutex, Mutex};
 use crate::sys::os;
+use crate::sys::sync::{mutex, Mutex};
 use crate::time::Duration;
 
 pub struct Condvar {

library/std/src/sys/sync/condvar/xous.rs

@@ -1,6 +1,6 @@
 use crate::os::xous::ffi::{blocking_scalar, scalar};
 use crate::os::xous::services::{ticktimer_server, TicktimerScalar};
-use crate::sys::locks::Mutex;
+use crate::sys::sync::Mutex;
 use crate::time::Duration;
 use core::sync::atomic::{AtomicUsize, Ordering};
 

library/std/src/sys/sync/mod.rs

@@ -1,7 +1,9 @@
 mod condvar;
 mod mutex;
+mod once;
 mod rwlock;
 
 pub use condvar::Condvar;
 pub use mutex::Mutex;
+pub use once::{Once, OnceState};
 pub use rwlock::RwLock;

library/std/src/sys/sync/once/mod.rs

@@ -30,6 +30,7 @@
         mod queue;
         pub use queue::{Once, OnceState};
     } else {
-        pub use crate::sys::once::{Once, OnceState};
+        mod no_threads;
+        pub use no_threads::{Once, OnceState};
     }
 }

library/std/src/sys/sync/rwlock/teeos.rs

@@ -1,4 +1,4 @@
-use crate::sys::locks::mutex::Mutex;
+use crate::sys::sync::mutex::Mutex;
 
 /// we do not supported rwlock, so use mutex to simulate rwlock.
 /// it's useful because so many code in std will use rwlock.

library/std/src/sys_common/mod.rs

@@ -24,7 +24,6 @@
 pub mod fs;
 pub mod io;
 pub mod lazy_box;
-pub mod once;
 pub mod process;
 pub mod thread;
 pub mod thread_info;

tests/debuginfo/mutex.rs

@@ -10,7 +10,7 @@
 //
 // cdb-command:dx m,d
 // cdb-check:m,d              [Type: std::sync::mutex::Mutex<i32>]
-// cdb-check:    [...] inner            [Type: std::sys::locks::mutex::futex::Mutex]
+// cdb-check:    [...] inner            [Type: std::sys::sync::mutex::futex::Mutex]
 // cdb-check:    [...] poison           [Type: std::sync::poison::Flag]
 // cdb-check:    [...] data             : 0 [Type: core::cell::UnsafeCell<i32>]
 

tests/debuginfo/rwlock-read.rs

@@ -16,7 +16,7 @@
 // cdb-command:dx r
 // cdb-check:r                [Type: std::sync::rwlock::RwLockReadGuard<i32>]
 // cdb-check:    [...] data             : NonNull([...]: 0) [Type: core::ptr::non_null::NonNull<i32>]
-// cdb-check:    [...] inner_lock       : [...] [Type: std::sys::locks::rwlock::futex::RwLock *]
+// cdb-check:    [...] inner_lock       : [...] [Type: std::sys::sync::rwlock::futex::RwLock *]
 
 #[allow(unused_variables)]