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Move futex locks to sys_common #104329

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Move futex locks to sys_common #104329

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2 changes: 1 addition & 1 deletion library/std/src/sync/condvar.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@ mod tests;

use crate::fmt;
use crate::sync::{mutex, poison, LockResult, MutexGuard, PoisonError};
use crate::sys::locks as sys;
use crate::sys_common::locks as sys;
use crate::time::{Duration, Instant};

/// A type indicating whether a timed wait on a condition variable returned
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2 changes: 1 addition & 1 deletion library/std/src/sync/mutex.rs
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Expand Up @@ -5,7 +5,7 @@ use crate::cell::UnsafeCell;
use crate::fmt;
use crate::ops::{Deref, DerefMut};
use crate::sync::{poison, LockResult, TryLockError, TryLockResult};
use crate::sys::locks as sys;
use crate::sys_common::locks as sys;

/// A mutual exclusion primitive useful for protecting shared data
///
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2 changes: 1 addition & 1 deletion library/std/src/sync/rwlock.rs
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Expand Up @@ -6,7 +6,7 @@ use crate::fmt;
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_common::locks as sys;

/// A reader-writer lock
///
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10 changes: 0 additions & 10 deletions library/std/src/sys/hermit/mod.rs
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Expand Up @@ -46,16 +46,6 @@ pub mod thread_local_dtor;
pub mod thread_local_key;
pub mod time;

#[path = "../unix/locks"]
pub mod locks {
mod futex_condvar;
mod futex_mutex;
mod futex_rwlock;
pub(crate) use futex_condvar::Condvar;
pub(crate) use futex_mutex::Mutex;
pub(crate) use futex_rwlock::RwLock;
}

use crate::io::ErrorKind;

#[allow(unused_extern_crates)]
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29 changes: 10 additions & 19 deletions library/std/src/sys/unix/locks/mod.rs
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@@ -1,25 +1,16 @@
#![cfg(not(any(
target_os = "linux",
target_os = "android",
all(target_os = "emscripten", target_feature = "atomics"),
target_os = "freebsd",
target_os = "openbsd",
target_os = "dragonfly",
)))]

cfg_if::cfg_if! {
if #[cfg(any(
target_os = "linux",
target_os = "android",
all(target_os = "emscripten", target_feature = "atomics"),
target_os = "freebsd",
target_os = "openbsd",
target_os = "dragonfly",
))] {
mod futex_mutex;
mod futex_rwlock;
mod futex_condvar;
pub(crate) use futex_mutex::Mutex;
pub(crate) use futex_rwlock::RwLock;
pub(crate) use futex_condvar::Condvar;
} else if #[cfg(target_os = "fuchsia")] {
if #[cfg(target_os = "fuchsia")] {
mod fuchsia_mutex;
mod futex_rwlock;
mod futex_condvar;
pub(crate) use fuchsia_mutex::Mutex;
pub(crate) use futex_rwlock::RwLock;
pub(crate) use futex_condvar::Condvar;
} else {
mod pthread_mutex;
mod pthread_rwlock;
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10 changes: 0 additions & 10 deletions library/std/src/sys/wasm/mod.rs
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Expand Up @@ -49,16 +49,6 @@ pub mod time;

cfg_if::cfg_if! {
if #[cfg(target_feature = "atomics")] {
#[path = "../unix/locks"]
pub mod locks {
#![allow(unsafe_op_in_unsafe_fn)]
mod futex_condvar;
mod futex_mutex;
mod futex_rwlock;
pub(crate) use futex_condvar::Condvar;
pub(crate) use futex_mutex::Mutex;
pub(crate) use futex_rwlock::RwLock;
}
#[path = "atomics/futex.rs"]
pub mod futex;
#[path = "atomics/thread.rs"]
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0 ...y/std/src/sys/unix/locks/futex_condvar.rs → ...std/src/sys_common/locks/futex_condvar.rs
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0 ...ary/std/src/sys/unix/locks/futex_mutex.rs → ...y/std/src/sys_common/locks/futex_mutex.rs
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0 ...ry/std/src/sys/unix/locks/futex_rwlock.rs → .../std/src/sys_common/locks/futex_rwlock.rs
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27 changes: 27 additions & 0 deletions library/std/src/sys_common/locks/mod.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
cfg_if::cfg_if! {
if #[cfg(any(
target_os = "android",
target_os = "dragonfly",
all(target_os = "emscripten", target_feature = "atomics"),
target_os = "freebsd",
target_os = "hermit",
target_os = "linux",
target_os = "openbsd",
all(any(target_arch = "wasm32", target_arch = "wasm64"), target_feature = "atomics"),
))] {
mod futex_mutex;
mod futex_rwlock;
mod futex_condvar;
pub(crate) use futex_mutex::Mutex;
pub(crate) use futex_rwlock::RwLock;
pub(crate) use futex_condvar::Condvar;
} else if #[cfg(target_os = "fuchsia")] {
mod futex_rwlock;
mod futex_condvar;
pub(crate) use crate::sys::locks::Mutex;
pub(crate) use futex_rwlock::RwLock;
pub(crate) use futex_condvar::Condvar;
} else {
pub(crate) use crate::sys::locks::{Mutex, RwLock, Condvar};
}
}
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This probably isn't the right place either because sys_common shouldn't contain platform cfg() stuff even though tidy currently doesn't complain about it either.

I was going to suggest moving it to sys::common instead but its mod.rs does say

rust/library/std/src/sys/common/mod.rs

Lines 1 to 5 in cd12888

// This module contains code that is shared between all platforms, mostly utility or fallback code.
// This explicitly does not include code that is shared between only a few platforms,
// such as when reusing an implementation from `unix` or `unsupported`.
// In those cases the desired code should be included directly using the #[path] attribute,
// not moved to this module.

So the #[path] seems to be the approved way already.

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Since this concerns other code like the thread parker and one-time initialization as well, I suggest we discuss this in #84187 (the tracking issue for that guideline).

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@workingjubilee workingjubilee Mar 6, 2023 •
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I don't want to devalue the contributions of anyone who has worked on libstd, but this mostly seems like it was one person's idea 2 years ago about what would be a good organization of stuff, tbh. Since then we've sprouted a lot more small niche mostly-tier-3 targets that are mostly just repeats of Linux or other POSIX platforms, yet with enough annoying variations that they induce quite a lot of configuration around that. I think we should revisit those guidelines heavily.

1 change: 1 addition & 0 deletions library/std/src/sys_common/mod.rs
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Expand Up @@ -24,6 +24,7 @@ pub mod backtrace;
pub mod fs;
pub mod io;
pub mod lazy_box;
pub mod locks;
pub mod memchr;
pub mod once;
pub mod process;
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2 changes: 1 addition & 1 deletion library/std/src/sys_common/remutex.rs
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Expand Up @@ -5,7 +5,7 @@ use crate::cell::UnsafeCell;
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_common::locks as sys;

/// A re-entrant mutual exclusion
///
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