Move linux-specific futex code into `sys` module.

library/std/src/sys/unix/futex.rs

@@ -0,0 +1,38 @@
+#![cfg(any(target_os = "linux", target_os = "android"))]
+
+use crate::sync::atomic::AtomicI32;
+use crate::time::Duration;
+
+pub fn futex_wait(futex: &AtomicI32, expected: i32, timeout: Option<Duration>) {
+    let timespec;
+    let timespec_ptr = match timeout {
+        Some(timeout) => {
+            timespec = libc::timespec {
+                tv_sec: timeout.as_secs() as _,
+                tv_nsec: timeout.subsec_nanos() as _,
+            };
+            &timespec as *const libc::timespec
+        }
+        None => crate::ptr::null(),
+    };
+    unsafe {
+        libc::syscall(
+            libc::SYS_futex,
+            futex as *const AtomicI32,
+            libc::FUTEX_WAIT | libc::FUTEX_PRIVATE_FLAG,
+            expected,
+            timespec_ptr,
+        );
+    }
+}
+
+pub fn futex_wake(futex: &AtomicI32) {
+    unsafe {
+        libc::syscall(
+            libc::SYS_futex,
+            futex as *const AtomicI32,
+            libc::FUTEX_WAKE | libc::FUTEX_PRIVATE_FLAG,
+            1,
+        );
+    }
+}

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

@@ -49,6 +49,7 @@ pub mod env;
 pub mod ext;
 pub mod fd;
 pub mod fs;
+pub mod futex;
 pub mod io;
 #[cfg(target_os = "l4re")]
 mod l4re;

library/std/src/thread/parker/futex.rs

@@ -1,5 +1,6 @@
 use crate::sync::atomic::AtomicI32;
 use crate::sync::atomic::Ordering::{Acquire, Release};
+use crate::sys::futex::{futex_wait, futex_wake};
 use crate::time::Duration;
 
 const PARKED: i32 = -1;
@@ -70,37 +71,3 @@ impl Parker {
         }
     }
 }
-
-fn futex_wait(futex: &AtomicI32, expected: i32, timeout: Option<Duration>) {
-    let timespec;
-    let timespec_ptr = match timeout {
-        Some(timeout) => {
-            timespec = libc::timespec {
-                tv_sec: timeout.as_secs() as _,
-                tv_nsec: timeout.subsec_nanos() as _,
-            };
-            &timespec as *const libc::timespec
-        }
-        None => crate::ptr::null(),
-    };
-    unsafe {
-        libc::syscall(
-            libc::SYS_futex,
-            futex as *const AtomicI32,
-            libc::FUTEX_WAIT | libc::FUTEX_PRIVATE_FLAG,
-            expected,
-            timespec_ptr,
-        );
-    }
-}
-
-fn futex_wake(futex: &AtomicI32) {
-    unsafe {
-        libc::syscall(
-            libc::SYS_futex,
-            futex as *const AtomicI32,
-            libc::FUTEX_WAKE | libc::FUTEX_PRIVATE_FLAG,
-            1,
-        );
-    }
-}

library/std/src/thread/parker/mod.rs

@@ -1,7 +1,7 @@
 cfg_if::cfg_if! {
     if #[cfg(any(target_os = "linux", target_os = "android"))] {
-        mod linux;
-        pub use linux::Parker;
+        mod futex;
+        pub use futex::Parker;
     } else {
         mod generic;
         pub use generic::Parker;