Add more from the std

crates/std/src/sys/sync/thread_parking/mod.rs

@@ -0,0 +1,49 @@
+cfg_select! {
+    any(
+        all(target_os = "windows", not(target_vendor = "win7")),
+        target_os = "linux",
+        target_os = "android",
+        all(target_arch = "wasm32", target_feature = "atomics"),
+        target_os = "freebsd",
+        target_os = "openbsd",
+        target_os = "dragonfly",
+        target_os = "fuchsia",
+        target_os = "motor",
+        target_os = "hermit",
+    ) => {
+        mod futex;
+        pub use futex::Parker;
+    }
+    any(
+        target_os = "netbsd",
+        all(target_vendor = "fortanix", target_env = "sgx"),
+        target_os = "solid_asp3",
+    ) => {
+        mod id;
+        pub use id::Parker;
+    }
+    target_vendor = "win7" => {
+        mod windows7;
+        pub use windows7::Parker;
+    }
+    all(target_vendor = "apple", not(miri)) => {
+        // Doesn't work in Miri, see <https://github.com/rust-lang/miri/issues/2589>.
+        mod darwin;
+        pub use darwin::Parker;
+    }
+    target_os = "xous" => {
+        mod xous;
+        pub use xous::Parker;
+    }
+    any(
+        target_family = "unix",
+        target_os = "teeos",
+    ) => {
+        mod pthread;
+        pub use pthread::Parker;
+    }
+    _ => {
+        mod unsupported;
+        pub use unsupported::Parker;
+    }
+}

crates/std/src/sys/sync/thread_parking/unsupported.rs

@@ -0,0 +1,11 @@
+use crate::pin::Pin;
+use crate::time::Duration;
+
+pub struct Parker {}
+
+impl Parker {
+    pub unsafe fn new_in_place(_parker: *mut Parker) {}
+    pub unsafe fn park(self: Pin<&Self>) {}
+    pub unsafe fn park_timeout(self: Pin<&Self>, _dur: Duration) {}
+    pub fn unpark(self: Pin<&Self>) {}
+}