Rollup merge of #77619 - fusion-engineering-forks:wasm-parker, r=dtolnay

Use futex-based thread-parker for Wasm32.

This uses the existing `sys_common/thread_parker/futex.rs` futex-based thread parker (that was already used for Linux) for wasm32 as well (if the wasm32 atomics target feature is enabled, which is not the case by default).

Wasm32 provides the basic futex operations as instructions: https://webassembly.github.io/threads/syntax/instructions.html

These are now exposed from `sys::futex::{futex_wait, futex_wake}`, just like on Linux. So, `thread_parker/futex.rs` stays completely unmodified.

library/std/src/sys/wasm/futex_atomics.rs

@@ -0,0 +1,17 @@
+use crate::arch::wasm32;
+use crate::convert::TryInto;
+use crate::sync::atomic::AtomicI32;
+use crate::time::Duration;
+
+pub fn futex_wait(futex: &AtomicI32, expected: i32, timeout: Option<Duration>) {
+    let timeout = timeout.and_then(|t| t.as_nanos().try_into().ok()).unwrap_or(-1);
+    unsafe {
+        wasm32::memory_atomic_wait32(futex as *const AtomicI32 as *mut i32, expected, timeout);
+    }
+}
+
+pub fn futex_wake(futex: &AtomicI32) {
+    unsafe {
+        wasm32::memory_atomic_notify(futex as *const AtomicI32 as *mut i32, 1);
+    }
+}

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

@@ -55,6 +55,8 @@
         pub mod mutex;
         #[path = "rwlock_atomics.rs"]
         pub mod rwlock;
+        #[path = "futex_atomics.rs"]
+        pub mod futex;
     } else {
         #[path = "../unsupported/condvar.rs"]
         pub mod condvar;

library/std/src/sys_common/thread_parker/mod.rs

@@ -1,5 +1,9 @@
 cfg_if::cfg_if! {
-    if #[cfg(any(target_os = "linux", target_os = "android"))] {
+    if #[cfg(any(
+        target_os = "linux",
+        target_os = "android",
+        all(target_arch = "wasm32", target_feature = "atomics"),
+    ))] {
         mod futex;
         pub use futex::Parker;
     } else {