vexos: move thread from sys::pal to sys::thread

Author: tropicaaal

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

@@ -2,9 +2,16 @@
 pub mod os;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;
-pub mod thread;
 pub mod time;
 
+#[expect(dead_code)]
+#[path = "../unsupported/common.rs"]
+mod unsupported_common;
+
+pub use unsupported_common::{
+    decode_error_kind, init, is_interrupted, unsupported, unsupported_err,
+};
+
 use crate::arch::global_asm;
 use crate::ptr;
 use crate::sys::stdio;
@@ -45,10 +52,6 @@ pub unsafe extern "C" fn _start() -> ! {
     abort_internal()
 }
 
-// SAFETY: must be called only once during runtime initialization.
-// NOTE: this is not guaranteed to run, for example when Rust code is called externally.
-pub unsafe fn init(_argc: isize, _argv: *const *const u8, _sigpipe: u8) {}
-
 // SAFETY: must be called only once during runtime cleanup.
 // NOTE: this is not guaranteed to run, for example when the program aborts.
 pub unsafe fn cleanup() {
@@ -66,22 +69,6 @@ pub unsafe fn cleanup() {
     }
 }
 
-pub fn unsupported<T>() -> crate::io::Result<T> {
-    Err(unsupported_err())
-}
-
-pub fn unsupported_err() -> crate::io::Error {
-    crate::io::Error::UNSUPPORTED_PLATFORM
-}
-
-pub fn is_interrupted(_code: i32) -> bool {
-    false
-}
-
-pub fn decode_error_kind(_code: i32) -> crate::io::ErrorKind {
-    crate::io::ErrorKind::Uncategorized
-}
-
 pub fn abort_internal() -> ! {
     unsafe {
         vex_sdk::vexSystemExitRequest();

library/std/src/sys/pal/vexos/thread.rs

@@ -81,6 +81,13 @@ cfg_select! {
         ))]
         pub use unsupported::set_name;
     }
+    target_os = "vexos" => {
+        mod vexos;
+        pub use vexos::{sleep, yield_now};
+        #[expect(dead_code)]
+        mod unsupported;
+        pub use unsupported::{Thread, available_parallelism, current_os_id, set_name, DEFAULT_MIN_STACK_SIZE};
+    }
     all(target_os = "wasi", target_env = "p1") => {
         mod wasip1;
         pub use wasip1::{DEFAULT_MIN_STACK_SIZE, sleep, yield_now};
@@ -138,6 +145,7 @@ cfg_select! {
     target_os = "dragonfly",
     target_os = "hurd",
     target_os = "fuchsia",
+    target_os = "vexos",
     target_os = "vxworks",
     all(target_os = "wasi", target_env = "p2"),
 )))]

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

@@ -0,0 +1,17 @@
+use crate::time::Duration;
+
+pub fn yield_now() {
+    unsafe {
+        vex_sdk::vexTasksRun();
+    }
+}
+
+pub fn sleep(dur: Duration) {
+    let start = Instant::now();
+
+    while start.elapsed() < dur {
+        unsafe {
+            vex_sdk::vexTasksRun();
+        }
+    }
+}