1 files changed, 43 insertions, 0 deletions
diff --git a/library/std/src/sys/thread/unsupported.rs b/library/std/src/sys/thread/unsupported.rs
new file mode 100644
index 00000000000..a5001efa3b4
--- /dev/null
+++ b/library/std/src/sys/thread/unsupported.rs
@@ -0,0 +1,43 @@
+use crate::ffi::CStr;
+use crate::io;
+use crate::num::NonZero;
+use crate::time::Duration;
+
+pub struct Thread(!);
+
+pub const DEFAULT_MIN_STACK_SIZE: usize = 64 * 1024;
+
+impl Thread {
+    // unsafe: see thread::Builder::spawn_unchecked for safety requirements
+    pub unsafe fn new(
+        _stack: usize,
+        _name: Option<&str>,
+        _p: Box<dyn FnOnce()>,
+    ) -> io::Result<Thread> {
+        Err(io::Error::UNSUPPORTED_PLATFORM)
+    }
+
+    pub fn join(self) {
+        self.0
+    }
+}
+
+pub fn available_parallelism() -> io::Result<NonZero<usize>> {
+    Err(io::Error::UNKNOWN_THREAD_COUNT)
+}
+
+pub fn current_os_id() -> Option<u64> {
+    None
+}
+
+pub fn yield_now() {
+    // do nothing
+}
+
+pub fn set_name(_name: &CStr) {
+    // nope
+}
+
+pub fn sleep(_dur: Duration) {
+    panic!("can't sleep");
+}