1 files changed, 5 insertions, 0 deletions
diff --git a/vendor/jobserver/src/wasm.rs b/vendor/jobserver/src/wasm.rs
index b88a9d952..3793bd67c 100644
--- a/vendor/jobserver/src/wasm.rs
+++ b/vendor/jobserver/src/wasm.rs
@@ -59,6 +59,11 @@ impl Client {
         );
     }
 
+    pub fn available(&self) -> io::Result<usize> {
+        let lock = self.inner.count.lock().unwrap_or_else(|e| e.into_inner());
+        Ok(*lock)
+    }
+
     pub fn configure(&self, _cmd: &mut Command) {
         unreachable!();
     }