chore(napi): reduce Mutex usage while loading addon

crates/sys/src/functions.rs

@@ -738,7 +738,7 @@ pub use napi7::*;
 pub use napi8::*;
 
 #[cfg(windows)]
-pub(super) unsafe fn load() -> Result<(), libloading::Error> {
+pub(super) unsafe fn load() -> Result<libloading::Library, libloading::Error> {
   let host = match libloading::os::windows::Library::this() {
     Ok(lib) => lib.into(),
     Err(err) => {
@@ -764,5 +764,5 @@ pub(super) unsafe fn load() -> Result<(), libloading::Error> {
   napi8::load(&host)?;
   #[cfg(feature = "experimental")]
   experimental::load(&host)?;
-  Ok(())
+  Ok(host)
 }

crates/sys/src/lib.rs

@@ -77,28 +77,21 @@ macro_rules! generate {
   };
 }
 
-#[cfg(windows)]
-use std::sync::Once;
-
 mod functions;
 mod types;
 
 pub use functions::*;
 pub use types::*;
 
-#[cfg(windows)]
-static SETUP: Once = Once::new();
-
 /// Loads N-API symbols from host process.
 /// Must be called at least once before using any functions in bindings or
 /// they will panic.
 /// Safety: `env` must be a valid `napi_env` for the current thread
 #[cfg(windows)]
 #[allow(clippy::missing_safety_doc)]
-pub unsafe fn setup() {
-  SETUP.call_once(|| {
-    if let Err(err) = load() {
-      panic!("{}", err);
-    }
-  });
+pub unsafe fn setup() -> libloading::Library {
+  match load() {
+    Err(err) => panic!("{}", err),
+    Ok(l) => l,
+  }
 }