src: define NAPI_HAS_THREADS

PR-URL: #1283
Reviewed-By: Michael Dawson <midawson@redhat.com
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

Author: toyobayashi

napi-inl.h

@@ -12,7 +12,9 @@
 
 #include <algorithm>
 #include <cstring>
+#if NAPI_HAS_THREADS
 #include <mutex>
+#endif  // NAPI_HAS_THREADS
 #include <type_traits>
 #include <utility>
 
@@ -205,7 +207,7 @@ struct FinalizeData {
   Hint* hint;
 };
 
-#if (NAPI_VERSION > 3 && !defined(__wasm32__))
+#if (NAPI_VERSION > 3 && NAPI_HAS_THREADS)
 template <typename ContextType = void,
           typename Finalizer = std::function<void(Env, void*, ContextType*)>,
           typename FinalizerDataType = void>
@@ -299,7 +301,7 @@ napi_value DefaultCallbackWrapper(napi_env env, Napi::Function cb) {
   return cb;
 }
 #endif  // NAPI_VERSION > 4
-#endif  // NAPI_VERSION > 3 && !defined(__wasm32__)
+#endif  // NAPI_VERSION > 3 && NAPI_HAS_THREADS
 
 template <typename Getter, typename Setter>
 struct AccessorCallbackData {
@@ -4828,6 +4830,8 @@ inline Napi::Env AsyncContext::Env() const {
 // AsyncWorker class
 ////////////////////////////////////////////////////////////////////////////////
 
+#if NAPI_HAS_THREADS
+
 inline AsyncWorker::AsyncWorker(const Function& callback)
     : AsyncWorker(callback, "generic") {}
 
@@ -5006,7 +5010,9 @@ inline void AsyncWorker::OnWorkComplete(Napi::Env /*env*/, napi_status status) {
   }
 }
 
-#if (NAPI_VERSION > 3 && !defined(__wasm32__))
+#endif  // NAPI_HAS_THREADS
+
+#if (NAPI_VERSION > 3 && NAPI_HAS_THREADS)
 ////////////////////////////////////////////////////////////////////////////////
 // TypedThreadSafeFunction<ContextType,DataType,CallJs> class
 ////////////////////////////////////////////////////////////////////////////////
@@ -6255,7 +6261,7 @@ inline void AsyncProgressQueueWorker<T>::ExecutionProgress::Send(
     const T* data, size_t count) const {
   _worker->SendProgress_(data, count);
 }
-#endif  // NAPI_VERSION > 3 && !defined(__wasm32__)
+#endif  // NAPI_VERSION > 3 && NAPI_HAS_THREADS
 
 ////////////////////////////////////////////////////////////////////////////////
 // Memory Management class

napi.h

@@ -1,11 +1,22 @@
 #ifndef SRC_NAPI_H_
 #define SRC_NAPI_H_
 
+#ifndef NAPI_HAS_THREADS
+#if !defined(__wasm__) || (defined(__EMSCRIPTEN_PTHREADS__) ||                 \
+                           (defined(__wasi__) && defined(_REENTRANT)))
+#define NAPI_HAS_THREADS 1
+#else
+#define NAPI_HAS_THREADS 0
+#endif
+#endif
+
 #include <node_api.h>
 #include <functional>
 #include <initializer_list>
 #include <memory>
+#if NAPI_HAS_THREADS
 #include <mutex>
+#endif  // NAPI_HAS_THREADS
 #include <string>
 #include <vector>
 
@@ -2454,6 +2465,7 @@ class AsyncContext {
   napi_async_context _context;
 };
 
+#if NAPI_HAS_THREADS
 class AsyncWorker {
  public:
   virtual ~AsyncWorker();
@@ -2516,8 +2528,9 @@ class AsyncWorker {
   std::string _error;
   bool _suppress_destruct;
 };
+#endif  // NAPI_HAS_THREADS
 
-#if (NAPI_VERSION > 3 && !defined(__wasm32__))
+#if (NAPI_VERSION > 3 && NAPI_HAS_THREADS)
 class ThreadSafeFunction {
  public:
   // This API may only be called from the main thread.
@@ -3087,7 +3100,7 @@ class AsyncProgressQueueWorker
   void Signal() const;
   void SendProgress_(const T* data, size_t count);
 };
-#endif  // NAPI_VERSION > 3 && !defined(__wasm32__)
+#endif  // NAPI_VERSION > 3 && NAPI_HAS_THREADS
 
 // Memory management.
 class MemoryManagement {