env: add watched_providers for AsyncListener

Now the second field in asyncFlags will tell if the provider is
currently being watched, or listened for.

Signed-off-by: Timothy J Fontaine <tjfontaine@gmail.com>

src/env-inl.h

@@ -126,6 +126,10 @@ inline bool Environment::AsyncListener::has_listener() const {
   return fields_[kHasListener] > 0;
 }
 
+inline uint32_t Environment::AsyncListener::watched_providers() const {
+  return fields_[kWatchedProviders];
+}
+
 inline Environment::DomainFlag::DomainFlag() {
   for (int i = 0; i < kFieldsCount; ++i) fields_[i] = 0;
 }
@@ -253,6 +257,11 @@ inline bool Environment::has_async_listener() const {
   return const_cast<Environment*>(this)->async_listener()->has_listener();
 }
 
+inline uint32_t Environment::watched_providers() const {
+  // The const_cast is okay, it doesn't violate conceptual const-ness.
+  return const_cast<Environment*>(this)->async_listener()->watched_providers();
+}
+
 inline bool Environment::in_domain() const {
   // The const_cast is okay, it doesn't violate conceptual const-ness.
   return using_domains() &&

src/env.h

@@ -191,6 +191,7 @@ class Environment {
     inline uint32_t* fields();
     inline int fields_count() const;
     inline bool has_listener() const;
+    inline uint32_t watched_providers() const;
 
    private:
     friend class Environment;  // So we can call the constructor.
@@ -198,6 +199,7 @@ class Environment {
 
     enum Fields {
       kHasListener,
+      kWatchedProviders,
       kFieldsCount
     };
 
@@ -272,6 +274,7 @@ class Environment {
   inline uv_loop_t* event_loop() const;
   inline bool has_async_listener() const;
   inline bool in_domain() const;
+  inline uint32_t watched_providers() const;
 
   static inline Environment* from_immediate_check_handle(uv_check_t* handle);
   inline uv_check_t* immediate_check_handle();

src/node.js

@@ -283,6 +283,7 @@
 
     // Needs to be the same as src/env.h
     var kHasListener = 0;
+    var kWatchedProviders = 1;
 
     // Flags to determine what async listeners are available.
     var HAS_CREATE_AL = 1 << 0;