some fix for handling configuration change and recycling (#539)

Author: pan-wang

src/AspNetCore/Inc/globalmodule.h

@@ -28,8 +28,8 @@ class ASPNET_CORE_GLOBAL_MODULE : public CGlobalModule
     );
 
     GLOBAL_NOTIFICATION_STATUS
-    OnGlobalConfigurationChange(
-        _In_ IGlobalConfigurationChangeProvider * pProvider
+    OnGlobalApplicationStop(
+        _In_ IHttpApplicationStopProvider * pProvider
     );
 
 private:

src/AspNetCore/Src/applicationmanager.cxx

@@ -235,7 +235,14 @@ APPLICATION_MANAGER::ShutDown()
 
         // clean up the hash table so that the application will be informed on shutdown
         m_pApplicationInfoHash->Clear();
+
         ReleaseSRWLockExclusive(&m_srwLock);
     }
 
+    // stop filewatcher monitoring thread
+    if (m_pFileWatcher != NULL)
+    {
+        delete  m_pFileWatcher;
+        m_pFileWatcher = NULL;
+    }
 }

src/AspNetCore/Src/dllmain.cpp

@@ -201,8 +201,9 @@ HRESULT
     }
 
     hr = pModuleInfo->SetGlobalNotifications(
-                                   pGlobalModule,
-                                   GL_CONFIGURATION_CHANGE | GL_STOP_LISTENING);
+                              pGlobalModule,
+                              GL_APPLICATION_STOP | // Configuration change trigers IIS application stop
+                              GL_STOP_LISTENING);   // worker process stop or recycle
 
     if (FAILED(hr))
     {

src/AspNetCore/Src/globalmodule.cpp

@@ -34,14 +34,14 @@ ASPNET_CORE_GLOBAL_MODULE::OnGlobalStopListening(
 // Recycled the corresponding core app if its configuration changed
 //
 GLOBAL_NOTIFICATION_STATUS
-ASPNET_CORE_GLOBAL_MODULE::OnGlobalConfigurationChange(
-    _In_ IGlobalConfigurationChangeProvider * pProvider
+ASPNET_CORE_GLOBAL_MODULE::OnGlobalApplicationStop(
+    _In_ IHttpApplicationStopProvider * pProvider
 )
 {
-    UNREFERENCED_PARAMETER(pProvider);
-
     // Retrieve the path that has changed.
-    PCWSTR pwszChangePath = pProvider->GetChangePath();
+    IHttpApplication* pApplication = pProvider->GetApplication();
+
+    PCWSTR pwszChangePath = pApplication->GetAppConfigPath();
 
     // Test for an error.
     if (NULL != pwszChangePath &&