Implement sys.is_finalizing

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/PythonLanguage.java

@@ -208,8 +208,7 @@ public NodeFactory getNodeFactory() {
 
     @Override
     protected void finalizeContext(PythonContext context) {
-        context.shutdownThreads();
-        context.runShutdownHooks();
+        context.finalizeContext();
         super.finalizeContext(context);
     }
 

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/SysModuleBuiltins.java

@@ -52,6 +52,7 @@
 import java.util.Date;
 import java.util.List;
 
+import com.oracle.truffle.api.dsl.CachedContext;
 import org.graalvm.nativeimage.ImageInfo;
 
 import com.oracle.graal.python.PythonLanguage;
@@ -492,4 +493,15 @@ protected LookupAndCallUnaryNode createWithoutError() {
             return LookupAndCallUnaryNode.create(__SIZEOF__);
         }
     }
+    
+    @Builtin(name = "is_finalizing")
+    @GenerateNodeFactory
+    public abstract static class IsFinalizingNode extends PythonBuiltinNode {
+        @Specialization
+        static boolean doGeneric(
+                @CachedContext(PythonLanguage.class) PythonContext context) {
+            return context.isFinalizing();
+        }
+    }
+
 }

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/PythonContext.java

@@ -107,6 +107,7 @@
 
 public final class PythonContext {
     private static final TruffleLogger LOGGER = PythonLanguage.getLogger(PythonContext.class);
+    private volatile boolean finalizing;
 
     private static final class PythonThreadState {
 
@@ -717,7 +718,14 @@ public void deregisterShutdownHook(Object callable) {
     }
 
     @TruffleBoundary
-    public void runShutdownHooks() {
+    public void finalizeContext() {
+        finalizing = true;
+        shutdownThreads();
+        runShutdownHooks();
+    }
+
+    @TruffleBoundary
+    private void runShutdownHooks() {
         handler.shutdown();
         // run atExitHooks in reverse order they were registered
         MapCursor<Object, AtExitHook> cursor = atExitHooks.getEntries();
@@ -741,7 +749,7 @@ public void runShutdownHooks() {
     }
 
     @TruffleBoundary
-    public void shutdownThreads() {
+    private void shutdownThreads() {
         LOGGER.fine("shutting down threads");
         PDict importedModules = getImportedModules();
         HashingStorage dictStorage = GetDictStorageNode.getUncached().execute(importedModules);
@@ -1105,4 +1113,8 @@ public void setGcEnabled(boolean flag) {
     public AsyncHandler.SharedFinalizer getSharedFinalizer() {
         return sharedFinalizer;
     }
+
+    public boolean isFinalizing() {
+        return finalizing;
+    }
 }