Fix @Uninterruptible on VMThreads.lockThreadMutexInNativeCode().

Author: christianhaeubl

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/thread/VMThreads.java

@@ -24,11 +24,6 @@
  */
 package com.oracle.svm.core.thread;
 
-import com.oracle.svm.core.locks.VMLockSupport;
-import jdk.graal.compiler.api.directives.GraalDirectives;
-import jdk.graal.compiler.api.replacements.Fold;
-import jdk.graal.compiler.replacements.ReplacementsUtil;
-import jdk.graal.compiler.replacements.nodes.AssertionNode;
 import org.graalvm.nativeimage.CurrentIsolate;
 import org.graalvm.nativeimage.ImageSingletons;
 import org.graalvm.nativeimage.Isolate;
@@ -55,6 +50,7 @@
 import com.oracle.svm.core.jdk.UninterruptibleUtils;
 import com.oracle.svm.core.jdk.UninterruptibleUtils.AtomicWord;
 import com.oracle.svm.core.locks.VMCondition;
+import com.oracle.svm.core.locks.VMLockSupport;
 import com.oracle.svm.core.locks.VMMutex;
 import com.oracle.svm.core.log.Log;
 import com.oracle.svm.core.nodes.CFunctionEpilogueNode;
@@ -68,6 +64,11 @@
 import com.oracle.svm.core.util.UnsignedUtils;
 import com.oracle.svm.core.util.VMError;
 
+import jdk.graal.compiler.api.directives.GraalDirectives;
+import jdk.graal.compiler.api.replacements.Fold;
+import jdk.graal.compiler.replacements.ReplacementsUtil;
+import jdk.graal.compiler.replacements.nodes.AssertionNode;
+
 /**
  * Utility methods for the manipulation and iteration of {@link IsolateThread}s.
  */
@@ -407,12 +408,12 @@ public static boolean wasStartedByCurrentIsolate(IsolateThread thread) {
         return StartedByCurrentIsolate.getAddress(thread).readByte(0) != 0;
     }
 
-    @Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true)
+    @Uninterruptible(reason = "Thread locks/holds the THREAD_MUTEX.", callerMustBe = true)
     static void lockThreadMutexInNativeCode() {
         lockThreadMutexInNativeCode(false);
     }
 
-    @Uninterruptible(reason = "Called from uninterruptible code.")
+    @Uninterruptible(reason = "Thread locks/holds the THREAD_MUTEX.", callerMustBe = true)
     @NeverInline("Must not be inlined in a caller that has an exception handler: We only support InvokeNode and not InvokeWithExceptionNode between a CFunctionPrologueNode and CFunctionEpilogueNode.")
     private static void lockThreadMutexInNativeCode(boolean unspecifiedOwner) {
         CFunctionPrologueNode.cFunctionPrologue(StatusSupport.STATUS_IN_NATIVE);