8054494: Remove sun.misc.Unsafe.monitorEnter, monitorExit and tryMonitorEnter

Reviewed-by: dholmes, coleenp
Contributed-by: paul.sandoz@oracle.com, filipp.zhinkin@gmail.com

hotspot/src/share/vm/prims/unsafe.cpp

 /*
- * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -1104,43 +1104,6 @@ UNSAFE_END
 
 
 
-UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
-  UnsafeWrapper("Unsafe_MonitorEnter");
-  {
-    if (jobj == NULL) {
-      THROW(vmSymbols::java_lang_NullPointerException());
-    }
-    Handle obj(thread, JNIHandles::resolve_non_null(jobj));
-    ObjectSynchronizer::jni_enter(obj, CHECK);
-  }
-UNSAFE_END
-
-
-UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
-  UnsafeWrapper("Unsafe_TryMonitorEnter");
-  {
-    if (jobj == NULL) {
-      THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
-    }
-    Handle obj(thread, JNIHandles::resolve_non_null(jobj));
-    bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
-    return (res ? JNI_TRUE : JNI_FALSE);
-  }
-UNSAFE_END
-
-
-UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
-  UnsafeWrapper("Unsafe_MonitorExit");
-  {
-    if (jobj == NULL) {
-      THROW(vmSymbols::java_lang_NullPointerException());
-    }
-    Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
-    ObjectSynchronizer::jni_exit(obj(), CHECK);
-  }
-UNSAFE_END
-
-
 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
   UnsafeWrapper("Unsafe_ThrowException");
   {
@@ -1365,8 +1328,6 @@ static JNINativeMethod methods_140[] = {
     {CC"defineClass",        CC"("DC0_Args")"CLS,        FN_PTR(Unsafe_DefineClass0)},
     {CC"defineClass",        CC"("DC_Args")"CLS,         FN_PTR(Unsafe_DefineClass)},
     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
-    {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
-    {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)}
 };
 
@@ -1411,8 +1372,6 @@ static JNINativeMethod methods_141[] = {
     {CC"defineClass",        CC"("DC0_Args")"CLS,        FN_PTR(Unsafe_DefineClass0)},
     {CC"defineClass",        CC"("DC_Args")"CLS,         FN_PTR(Unsafe_DefineClass)},
     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
-    {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
-    {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)}
 
 };
@@ -1461,8 +1420,6 @@ static JNINativeMethod methods_15[] = {
     {CC"defineClass",        CC"("DC0_Args")"CLS,        FN_PTR(Unsafe_DefineClass0)},
     {CC"defineClass",        CC"("DC_Args")"CLS,         FN_PTR(Unsafe_DefineClass)},
     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
-    {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
-    {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)},
     {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z",  FN_PTR(Unsafe_CompareAndSwapObject)},
     {CC"compareAndSwapInt",  CC"("OBJ"J""I""I"")Z",      FN_PTR(Unsafe_CompareAndSwapInt)},
@@ -1515,9 +1472,6 @@ static JNINativeMethod methods_16[] = {
     {CC"defineClass",        CC"("DC0_Args")"CLS,        FN_PTR(Unsafe_DefineClass0)},
     {CC"defineClass",        CC"("DC_Args")"CLS,         FN_PTR(Unsafe_DefineClass)},
     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
-    {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
-    {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
-    {CC"tryMonitorEnter",    CC"("OBJ")Z",               FN_PTR(Unsafe_TryMonitorEnter)},
     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)},
     {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z",  FN_PTR(Unsafe_CompareAndSwapObject)},
     {CC"compareAndSwapInt",  CC"("OBJ"J""I""I"")Z",      FN_PTR(Unsafe_CompareAndSwapInt)},
@@ -1571,9 +1525,6 @@ static JNINativeMethod methods_18[] = {
 
     {CC"defineClass",        CC"("DC_Args")"CLS,         FN_PTR(Unsafe_DefineClass)},
     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
-    {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
-    {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
-    {CC"tryMonitorEnter",    CC"("OBJ")Z",               FN_PTR(Unsafe_TryMonitorEnter)},
     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)},
     {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z",  FN_PTR(Unsafe_CompareAndSwapObject)},
     {CC"compareAndSwapInt",  CC"("OBJ"J""I""I"")Z",      FN_PTR(Unsafe_CompareAndSwapInt)},

hotspot/src/share/vm/runtime/synchronizer.cpp

 /*
- * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -276,18 +276,6 @@ void ObjectSynchronizer::jni_enter(Handle obj, TRAPS) {
   THREAD->set_current_pending_monitor_is_from_java(true);
 }
 
-// NOTE: must use heavy weight monitor to handle jni monitor enter
-bool ObjectSynchronizer::jni_try_enter(Handle obj, Thread* THREAD) {
-  if (UseBiasedLocking) {
-    BiasedLocking::revoke_and_rebias(obj, false, THREAD);
-    assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now");
-  }
-
-  ObjectMonitor* monitor = ObjectSynchronizer::inflate_helper(obj());
-  return monitor->try_enter(THREAD);
-}
-
-
 // NOTE: must use heavy weight monitor to handle jni monitor exit
 void ObjectSynchronizer::jni_exit(oop obj, Thread* THREAD) {
   TEVENT(jni_exit);

hotspot/src/share/vm/runtime/synchronizer.hpp

 /*
- * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -65,7 +65,6 @@ class ObjectSynchronizer : AllStatic {
   // Used only to handle jni locks or other unmatched monitor enter/exit
   // Internally they will use heavy weight monitor.
   static void jni_enter(Handle obj, TRAPS);
-  static bool jni_try_enter(Handle obj, Thread* THREAD); // Implements Unsafe.tryMonitorEnter
   static void jni_exit(oop obj, Thread* THREAD);
 
   // Handle all interpreter, compiler and jni cases

hotspot/test/compiler/testlibrary/rtm/BusyLock.java

 /*
- * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -24,9 +24,6 @@
 
 package rtm;
 
-import com.oracle.java.testlibrary.Utils;
-import sun.misc.Unsafe;
-
 import java.util.concurrent.BrokenBarrierException;
 import java.util.concurrent.CyclicBarrier;
 
@@ -42,7 +39,6 @@ public class BusyLock implements CompilableTest, Runnable {
     // Following field have to be static in order to avoid escape analysis.
     @SuppressWarnings("UnsuedDeclaration")
     private static int field = 0;
-    private static final Unsafe UNSAFE = Utils.getUnsafe();
     protected final Object monitor;
     protected final int timeout;
 
@@ -59,18 +55,9 @@ public class BusyLock implements CompilableTest, Runnable {
     @Override
     public void run() {
         try {
-            // wait until forceAbort leave monitor
-            barrier.await();
-            if (UNSAFE.tryMonitorEnter(monitor)) {
-                try {
-                    barrier.await();
-                    Thread.sleep(timeout);
-                } finally {
-                    UNSAFE.monitorExit(monitor);
-                }
-            } else {
-                throw new RuntimeException("Monitor should be entered by " +
-                                           "::run() first.");
+            synchronized (monitor) {
+                barrier.await();
+                Thread.sleep(timeout);
             }
         } catch (InterruptedException | BrokenBarrierException e) {
             throw new RuntimeException("Synchronization error happened.", e);
@@ -79,7 +66,6 @@ public class BusyLock implements CompilableTest, Runnable {
 
     public void syncAndTest() {
         try {
-            barrier.await();
             // wait until monitor is locked by a ::run method
             barrier.await();
         } catch (InterruptedException | BrokenBarrierException e) {