src/hotspot/share/runtime/thread.cpp

@@ -87,14 +87,15 @@
  #include "runtime/interfaceSupport.inline.hpp"
  #include "runtime/java.hpp"
  #include "runtime/javaCalls.hpp"
  #include "runtime/jniHandles.inline.hpp"
  #include "runtime/jniPeriodicChecker.hpp"
+ #include "runtime/lockStack.inline.hpp"
  #include "runtime/monitorDeflationThread.hpp"
  #include "runtime/mutexLocker.hpp"
  #include "runtime/nonJavaThread.hpp"
- #include "runtime/objectMonitor.hpp"
+ #include "runtime/objectMonitor.inline.hpp"
  #include "runtime/orderAccess.hpp"
  #include "runtime/osThread.hpp"
  #include "runtime/prefetch.inline.hpp"
  #include "runtime/safepoint.hpp"
  #include "runtime/safepointMechanism.inline.hpp"

@@ -700,10 +701,11 @@
  // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being
  // used for compilation in the future. If that change is made, the need for these methods
  // should be revisited, and they should be removed if possible.
  
  bool Thread::is_lock_owned(address adr) const {
+   assert(!UseFastLocking, "maybe not call that?");
    return is_in_full_stack(adr);
  }
  
  bool Thread::set_as_starting_thread() {
    assert(_starting_thread == NULL, "already initialized: "

@@ -1089,11 +1091,12 @@
    _parker(),
    _cached_monitor_info(nullptr),
  
    _class_to_be_initialized(nullptr),
  
-   _SleepEvent(ParkEvent::Allocate(this))
+   _SleepEvent(ParkEvent::Allocate(this)),
+   _lock_stack()
  {
    set_jni_functions(jni_functions());
  
  #if INCLUDE_JVMCI
    assert(_jvmci._implicit_exception_pc == nullptr, "must be");

@@ -1567,11 +1570,12 @@
      return ret;
    }
  }
  
  bool JavaThread::is_lock_owned(address adr) const {
-   if (Thread::is_lock_owned(adr)) return true;
+   assert(!UseFastLocking, "should not be called with fast-locking");
+  if (Thread::is_lock_owned(adr)) return true;
  
    for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) {
      if (chunk->contains(adr)) return true;
    }
  

@@ -2017,10 +2021,14 @@
  #endif
  
    if (jvmti_thread_state() != NULL) {
      jvmti_thread_state()->oops_do(f, cf);
    }
+ 
+   if (!UseHeavyMonitors && UseFastLocking) {
+     lock_stack().oops_do(f);
+   }
  }
  
  void JavaThread::oops_do_frames(OopClosure* f, CodeBlobClosure* cf) {
    if (!has_last_Java_frame()) {
      return;

@@ -3707,10 +3715,11 @@
  }
  
  
  JavaThread *Threads::owning_thread_from_monitor_owner(ThreadsList * t_list,
                                                        address owner) {
+   assert(!UseFastLocking, "only with stack-locking");
    // NULL owner means not locked so we can skip the search
    if (owner == NULL) return NULL;
  
    DO_JAVA_THREADS(t_list, p) {
      // first, see if owner is the address of a Java thread

@@ -3736,10 +3745,49 @@
  
    // cannot assert on lack of success here; see above comment
    return the_owner;
  }
  
+ JavaThread* Threads::owning_thread_from_object(ThreadsList * t_list, oop obj) {
+   assert(UseFastLocking, "Only with fast-locking");
+   DO_JAVA_THREADS(t_list, q) {
+     if (q->lock_stack().contains(obj)) {
+       return q;
+     }
+   }
+   return NULL;
+ }
+ 
+ JavaThread* Threads::owning_thread_from_monitor(ThreadsList* t_list, ObjectMonitor* monitor) {
+   if (UseFastLocking) {
+     void* raw_owner = monitor->owner_raw();
+     if (raw_owner == ANONYMOUS_OWNER) {
+       return owning_thread_from_object(t_list, monitor->object());
+     } else if (raw_owner == DEFLATER_MARKER) {
+       return NULL;
+     } else {
+       Thread* owner = reinterpret_cast<Thread*>(raw_owner);
+ #ifdef ASSERT
+       if (owner != NULL) {
+         bool found = false;
+         DO_JAVA_THREADS(t_list, q) {
+           if (q == owner) {
+             found = true;;
+             break;
+           }
+         }
+         assert(found, "owner is not a thread: " PTR_FORMAT, p2i(owner));
+       }
+ #endif
+       assert(owner == NULL || owner->is_Java_thread(), "only JavaThreads own monitors");
+       return reinterpret_cast<JavaThread*>(owner);
+     }
+   } else {
+     return owning_thread_from_monitor_owner(t_list, (address)monitor->owner());
+   }
+ }
+ 
  class PrintOnClosure : public ThreadClosure {
  private:
    outputStream* _st;
  
  public: