src/hotspot/share/runtime/thread.cpp

@@ -572,10 +572,14 @@
  //
  // We employ a spin lock _only for low-contention, fixed-length
  // short-duration critical sections where we're concerned
  // about native mutex_t or HotSpot Mutex:: latency.
  
+ bool Thread::TrySpinAcquire(volatile int * adr) {
+   return AtomicAccess::cmpxchg(adr, 0, 1) == 0;
+ }
+ 
  void Thread::SpinAcquire(volatile int * adr) {
    if (AtomicAccess::cmpxchg(adr, 0, 1) == 0) {
      return;   // normal fast-path return
    }