src/hotspot/os/solaris/os_solaris.cpp

*** 4795,4805 ****
    // that it will take two back-to-back park() calls for the owning
    // thread to block. This has the benefit of forcing a spurious return
    // from the first park() call after an unpark() call which will help
    // shake out uses of park() and unpark() without condition variables.
  
!   if (Atomic::xchg(1, &_Event) >= 0) return;
  
    // If the thread associated with the event was parked, wake it.
    // Wait for the thread assoc with the PlatformEvent to vacate.
    int status = os::Solaris::mutex_lock(_mutex);
    assert_status(status == 0, status, "mutex_lock");
--- 4795,4805 ----
    // that it will take two back-to-back park() calls for the owning
    // thread to block. This has the benefit of forcing a spurious return
    // from the first park() call after an unpark() call which will help
    // shake out uses of park() and unpark() without condition variables.
  
!   if (Atomic::xchg(&_Event, 1) >= 0) return;
  
    // If the thread associated with the event was parked, wake it.
    // Wait for the thread assoc with the PlatformEvent to vacate.
    int status = os::Solaris::mutex_lock(_mutex);
    assert_status(status == 0, status, "mutex_lock");
*** 4894,4904 ****
  
    // Optional fast-path check:
    // Return immediately if a permit is available.
    // We depend on Atomic::xchg() having full barrier semantics
    // since we are doing a lock-free update to _counter.
!   if (Atomic::xchg(0, &_counter) > 0) return;
  
    // Optional fast-exit: Check interrupt before trying to wait
    Thread* thread = Thread::current();
    assert(thread->is_Java_thread(), "Must be JavaThread");
    JavaThread *jt = (JavaThread *)thread;
--- 4894,4904 ----
  
    // Optional fast-path check:
    // Return immediately if a permit is available.
    // We depend on Atomic::xchg() having full barrier semantics
    // since we are doing a lock-free update to _counter.
!   if (Atomic::xchg(&_counter, 0) > 0) return;
  
    // Optional fast-exit: Check interrupt before trying to wait
    Thread* thread = Thread::current();
    assert(thread->is_Java_thread(), "Must be JavaThread");
    JavaThread *jt = (JavaThread *)thread;