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src/hotspot/share/jfr/recorder/service/jfrPostBox.cpp

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@@ -137,11 +137,11 @@
   return Atomic::load(&_messages) == 0;
 }
 
 int JfrPostBox::collect() {
   // get pending and reset to 0
-  const int messages = Atomic::xchg(0, &_messages);
+  const int messages = Atomic::xchg(&_messages, 0);
   if (check_waiters(messages)) {
     _has_waiters = true;
     assert(JfrMsg_lock->owned_by_self(), "incrementing _msg_read_serial is protected by JfrMsg_lock");
     // Update made visible on release of JfrMsg_lock via fence instruction in Monitor::IUnlock.
     ++_msg_read_serial;
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