--- a/src/hotspot/os/posix/os_posix.cpp Mon Nov 25 12:32:07 2019 +0100
+++ b/src/hotspot/os/posix/os_posix.cpp Mon Nov 25 12:32:40 2019 +0100
@@ -1998,7 +1998,7 @@
// but only in the correctly written condition checking loops of ObjectMonitor,
// Mutex/Monitor, Thread::muxAcquire and JavaThread::sleep
- if (Atomic::xchg(1, &_event) >= 0) return;
+ if (Atomic::xchg(&_event, 1) >= 0) return;
int status = pthread_mutex_lock(_mutex);
assert_status(status == 0, status, "mutex_lock");
@@ -2046,7 +2046,7 @@
// 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;
+ if (Atomic::xchg(&_counter, 0) > 0) return;
Thread* thread = Thread::current();
assert(thread->is_Java_thread(), "Must be JavaThread");