--- a/src/hotspot/share/gc/shared/workgroup.cpp Mon Nov 25 12:32:40 2019 +0100
+++ b/src/hotspot/share/gc/shared/workgroup.cpp Mon Nov 25 12:33:15 2019 +0100
@@ -426,7 +426,7 @@
assert(t < _n_tasks, "bad task id.");
uint old = _tasks[t];
if (old == 0) {
- old = Atomic::cmpxchg(1u, &_tasks[t], 0u);
+ old = Atomic::cmpxchg(&_tasks[t], 0u, 1u);
}
bool res = old == 0;
#ifdef ASSERT
@@ -443,7 +443,7 @@
uint old;
do {
old = observed;
- observed = Atomic::cmpxchg(old+1, &_threads_completed, old);
+ observed = Atomic::cmpxchg(&_threads_completed, old, old+1);
} while (observed != old);
// If this was the last thread checking in, clear the tasks.
uint adjusted_thread_count = (n_threads == 0 ? 1 : n_threads);
@@ -471,7 +471,7 @@
bool SequentialSubTasksDone::try_claim_task(uint& t) {
t = _n_claimed;
while (t < _n_tasks) {
- uint res = Atomic::cmpxchg(t+1, &_n_claimed, t);
+ uint res = Atomic::cmpxchg(&_n_claimed, t, t+1);
if (res == t) {
return true;
}
@@ -483,7 +483,7 @@
bool SequentialSubTasksDone::all_tasks_completed() {
uint complete = _n_completed;
while (true) {
- uint res = Atomic::cmpxchg(complete+1, &_n_completed, complete);
+ uint res = Atomic::cmpxchg(&_n_completed, complete, complete+1);
if (res == complete) {
break;
}