src/share/vm/memory/sharedHeap.cpp
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@@ -157,30 +157,37 @@
}
Monitor* SharedHeap::StrongRootsScope::_lock = new Monitor(Mutex::leaf, "StrongRootsScope lock", false);
void SharedHeap::StrongRootsScope::mark_worker_done_with_threads(uint n_workers) {
- // The Thread work barrier is only needed by G1.
+#if INCLUDE_ALL_GCS
+ // The Thread work barrier is only needed by G1 Class Unloading.
// No need to use the barrier if this is single-threaded code.
- if (UseG1GC && n_workers > 0) {
+ if (UseG1GC && ClassUnloadingWithConcurrentMark && n_workers > 0) {
uint new_value = (uint)Atomic::add(1, &_n_workers_done_with_threads);
if (new_value == n_workers) {
// This thread is last. Notify the others.
MonitorLockerEx ml(_lock, Mutex::_no_safepoint_check_flag);
_lock->notify_all();
}
}
+#endif
}
void SharedHeap::StrongRootsScope::wait_until_all_workers_done_with_threads(uint n_workers) {
+#if INCLUDE_ALL_GCS
+ assert(UseG1GC, "Currently only used by G1");
+ assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading");
+
// No need to use the barrier if this is single-threaded code.
if (n_workers > 0 && (uint)_n_workers_done_with_threads != n_workers) {
MonitorLockerEx ml(_lock, Mutex::_no_safepoint_check_flag);
while ((uint)_n_workers_done_with_threads != n_workers) {
_lock->wait(Mutex::_no_safepoint_check_flag, 0, false);
}
}
+#endif
}
void SharedHeap::process_roots(bool activate_scope,
ScanningOption so,
OopClosure* strong_roots,