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src/hotspot/share/runtime/objectMonitor.inline.hpp
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rev 54612 : Checkpoint latest preliminary review patches for full OpenJDK review; merge with 8222295.patch.
rev 54613 : imported patch dcubed.monitor_deflate_conc.v2.01
rev 54614 : imported patch dcubed.monitor_deflate_conc.v2.02
rev 54615 : imported patch dcubed.monitor_deflate_conc.v2.03
@@ -47,23 +47,50 @@
inline jint ObjectMonitor::waiters() const {
return _waiters;
}
+// Returns NULL if DEFLATER_MARKER is observed.
inline void* ObjectMonitor::owner() const {
- return _owner;
+ void* owner = _owner;
+ return owner != DEFLATER_MARKER ? owner : NULL;
}
inline void ObjectMonitor::clear() {
assert(_header != NULL, "must be non-NULL");
+ assert(_owner == NULL, "must be NULL: owner=" INTPTR_FORMAT, p2i(_owner));
+ assert(_ref_count == 0, "must be 0: ref_count=%d", _ref_count);
+
+ _header = NULL;
+
+ clear_using_JT();
+}
+
+inline void ObjectMonitor::clear_using_JT() {
+ // Unlike other *_using_JT() functions, we cannot assert
+ // AsyncDeflateIdleMonitors or Thread::current()->is_Java_thread()
+ // because clear() calls this function for the rest of its checks.
+
+ if (AsyncDeflateIdleMonitors) {
+ // Async deflation protocol uses the header, owner and ref_count
+ // fields. While the ObjectMonitor being deflated is on the global free
+ // list, we leave those three fields alone; owner == DEFLATER_MARKER
+ // and ref_count < 0 will force any racing threads to retry. The
+ // header field is used by install_displaced_markword_in_object()
+ // in the last part of the deflation protocol so we cannot check
+ // its value here.
+ guarantee(_owner == NULL || _owner == DEFLATER_MARKER,
+ "must be NULL or DEFLATER_MARKER: owner=" INTPTR_FORMAT,
+ p2i(_owner));
+ guarantee(_ref_count <= 0, "must be <= 0: ref_count=%d", _ref_count);
+ }
assert(_contentions == 0, "must be 0: contentions=%d", _contentions);
assert(_waiters == 0, "must be 0: waiters=%d", _waiters);
assert(_recursions == 0, "must be 0: recursions=" INTPTR_FORMAT, _recursions);
assert(_object != NULL, "must be non-NULL");
- assert(_owner == NULL, "must be NULL: owner=" INTPTR_FORMAT, p2i(_owner));
- _header = NULL;
+ set_allocation_state(Free);
_object = NULL;
}
inline void* ObjectMonitor::object() const {
return _object;
@@ -101,6 +128,53 @@
inline void ObjectMonitor::set_owner(void* owner) {
_owner = owner;
_recursions = 0;
}
+inline void ObjectMonitor::set_allocation_state(ObjectMonitor::AllocationState s) {
+ _allocation_state = s;
+}
+
+inline ObjectMonitor::AllocationState ObjectMonitor::allocation_state() const {
+ return _allocation_state;
+}
+
+inline bool ObjectMonitor::is_free() const {
+ return _allocation_state == Free;
+}
+
+inline bool ObjectMonitor::is_active() const {
+ return !is_free();
+}
+
+inline bool ObjectMonitor::is_old() const {
+ return _allocation_state == Old;
+}
+
+inline bool ObjectMonitor::is_new() const {
+ return _allocation_state == New;
+}
+
+inline void ObjectMonitor::dec_ref_count() {
+ // The decrement only needs to be MO_ACQ_REL since the reference
+ // counter is volatile.
+ Atomic::dec(&_ref_count);
+ // Can be negative as part of async deflation protocol.
+ guarantee(AsyncDeflateIdleMonitors || _ref_count >= 0,
+ "sanity check: ref_count=%d", _ref_count);
+}
+
+inline void ObjectMonitor::inc_ref_count() {
+ // The increment needs to be MO_SEQ_CST so that the reference
+ // counter update is seen as soon as possible in a race with the
+ // async deflation protocol.
+ Atomic::inc(&_ref_count);
+ // Can be negative as part of async deflation protocol.
+ guarantee(AsyncDeflateIdleMonitors || _ref_count > 0,
+ "sanity check: ref_count=%d", _ref_count);
+}
+
+inline jint ObjectMonitor::ref_count() const {
+ return OrderAccess::load_acquire(&_ref_count);
+}
+
#endif // SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP
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