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src/hotspot/share/runtime/objectMonitor.inline.hpp
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rev 59376 : 8153224.v2.10.patch merged with 8153224.v2.11.patch.
rev 59377 : CR1 changes from dcubed, dholmes, eosterlund and rehn.
rev 59378 : CR changes from dholmes, dcubed; fix is_being_async_deflated() race found by eosterlund; WB_ForceSafepoint() should request a special clean up with AsyncDeflateIdleMonitors; add a barrier in install_displaced_markword_in_object() to separate the header load from the preceding loads in is_being_async_deflated().
rev 59379 : eosterlund CR - Switch from three part async deflation protocol to a two part async deflation protocol where a negative contentions field is a linearization point.
*** 50,72 ****
inline jint ObjectMonitor::waiters() const {
return _waiters;
}
inline void* ObjectMonitor::owner() const {
! return _owner;
}
inline void ObjectMonitor::clear() {
assert(Atomic::load(&_header).value() != 0, "must be non-zero");
! 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=" INTX_FORMAT, _recursions);
assert(_object != NULL, "must be non-NULL");
- assert(_owner == NULL, "must be NULL: owner=" INTPTR_FORMAT, p2i(_owner));
! Atomic::store(&_header, markWord::zero());
_object = NULL;
}
inline void* ObjectMonitor::object() const {
return _object;
--- 50,104 ----
inline jint ObjectMonitor::waiters() const {
return _waiters;
}
+ // Returns NULL if DEFLATER_MARKER is observed.
inline void* ObjectMonitor::owner() const {
! void* owner = _owner;
! return owner != DEFLATER_MARKER ? owner : NULL;
! }
!
! // Returns true if owner field == DEFLATER_MARKER and false otherwise.
! // This accessor is called when we really need to know if the owner
! // field == DEFLATER_MARKER and any non-NULL value won't do the trick.
! inline bool ObjectMonitor::owner_is_DEFLATER_MARKER() {
! return Atomic::load(&_owner) == DEFLATER_MARKER;
! }
!
! // Returns true if 'this' is being async deflated and false otherwise.
! inline bool ObjectMonitor::is_being_async_deflated() {
! return AsyncDeflateIdleMonitors && contentions() < 0;
}
inline void ObjectMonitor::clear() {
assert(Atomic::load(&_header).value() != 0, "must be non-zero");
! assert(_owner == NULL, "must be NULL: owner=" INTPTR_FORMAT, p2i(_owner));
!
! Atomic::store(&_header, markWord::zero());
!
! clear_common();
! }
!
! inline void ObjectMonitor::clear_common() {
! if (AsyncDeflateIdleMonitors) {
! // Async deflation protocol uses the header, owner and contentions
! // fields. While the ObjectMonitor being deflated is on the global
! // free list, we leave those three fields alone; contentions < 0
! // will force any racing threads to retry. The header field is used
! // by install_displaced_markword_in_object() to restore the object's
! // header so we cannot check its value here.
! guarantee(_owner == NULL || _owner == DEFLATER_MARKER,
! "must be NULL or DEFLATER_MARKER: owner=" INTPTR_FORMAT,
! p2i(_owner));
! }
! assert(contentions() <= 0, "must not be positive: contentions=%d", contentions());
assert(_waiters == 0, "must be 0: waiters=%d", _waiters);
assert(_recursions == 0, "must be 0: recursions=" INTX_FORMAT, _recursions);
assert(_object != NULL, "must be non-NULL");
! set_allocation_state(Free);
_object = NULL;
}
inline void* ObjectMonitor::object() const {
return _object;
*** 78,120 ****
inline void ObjectMonitor::set_object(void* obj) {
_object = obj;
}
! // return number of threads contending for this monitor
inline jint ObjectMonitor::contentions() const {
! return _contentions;
}
// Clear _owner field; current value must match old_value.
inline void ObjectMonitor::release_clear_owner(void* old_value) {
! DEBUG_ONLY(void* prev = Atomic::load(&_owner);)
! assert(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
Atomic::release_store(&_owner, (void*)NULL);
log_trace(monitorinflation, owner)("release_clear_owner(): mid="
INTPTR_FORMAT ", old_value=" INTPTR_FORMAT,
p2i(this), p2i(old_value));
}
// Simply set _owner field to new_value; current value must match old_value.
// (Simple means no memory sync needed.)
inline void ObjectMonitor::set_owner_from(void* old_value, void* new_value) {
! DEBUG_ONLY(void* prev = Atomic::load(&_owner);)
! assert(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
Atomic::store(&_owner, new_value);
log_trace(monitorinflation, owner)("set_owner_from(): mid="
INTPTR_FORMAT ", old_value=" INTPTR_FORMAT
", new_value=" INTPTR_FORMAT, p2i(this),
p2i(old_value), p2i(new_value));
}
// Simply set _owner field to self; current value must match basic_lock_p.
inline void ObjectMonitor::set_owner_from_BasicLock(void* basic_lock_p, Thread* self) {
! DEBUG_ONLY(void* prev = Atomic::load(&_owner);)
! assert(prev == basic_lock_p, "unexpected prev owner=" INTPTR_FORMAT
", expected=" INTPTR_FORMAT, p2i(prev), p2i(basic_lock_p));
// Non-null owner field to non-null owner field is safe without
// cmpxchg() as long as all readers can tolerate either flavor.
Atomic::store(&_owner, self);
log_trace(monitorinflation, owner)("set_owner_from_BasicLock(): mid="
--- 110,174 ----
inline void ObjectMonitor::set_object(void* obj) {
_object = obj;
}
! // Return number of threads contending for this monitor.
inline jint ObjectMonitor::contentions() const {
! return Atomic::load(&_contentions);
! }
!
! // Add value to the contentions field.
! inline void ObjectMonitor::add_to_contentions(jint value) {
! Atomic::add(&_contentions, value);
}
// Clear _owner field; current value must match old_value.
inline void ObjectMonitor::release_clear_owner(void* old_value) {
! void* prev = Atomic::load(&_owner);
! ADIM_guarantee(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
Atomic::release_store(&_owner, (void*)NULL);
log_trace(monitorinflation, owner)("release_clear_owner(): mid="
INTPTR_FORMAT ", old_value=" INTPTR_FORMAT,
p2i(this), p2i(old_value));
}
// Simply set _owner field to new_value; current value must match old_value.
// (Simple means no memory sync needed.)
inline void ObjectMonitor::set_owner_from(void* old_value, void* new_value) {
! void* prev = Atomic::load(&_owner);
! ADIM_guarantee(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
Atomic::store(&_owner, new_value);
log_trace(monitorinflation, owner)("set_owner_from(): mid="
INTPTR_FORMAT ", old_value=" INTPTR_FORMAT
", new_value=" INTPTR_FORMAT, p2i(this),
p2i(old_value), p2i(new_value));
}
+ // Simply set _owner field to new_value; current value must match old_value1 or old_value2.
+ // (Simple means no memory sync needed.)
+ inline void ObjectMonitor::set_owner_from(void* old_value1, void* old_value2, void* new_value) {
+ void* prev = Atomic::load(&_owner);
+ ADIM_guarantee(prev == old_value1 || prev == old_value2,
+ "unexpected prev owner=" INTPTR_FORMAT ", expected1="
+ INTPTR_FORMAT " or expected2=" INTPTR_FORMAT, p2i(prev),
+ p2i(old_value1), p2i(old_value2));
+ _owner = new_value;
+ log_trace(monitorinflation, owner)("set_owner_from(old1=" INTPTR_FORMAT
+ ", old2=" INTPTR_FORMAT "): mid="
+ INTPTR_FORMAT ", prev=" INTPTR_FORMAT
+ ", new=" INTPTR_FORMAT, p2i(old_value1),
+ p2i(old_value2), p2i(this), p2i(prev),
+ p2i(new_value));
+ }
+
// Simply set _owner field to self; current value must match basic_lock_p.
inline void ObjectMonitor::set_owner_from_BasicLock(void* basic_lock_p, Thread* self) {
! void* prev = Atomic::load(&_owner);
! ADIM_guarantee(prev == basic_lock_p, "unexpected prev owner=" INTPTR_FORMAT
", expected=" INTPTR_FORMAT, p2i(prev), p2i(basic_lock_p));
// Non-null owner field to non-null owner field is safe without
// cmpxchg() as long as all readers can tolerate either flavor.
Atomic::store(&_owner, self);
log_trace(monitorinflation, owner)("set_owner_from_BasicLock(): mid="
*** 135,144 ****
--- 189,218 ----
p2i(prev), p2i(new_value));
}
return prev;
}
+ 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_old() const {
+ return _allocation_state == Old;
+ }
+
+ inline bool ObjectMonitor::is_new() const {
+ return _allocation_state == New;
+ }
+
// The _next_om field can be concurrently read and modified so we
// use Atomic operations to disable compiler optimizations that
// might try to elide loading and/or storing this field.
inline ObjectMonitor* ObjectMonitor::next_om() const {
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