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src/hotspot/share/oops/markOop.hpp

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rev 54613 : imported patch dcubed.monitor_deflate_conc.v2.01


 192   markOop set_bias_epoch(int epoch) {
 193     assert(has_bias_pattern(), "should not call this otherwise");
 194     assert((epoch & (~epoch_mask)) == 0, "epoch overflow");
 195     return markOop(mask_bits(value(), ~epoch_mask_in_place) | (epoch << epoch_shift));
 196   }
 197   markOop incr_bias_epoch() {
 198     return set_bias_epoch((1 + bias_epoch()) & epoch_mask);
 199   }
 200   // Prototype mark for initialization
 201   static markOop biased_locking_prototype() {
 202     return markOop( biased_lock_pattern );
 203   }
 204 
 205   // lock accessors (note that these assume lock_shift == 0)
 206   bool is_locked()   const {
 207     return (mask_bits(value(), lock_mask_in_place) != unlocked_value);
 208   }
 209   bool is_unlocked() const {
 210     return (mask_bits(value(), biased_lock_mask_in_place) == unlocked_value);
 211   }




 212   bool is_marked()   const {
 213     return (mask_bits(value(), lock_mask_in_place) == marked_value);
 214   }
 215   bool is_neutral()  const { return (mask_bits(value(), biased_lock_mask_in_place) == unlocked_value); }
 216 
 217   // Special temporary state of the markOop while being inflated.
 218   // Code that looks at mark outside a lock need to take this into account.
 219   bool is_being_inflated() const { return (value() == 0); }
 220 
 221   // Distinguished markword value - used when inflating over
 222   // an existing stacklock.  0 indicates the markword is "BUSY".
 223   // Lockword mutators that use a LD...CAS idiom should always
 224   // check for and avoid overwriting a 0 value installed by some
 225   // other thread.  (They should spin or block instead.  The 0 value
 226   // is transient and *should* be short-lived).
 227   static markOop INFLATING() { return (markOop) 0; }    // inflate-in-progress
 228 
 229   // Should this header be preserved during GC?
 230   inline bool must_be_preserved(oop obj_containing_mark) const;
 231   inline bool must_be_preserved_with_bias(oop obj_containing_mark) const;




 192   markOop set_bias_epoch(int epoch) {
 193     assert(has_bias_pattern(), "should not call this otherwise");
 194     assert((epoch & (~epoch_mask)) == 0, "epoch overflow");
 195     return markOop(mask_bits(value(), ~epoch_mask_in_place) | (epoch << epoch_shift));
 196   }
 197   markOop incr_bias_epoch() {
 198     return set_bias_epoch((1 + bias_epoch()) & epoch_mask);
 199   }
 200   // Prototype mark for initialization
 201   static markOop biased_locking_prototype() {
 202     return markOop( biased_lock_pattern );
 203   }
 204 
 205   // lock accessors (note that these assume lock_shift == 0)
 206   bool is_locked()   const {
 207     return (mask_bits(value(), lock_mask_in_place) != unlocked_value);
 208   }
 209   bool is_unlocked() const {
 210     return (mask_bits(value(), biased_lock_mask_in_place) == unlocked_value);
 211   }
 212   // ObjectMonitor::install_displaced_markword_in_object() uses
 213   // is_marked() on ObjectMonitor::_header as part of the restoration
 214   // protocol for an object's header. In this usage, the mark bits are
 215   // only ever set (and cleared) on the ObjectMonitor::_header field.
 216   bool is_marked()   const {
 217     return (mask_bits(value(), lock_mask_in_place) == marked_value);
 218   }
 219   bool is_neutral()  const { return (mask_bits(value(), biased_lock_mask_in_place) == unlocked_value); }
 220 
 221   // Special temporary state of the markOop while being inflated.
 222   // Code that looks at mark outside a lock need to take this into account.
 223   bool is_being_inflated() const { return (value() == 0); }
 224 
 225   // Distinguished markword value - used when inflating over
 226   // an existing stacklock.  0 indicates the markword is "BUSY".
 227   // Lockword mutators that use a LD...CAS idiom should always
 228   // check for and avoid overwriting a 0 value installed by some
 229   // other thread.  (They should spin or block instead.  The 0 value
 230   // is transient and *should* be short-lived).
 231   static markOop INFLATING() { return (markOop) 0; }    // inflate-in-progress
 232 
 233   // Should this header be preserved during GC?
 234   inline bool must_be_preserved(oop obj_containing_mark) const;
 235   inline bool must_be_preserved_with_bias(oop obj_containing_mark) const;


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