1.1 --- a/src/share/vm/oops/constantPool.hpp Thu Apr 25 03:58:53 2013 -0700
1.2 +++ b/src/share/vm/oops/constantPool.hpp Thu Apr 25 12:55:49 2013 -0700
1.3 @@ -111,7 +111,6 @@
1.4 int _version;
1.5 } _saved;
1.6
1.7 - Monitor* _lock;
1.8
1.9 void set_tags(Array<u1>* tags) { _tags = tags; }
1.10 void tag_at_put(int which, jbyte t) { tags()->at_put(which, t); }
1.11 @@ -823,8 +822,17 @@
1.12
1.13 void set_resolved_reference_length(int length) { _saved._resolved_reference_length = length; }
1.14 int resolved_reference_length() const { return _saved._resolved_reference_length; }
1.15 - void set_lock(Monitor* lock) { _lock = lock; }
1.16 - Monitor* lock() { return _lock; }
1.17 +
1.18 + // lock() may return null -- constant pool updates may happen before this lock is
1.19 + // initialized, because the _pool_holder has not been fully initialized and
1.20 + // has not been registered into the system dictionary. In this case, no other
1.21 + // thread can be modifying this constantpool, so no synchronization is
1.22 + // necessary.
1.23 + //
1.24 + // Use cplock() like this:
1.25 + // oop cplock = cp->lock();
1.26 + // ObjectLocker ol(cplock , THREAD, cplock != NULL);
1.27 + oop lock();
1.28
1.29 // Decrease ref counts of symbols that are in the constant pool
1.30 // when the holder class is unloaded
