241   assert(_lock_state != ExclusiveLock, "Can only call once");
 242   assert(*_lock >= 0, "Can not content exclusive lock");
 243 
 244   // make counter negative to block out shared locks
 245   do {
 246     val = *_lock;
 247     target = _MAGIC_ + *_lock;
 248   } while (Atomic::cmpxchg(target, _lock, val) != val);
 249 
 250   // wait for all readers to exit
 251   while (*_lock != _MAGIC_) {
 252 #ifdef _WINDOWS
 253     os::naked_short_sleep(1);
 254 #else
 255     os::naked_yield();
 256 #endif
 257   }
 258   _lock_state = ExclusiveLock;
 259 }
 260 
 261 bool MallocSiteHashtableEntry::atomic_insert(const MallocSiteHashtableEntry* entry) {
 262   return Atomic::cmpxchg(entry, (const MallocSiteHashtableEntry**)&_next, (const MallocSiteHashtableEntry*)NULL) == NULL;
 263 }

 241   assert(_lock_state != ExclusiveLock, "Can only call once");
 242   assert(*_lock >= 0, "Can not content exclusive lock");
 243 
 244   // make counter negative to block out shared locks
 245   do {
 246     val = *_lock;
 247     target = _MAGIC_ + *_lock;
 248   } while (Atomic::cmpxchg(target, _lock, val) != val);
 249 
 250   // wait for all readers to exit
 251   while (*_lock != _MAGIC_) {
 252 #ifdef _WINDOWS
 253     os::naked_short_sleep(1);
 254 #else
 255     os::naked_yield();
 256 #endif
 257   }
 258   _lock_state = ExclusiveLock;
 259 }
 260 
 261 bool MallocSiteHashtableEntry::atomic_insert(MallocSiteHashtableEntry* entry) {
 262   return Atomic::cmpxchg(entry, &_next, (MallocSiteHashtableEntry*)NULL) == NULL;
 263 }