src/share/vm/gc/g1/g1HotCardCache.cpp

rev 13453 : imported patch Atomic_add

*** 1,7 ****
  /*
!  * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ----
  /*
!  * Copyright (c) 2013, 2017, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 62,72 ****
      // The card is not hot so do not store it in the cache;
      // return it for immediate refining.
      return card_ptr;
    }
    // Otherwise, the card is hot.
!   size_t index = Atomic::add(1, &_hot_cache_idx) - 1;
    size_t masked_index = index & (_hot_cache_size - 1);
    jbyte* current_ptr = _hot_cache[masked_index];
  
    // Try to store the new card pointer into the cache. Compare-and-swap to guard
    // against the unlikely event of a race resulting in another card pointer to
--- 62,72 ----
      // The card is not hot so do not store it in the cache;
      // return it for immediate refining.
      return card_ptr;
    }
    // Otherwise, the card is hot.
!   size_t index = Atomic::add(1u, &_hot_cache_idx) - 1;
    size_t masked_index = index & (_hot_cache_size - 1);
    jbyte* current_ptr = _hot_cache[masked_index];
  
    // Try to store the new card pointer into the cache. Compare-and-swap to guard
    // against the unlikely event of a race resulting in another card pointer to