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view src/os_cpu/linux_sparc/vm/os_linux_sparc.hpp @ 453:c96030fff130

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6684579: SoftReference processing can be made more efficient Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not. Reviewed-by: jmasa
author ysr
date Thu, 20 Nov 2008 16:56:09 -0800
parents d1605aabd0a1
children d0994e5bebce
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/*
 * Copyright 1999-2008 Sun Microsystems, Inc.  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.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

  //
  // NOTE: we are back in class os here, not Linux
  //
  static jint  (*atomic_xchg_func)        (jint,  volatile jint*);
  static jint  (*atomic_cmpxchg_func)     (jint,  volatile jint*,  jint);
  static jlong (*atomic_cmpxchg_long_func)(jlong, volatile jlong*, jlong);
  static jint  (*atomic_add_func)         (jint,  volatile jint*);
  static void  (*fence_func)              ();

  static jint  atomic_xchg_bootstrap        (jint,  volatile jint*);
  static jint  atomic_cmpxchg_bootstrap     (jint,  volatile jint*,  jint);
  static jlong atomic_cmpxchg_long_bootstrap(jlong, volatile jlong*, jlong);
  static jint  atomic_add_bootstrap         (jint,  volatile jint*);
  static void  fence_bootstrap              ();

  static void setup_fpu() {}

  static bool is_allocatable(size_t bytes);

  // Used to register dynamic code cache area with the OS
  // Note: Currently only used in 64 bit Windows implementations
  static bool register_code_area(char *low, char *high) { return true; }