--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/gc_implementation/parNew/asParNewGeneration.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2005-2006 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.
+ *
+ */
+
+// A Generation that does parallel young-gen collection extended
+// for adaptive size policy.
+
+// Division of generation into spaces
+// done by DefNewGeneration::compute_space_boundaries()
+//      +---------------+
+//      | uncommitted   |
+//      |---------------|
+//      | ss0           |
+//      |---------------|
+//      | ss1           |
+//      |---------------|
+//      |               |
+//      | eden          |
+//      |               |
+//      +---------------+       <-- low end of VirtualSpace
+//
+class ASParNewGeneration: public ParNewGeneration {
+
+  size_t _min_gen_size;
+
+  // Resize the generation based on the desired sizes of
+  // the constituent spaces.
+  bool resize_generation(size_t eden_size, size_t survivor_size);
+  // Resize the spaces based on their desired sizes but
+  // respecting the maximum size of the generation.
+  void resize_spaces(size_t eden_size, size_t survivor_size);
+  // Return the byte size remaining to the minimum generation size.
+  size_t available_to_min_gen();
+  // Return the byte size remaining to the live data in the generation.
+  size_t available_to_live() const;
+  // Return the byte size that the generation is allowed to shrink.
+  size_t limit_gen_shrink(size_t bytes);
+  // Reset the size of the spaces after a shrink of the generation.
+  void reset_survivors_after_shrink();
+
+  // Accessor
+  VirtualSpace* virtual_space() { return &_virtual_space; }
+
+  virtual void adjust_desired_tenuring_threshold();
+
+ public:
+
+  ASParNewGeneration(ReservedSpace rs,
+                     size_t initial_byte_size,
+                     size_t min_byte_size,
+                     int level);
+
+  virtual const char* short_name() const { return "ASParNew"; }
+  virtual const char* name() const;
+  virtual Generation::Name kind() { return ASParNew; }
+
+  // Change the sizes of eden and the survivor spaces in
+  // the generation.  The parameters are desired sizes
+  // and are not guaranteed to be met.  For example, if
+  // the total is larger than the generation.
+  void resize(size_t eden_size, size_t survivor_size);
+
+  virtual void compute_new_size();
+
+  size_t max_gen_size()                 { return _reserved.byte_size(); }
+  size_t min_gen_size() const           { return _min_gen_size; }
+
+  // Space boundary invariant checker
+  void space_invariants() PRODUCT_RETURN;
+};