6711316: Open source the Garbage-First garbage collector

First mercurial integration of the code for the Garbage-First garbage collector.

Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr

hotspot/src/share/vm/gc_implementation/g1/satbQueue.hpp

@@ -0,0 +1,105 @@
+/*
+ * Copyright 2001-2007 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.
+ *
+ */
+
+class ObjectClosure;
+class JavaThread;
+
+// A ptrQueue whose elements are "oops", pointers to object heads.
+class ObjPtrQueue: public PtrQueue {
+public:
+  ObjPtrQueue(PtrQueueSet* qset_, bool perm = false) :
+    PtrQueue(qset_, perm)
+  {}
+  // Apply the closure to all elements, and reset the index to make the
+  // buffer empty.
+  void apply_closure(ObjectClosure* cl);
+
+  // Apply the closure to all elements of "buf", down to "index" (inclusive.)
+  static void apply_closure_to_buffer(ObjectClosure* cl,
+                                      void** buf, size_t index, size_t sz);
+
+};
+
+
+
+class SATBMarkQueueSet: public PtrQueueSet {
+  ObjectClosure* _closure;
+  ObjectClosure** _par_closures;  // One per ParGCThread.
+
+  ObjPtrQueue _shared_satb_queue;
+
+  // Utility function to support sequential and parallel versions.  If
+  // "par" is true, then "worker" is the par thread id; if "false", worker
+  // is ignored.
+  bool apply_closure_to_completed_buffer_work(bool par, int worker);
+
+
+public:
+  SATBMarkQueueSet();
+
+  void initialize(Monitor* cbl_mon, Mutex* fl_lock,
+                  int max_completed_queue = 0,
+                  Mutex* lock = NULL);
+
+  static void handle_zero_index_for_thread(JavaThread* t);
+
+  // Apply "set_active(b)" to all thread tloq's.  Should be called only
+  // with the world stopped.
+  void set_active_all_threads(bool b);
+
+  // Register "blk" as "the closure" for all queues.  Only one such closure
+  // is allowed.  The "apply_closure_to_completed_buffer" method will apply
+  // this closure to a completed buffer, and "iterate_closure_all_threads"
+  // applies it to partially-filled buffers (the latter should only be done
+  // with the world stopped).
+  void set_closure(ObjectClosure* closure);
+  // Set the parallel closures: pointer is an array of pointers to
+  // closures, one for each parallel GC thread.
+  void set_par_closure(int i, ObjectClosure* closure);
+
+  // If there is a registered closure for buffers, apply it to all entries
+  // in all currently-active buffers.  This should only be applied at a
+  // safepoint.  (Currently must not be called in parallel; this should
+  // change in the future.)
+  void iterate_closure_all_threads();
+  // Parallel version of the above.
+  void par_iterate_closure_all_threads(int worker);
+
+  // If there exists some completed buffer, pop it, then apply the
+  // registered closure to all its elements, and return true.  If no
+  // completed buffers exist, return false.
+  bool apply_closure_to_completed_buffer() {
+    return apply_closure_to_completed_buffer_work(false, 0);
+  }
+  // Parallel version of the above.
+  bool par_apply_closure_to_completed_buffer(int worker) {
+    return apply_closure_to_completed_buffer_work(true, worker);
+  }
+
+  ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; }
+
+  // If a marking is being abandoned, reset any unprocessed log buffers.
+  void abandon_partial_marking();
+
+};