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hotspot/src/share/vm/memory/space.inline.hpp

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+/*
+ * Copyright 2000-2006 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.
+ *
+ */
+
+inline HeapWord* OffsetTableContigSpace::allocate(size_t size) {
+  HeapWord* res = ContiguousSpace::allocate(size);
+  if (res != NULL) {
+    _offsets.alloc_block(res, size);
+  }
+  return res;
+}
+
+// Because of the requirement of keeping "_offsets" up to date with the
+// allocations, we sequentialize these with a lock.  Therefore, best if
+// this is used for larger LAB allocations only.
+inline HeapWord* OffsetTableContigSpace::par_allocate(size_t size) {
+  MutexLocker x(&_par_alloc_lock);
+  // This ought to be just "allocate", because of the lock above, but that
+  // ContiguousSpace::allocate asserts that either the allocating thread
+  // holds the heap lock or it is the VM thread and we're at a safepoint.
+  // The best I (dld) could figure was to put a field in ContiguousSpace
+  // meaning "locking at safepoint taken care of", and set/reset that
+  // here.  But this will do for now, especially in light of the comment
+  // above.  Perhaps in the future some lock-free manner of keeping the
+  // coordination.
+  HeapWord* res = ContiguousSpace::par_allocate(size);
+  if (res != NULL) {
+    _offsets.alloc_block(res, size);
+  }
+  return res;
+}
+
+inline HeapWord* OffsetTableContigSpace::block_start(const void* p) const {
+  return _offsets.block_start(p);
+}
+
+inline HeapWord* ContiguousSpace::concurrent_iteration_safe_limit()
+{
+  assert(_concurrent_iteration_safe_limit <= top(),
+         "_concurrent_iteration_safe_limit update missed");
+  return _concurrent_iteration_safe_limit;
+}
+
+inline void ContiguousSpace::set_concurrent_iteration_safe_limit(HeapWord* new_limit)
+{
+  assert(new_limit <= top(), "uninitialized objects in the safe range");
+  _concurrent_iteration_safe_limit = new_limit;
+}