--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/gc_implementation/shared/vmGCOperations.cpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,146 @@
+/*
+ * 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.
+ *
+ */
+# include "incls/_precompiled.incl"
+# include "incls/_vmGCOperations.cpp.incl"
+
+HS_DTRACE_PROBE_DECL1(hotspot, gc__begin, bool);
+HS_DTRACE_PROBE_DECL(hotspot, gc__end);
+
+// The same dtrace probe can't be inserted in two different files, so we
+// have to call it here, so it's only in one file.  Can't create new probes
+// for the other file anymore.   The dtrace probes have to remain stable.
+void VM_GC_Operation::notify_gc_begin(bool full) {
+  HS_DTRACE_PROBE1(hotspot, gc__begin, full);
+}
+
+void VM_GC_Operation::notify_gc_end() {
+  HS_DTRACE_PROBE(hotspot, gc__end);
+}
+
+void VM_GC_Operation::acquire_pending_list_lock() {
+  // we may enter this with pending exception set
+  instanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock);
+}
+
+
+void VM_GC_Operation::release_and_notify_pending_list_lock() {
+
+  instanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock);
+}
+
+// Allocations may fail in several threads at about the same time,
+// resulting in multiple gc requests.  We only want to do one of them.
+// In case a GC locker is active and the need for a GC is already signalled,
+// we want to skip this GC attempt altogether, without doing a futile
+// safepoint operation.
+bool VM_GC_Operation::skip_operation() const {
+  bool skip = (_gc_count_before != Universe::heap()->total_collections());
+  if (_full && skip) {
+    skip = (_full_gc_count_before != Universe::heap()->total_full_collections());
+  }
+  if (!skip && GC_locker::is_active_and_needs_gc()) {
+    skip = Universe::heap()->is_maximal_no_gc();
+    assert(!(skip && (_gc_cause == GCCause::_gc_locker)),
+           "GC_locker cannot be active when initiating GC");
+  }
+  return skip;
+}
+
+bool VM_GC_Operation::doit_prologue() {
+  assert(Thread::current()->is_Java_thread(), "just checking");
+
+  acquire_pending_list_lock();
+  // If the GC count has changed someone beat us to the collection
+  // Get the Heap_lock after the pending_list_lock.
+  Heap_lock->lock();
+  // Check invocations
+  if (skip_operation()) {
+    // skip collection
+    Heap_lock->unlock();
+    release_and_notify_pending_list_lock();
+    _prologue_succeeded = false;
+  } else {
+    _prologue_succeeded = true;
+  }
+  return _prologue_succeeded;
+}
+
+
+void VM_GC_Operation::doit_epilogue() {
+  assert(Thread::current()->is_Java_thread(), "just checking");
+  // Release the Heap_lock first.
+  Heap_lock->unlock();
+  release_and_notify_pending_list_lock();
+}
+
+bool VM_GC_HeapInspection::doit_prologue() {
+  if (Universe::heap()->supports_heap_inspection()) {
+    return VM_GC_Operation::doit_prologue();
+  } else {
+    return false;
+  }
+}
+
+bool VM_GC_HeapInspection::skip_operation() const {
+  assert(Universe::heap()->supports_heap_inspection(), "huh?");
+  return false;
+}
+
+void VM_GC_HeapInspection::doit() {
+  HandleMark hm;
+  CollectedHeap* ch = Universe::heap();
+  if (_full_gc) {
+    ch->collect_as_vm_thread(GCCause::_heap_inspection);
+  } else {
+    // make the heap parsable (no need to retire TLABs)
+    ch->ensure_parsability(false);
+  }
+  HeapInspection::heap_inspection(_out);
+}
+
+
+void VM_GenCollectForAllocation::doit() {
+  JvmtiGCForAllocationMarker jgcm;
+  notify_gc_begin(false);
+
+  GenCollectedHeap* gch = GenCollectedHeap::heap();
+  GCCauseSetter gccs(gch, _gc_cause);
+  _res = gch->satisfy_failed_allocation(_size, _tlab);
+  assert(gch->is_in_reserved_or_null(_res), "result not in heap");
+
+  if (_res == NULL && GC_locker::is_active_and_needs_gc()) {
+    set_gc_locked();
+  }
+  notify_gc_end();
+}
+
+void VM_GenCollectFull::doit() {
+  JvmtiGCFullMarker jgcm;
+  notify_gc_begin(true);
+
+  GenCollectedHeap* gch = GenCollectedHeap::heap();
+  GCCauseSetter gccs(gch, _gc_cause);
+  gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level);
+  notify_gc_end();
+}