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

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+/*
+ * Copyright 2000-2005 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 bool GC_locker::is_active() {
+  return _lock_count > 0 || _jni_lock_count > 0;
+}
+
+inline bool GC_locker::check_active_before_gc() {
+  if (is_active()) {
+    set_needs_gc();
+  }
+  return is_active();
+}
+
+inline void GC_locker::lock() {
+  // cast away volatile
+  Atomic::inc(&_lock_count);
+  CHECK_UNHANDLED_OOPS_ONLY(
+    if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; })
+  assert(Universe::heap() == NULL ||
+         !Universe::heap()->is_gc_active(), "locking failed");
+}
+
+inline void GC_locker::unlock() {
+  // cast away volatile
+  Atomic::dec(&_lock_count);
+  CHECK_UNHANDLED_OOPS_ONLY(
+    if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count--; })
+}
+
+inline void GC_locker::lock_critical(JavaThread* thread) {
+  if (!thread->in_critical()) {
+    if (!needs_gc()) {
+      jni_lock();
+    } else {
+      jni_lock_slow();
+    }
+  }
+  thread->enter_critical();
+}
+
+inline void GC_locker::unlock_critical(JavaThread* thread) {
+  thread->exit_critical();
+  if (!thread->in_critical()) {
+    if (!needs_gc()) {
+      jni_unlock();
+    } else {
+      jni_unlock_slow();
+    }
+  }
+}