--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/runtime/jniPeriodicChecker.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,52 @@
+/*
+ * Copyright 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 JniPeriodicCheckerTask;
+
+/*
+ * This gets activated under Xcheck:jni (CheckJNICalls), and is typically
+ * to detect any errors caused by JNI applications, such as signal handler,
+ * hijacking, va 0x0 hijacking either by mmap or an OS error.
+ */
+
+
+class JniPeriodicChecker : AllStatic {
+
+  friend class JniPeriodicCheckerTask;
+
+  private:
+    static JniPeriodicCheckerTask* _task;
+
+  public:
+    // Start/stop task
+    static void engage();
+    static void disengage();
+
+    static bool is_active() { return _task != NULL; }
+
+    static void initialize();
+    static void destroy();
+};
+
+void jniPeriodicChecker_exit();