1 /*
   2  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_JNIPERIODICCHECKER_HPP
  26 #define SHARE_VM_RUNTIME_JNIPERIODICCHECKER_HPP
  27 
  28 class JniPeriodicCheckerTask;
  29 
  30 /*
  31  * This gets activated under Xcheck:jni (CheckJNICalls), and is typically
  32  * to detect any errors caused by JNI applications, such as signal handler,
  33  * hijacking, va 0x0 hijacking either by mmap or an OS error.
  34  */
  35 
  36 
  37 class JniPeriodicChecker : AllStatic {
  38 
  39   friend class JniPeriodicCheckerTask;
  40 
  41   private:
  42     static JniPeriodicCheckerTask* _task;
  43 
  44   public:
  45     // Start/stop task
  46     static void engage();
  47     static void disengage();
  48 
  49     static bool is_active() { return _task != NULL; }
  50 
  51     static void initialize();
  52     static void destroy();
  53 };
  54 
  55 void jniPeriodicChecker_exit();
  56 
  57 #endif // SHARE_VM_RUNTIME_JNIPERIODICCHECKER_HPP