os_posix.hpp revision 4989:5e3b6f79d280 
1/*
2 * Copyright (c) 1999, 2012, 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 OS_POSIX_VM_OS_POSIX_HPP
26#define OS_POSIX_VM_OS_POSIX_HPP
27class Posix {
28  friend class os;
29
30protected:
31  static void print_distro_info(outputStream* st);
32  static void print_rlimit_info(outputStream* st);
33  static void print_uname_info(outputStream* st);
34  static void print_libversion_info(outputStream* st);
35  static void print_load_average(outputStream* st);
36
37
38};
39
40/*
41 * Crash protection for the watcher thread. Wrap the callback
42 * with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp
43 * back.
44 * To be able to use this - don't take locks, don't rely on destructors,
45 * don't make OS library calls, don't allocate memory, don't print,
46 * don't call code that could leave the heap / memory in an inconsistent state,
47 * or anything else where we are not in control if we suddenly jump out.
48 */
49class WatcherThreadCrashProtection : public StackObj {
50public:
51  WatcherThreadCrashProtection();
52  bool call(os::CrashProtectionCallback& cb);
53
54  static void check_crash_protection(int signal, Thread* thread);
55private:
56  void restore();
57  sigjmp_buf _jmpbuf;
58};
59
60#endif
61