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