Quelle threadCrashProtection_posix.hpp Sprache: C

/*
* Copyright (c) 2017, 2022, Oracle and/or its affiliates. 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#ifndef OS_POSIX_THREADCRASHPROTECTION_POSIX_HPP
#define OS_POSIX_THREADCRASHPROTECTION_POSIX_HPP

#include "memory/allocation.hpp"

#include <setjmp.h>

class CrashProtectionCallback;
class Thread;

/*
* Crash protection for the JfrSampler thread. Wrap the callback
* with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp
* back.
* To be able to use this - don't take locks, don't rely on destructors,
* don't make OS library calls, don't allocate memory, don't print,
* don't call code that could leave the heap / memory in an inconsistent state,
* or anything else where we are not in control if we suddenly jump out.
*/
class ThreadCrashProtection : public StackObj {
public:
  static bool is_crash_protected(Thread* thr) {
    return _crash_protection != NULL && _protected_thread == thr;
  }

  ThreadCrashProtection();
  bool call(CrashProtectionCallback& cb);

  static void check_crash_protection(int signal, Thread* thread);
private:
  static Thread* _protected_thread;
  static ThreadCrashProtection* _crash_protection;
  void restore();
  sigjmp_buf _jmpbuf;
};

#endif // OS_POSIX_THREADCRASHPROTECTION_POSIX_HPP

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