1.1 --- a/src/os/posix/vm/os_posix.hpp Thu Aug 01 03:44:03 2019 +0100
1.2 +++ b/src/os/posix/vm/os_posix.hpp Mon Aug 12 18:30:40 2019 +0300
1.3 @@ -62,6 +62,33 @@
1.4 };
1.5
1.6 /*
1.7 + * Crash protection utility used by JFR. Wrap the callback
1.8 + * with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp
1.9 + * back.
1.10 + * To be able to use this - don't take locks, don't rely on destructors,
1.11 + * don't make OS library calls, don't allocate memory, don't print,
1.12 + * don't call code that could leave the heap / memory in an inconsistent state,
1.13 + * or anything else where we are not in control if we suddenly jump out.
1.14 + */
1.15 +class ThreadCrashProtection : public StackObj {
1.16 +public:
1.17 + static bool is_crash_protected(Thread* thr) {
1.18 + return _crash_protection != NULL && _protected_thread == thr;
1.19 + }
1.20 +
1.21 + ThreadCrashProtection();
1.22 + bool call(os::CrashProtectionCallback& cb);
1.23 +
1.24 + static void check_crash_protection(int signal, Thread* thread);
1.25 +private:
1.26 + static Thread* _protected_thread;
1.27 + static ThreadCrashProtection* _crash_protection;
1.28 + static volatile intptr_t _crash_mux;
1.29 + void restore();
1.30 + sigjmp_buf _jmpbuf;
1.31 +};
1.32 +
1.33 +/*
1.34 * Crash protection for the watcher thread. Wrap the callback
1.35 * with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp
1.36 * back.
