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src/os/posix/vm/os_posix.hpp

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  45 
  46   // Returns one-line short description of a signal set in a user provided buffer.
  47   static const char* describe_signal_set_short(const sigset_t* set, char* buffer, size_t size);
  48 
  49   // Prints a short one-line description of a signal set.
  50   static void print_signal_set_short(outputStream* st, const sigset_t* set);
  51 
  52   // Writes a one-line description of a combination of sigaction.sa_flags
  53   // into a user provided buffer. Returns that buffer.
  54   static const char* describe_sa_flags(int flags, char* buffer, size_t size);
  55 
  56   // Prints a one-line description of a combination of sigaction.sa_flags.
  57   static void print_sa_flags(outputStream* st, int flags);
  58 
  59   // A POSIX conform, platform-independend siginfo print routine.
  60   static void print_siginfo_brief(outputStream* os, const siginfo_t* si);
  61 
  62 };
  63 
  64 /*
  65  * Crash protection for the watcher thread. Wrap the callback
  66  * with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp
  67  * back.
  68  * To be able to use this - don't take locks, don't rely on destructors,
  69  * don't make OS library calls, don't allocate memory, don't print,
  70  * don't call code that could leave the heap / memory in an inconsistent state,
  71  * or anything else where we are not in control if we suddenly jump out.
  72  */
  73 class WatcherThreadCrashProtection : public StackObj {
  74 public:
  75   WatcherThreadCrashProtection();




  76   bool call(os::CrashProtectionCallback& cb);
  77 
  78   static void check_crash_protection(int signal, Thread* thread);
  79 private:



  80   void restore();
  81   sigjmp_buf _jmpbuf;
  82 };
  83 
  84 #endif // OS_POSIX_VM_OS_POSIX_HPP


  45 
  46   // Returns one-line short description of a signal set in a user provided buffer.
  47   static const char* describe_signal_set_short(const sigset_t* set, char* buffer, size_t size);
  48 
  49   // Prints a short one-line description of a signal set.
  50   static void print_signal_set_short(outputStream* st, const sigset_t* set);
  51 
  52   // Writes a one-line description of a combination of sigaction.sa_flags
  53   // into a user provided buffer. Returns that buffer.
  54   static const char* describe_sa_flags(int flags, char* buffer, size_t size);
  55 
  56   // Prints a one-line description of a combination of sigaction.sa_flags.
  57   static void print_sa_flags(outputStream* st, int flags);
  58 
  59   // A POSIX conform, platform-independend siginfo print routine.
  60   static void print_siginfo_brief(outputStream* os, const siginfo_t* si);
  61 
  62 };
  63 
  64 /*
  65  * Crash protection utility used by JFR. Wrap the callback
  66  * with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp
  67  * back.
  68  * To be able to use this - don't take locks, don't rely on destructors,
  69  * don't make OS library calls, don't allocate memory, don't print,
  70  * don't call code that could leave the heap / memory in an inconsistent state,
  71  * or anything else where we are not in control if we suddenly jump out.
  72  */
  73 class ThreadCrashProtection : public StackObj {
  74 public:
  75   static bool is_crash_protected(Thread* thr) {
  76     return _crash_protection != NULL && _protected_thread == thr;
  77   }
  78 
  79   ThreadCrashProtection();
  80   bool call(os::CrashProtectionCallback& cb);
  81 
  82   static void check_crash_protection(int signal, Thread* thread);
  83 private:
  84   static Thread* _protected_thread;
  85   static ThreadCrashProtection* _crash_protection;
  86   static volatile intptr_t _crash_mux;
  87   void restore();
  88   sigjmp_buf _jmpbuf;
  89 };
  90 
  91 #endif // OS_POSIX_VM_OS_POSIX_HPP
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