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src/os/posix/vm/os_posix.hpp
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rev 8910 : full patch for jfr
@@ -1,7 +1,7 @@
/*
- * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2019, 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.
@@ -60,10 +60,37 @@
static void print_siginfo_brief(outputStream* os, const siginfo_t* si);
};
/*
+ * Crash protection utility used by JFR. 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(os::CrashProtectionCallback& cb);
+
+ static void check_crash_protection(int signal, Thread* thread);
+private:
+ static Thread* _protected_thread;
+ static ThreadCrashProtection* _crash_protection;
+ static volatile intptr_t _crash_mux;
+ void restore();
+ sigjmp_buf _jmpbuf;
+};
+
+/*
* Crash protection for the watcher 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,
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