jdk8-mips64-public/hotspot: src/share/vm/runtime/java.hpp@2b42b31e7928 (annotated)

src/share/vm/runtime/java.hpp@2b42b31e7928 (annotated)

src/share/vm/runtime/java.hpp

Fri, 21 Nov 2008 08:09:11 -0800

author: coleenp
date: Fri, 21 Nov 2008 08:09:11 -0800
changeset 882: 2b42b31e7928
parent 677: d95b224e9f17
child 1907: c18cbe5936b8
permissions: -rw-r--r--

6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
Summary: Add test for biased locking epoch before walking own thread stack in case of rare race
Reviewed-by: phh, never

 /*
  * Copyright 1997-2008 Sun Microsystems, Inc.  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).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 // Register function to be called by before_exit
 extern "C" { void register_on_exit_function(void (*func)(void)) ;}
 // Execute code before all handles are released and thread is killed; prologue to vm_exit
 extern void before_exit(JavaThread * thread);
 // Forced VM exit (i.e, internal error or JVM_Exit)
 extern void vm_exit(int code);
 // Wrapper for ::exit()
 extern void vm_direct_exit(int code);
 // Shutdown the VM but do not exit the process
 extern void vm_shutdown();
 // Shutdown the VM and abort the process
 extern void vm_abort(bool dump_core=true);
 // Trigger any necessary notification of the VM being shutdown
 extern void notify_vm_shutdown();
 // VM exit if error occurs during initialization of VM
 extern void vm_exit_during_initialization(Handle exception);
 extern void vm_exit_during_initialization(symbolHandle exception_name, const char* message);
 extern void vm_exit_during_initialization(const char* error, const char* message = NULL);
 extern void vm_shutdown_during_initialization(const char* error, const char* message = NULL);
 /**
  * Discovering the JDK_Version during initialization is tricky when the
  * running JDK is less than JDK6.  For JDK6 and greater, a "GetVersion"
  * function exists in libjava.so and we simply call it during the
  * 'initialize()' call to find the version.  For JDKs with version < 6, no
  * such call exists and we have to probe the JDK in order to determine
  * the exact version.  This probing cannot happen during late in
  * the VM initialization process so there's a period of time during
  * initialization when we don't know anything about the JDK version other than
  * that it less than version 6.  This is the "partially initialized" time,
  * when we can answer only certain version queries (such as, is the JDK
  * version greater than 5?  Answer: no).  Once the JDK probing occurs, we
  * know the version and are considered fully initialized.
  */
 class JDK_Version VALUE_OBJ_CLASS_SPEC {
   friend class VMStructs;
   friend class Universe;
   friend void JDK_Version_init();
  private:
   static JDK_Version _current;
   // In this class, we promote the minor version of release to be the
   // major version for releases >= 5 in anticipation of the JDK doing the
   // same thing.  For example, we represent "1.5.0" as major version 5 (we
   // drop the leading 1 and use 5 as the 'major').
   uint8_t _major;
   uint8_t _minor;
   uint8_t _micro;
   uint8_t _update;
   uint8_t _special;
   uint8_t _build;
   // If partially initialized, the above fields are invalid and we know
   // that we're less than major version 6.
   bool _partially_initialized;
   bool _thread_park_blocker;
   bool is_valid() const {
     return (_major != 0 || _partially_initialized);
   }
   // initializes or partially initializes the _current static field
   static void initialize();
   // Completes initialization for a pre-JDK6 version.
   static void fully_initialize(uint8_t major, uint8_t minor = 0,
                                uint8_t micro = 0, uint8_t update = 0);
  public:
   // Returns true if the the current version has only been partially initialized
   static bool is_partially_initialized() {
     return _current._partially_initialized;
   }
   JDK_Version() : _major(0), _minor(0), _micro(0), _update(0),
                   _special(0), _build(0), _partially_initialized(false),
                   _thread_park_blocker(false) {}
   JDK_Version(uint8_t major, uint8_t minor = 0, uint8_t micro = 0,
               uint8_t update = 0, uint8_t special = 0, uint8_t build = 0,
               bool thread_park_blocker = false) :
       _major(major), _minor(minor), _micro(micro), _update(update),
       _special(special), _build(build), _partially_initialized(false),
       _thread_park_blocker(thread_park_blocker) {}
   // Returns the current running JDK version
   static JDK_Version current() { return _current; }
   // Factory methods for convenience
   static JDK_Version jdk(uint8_t m) {
     return JDK_Version(m);
   }
   static JDK_Version jdk_update(uint8_t major, uint8_t update_number) {
     return JDK_Version(major, 0, 0, update_number);
   }
   uint8_t major_version() const          { return _major; }
   uint8_t minor_version() const          { return _minor; }
   uint8_t micro_version() const          { return _micro; }
   uint8_t update_version() const         { return _update; }
   uint8_t special_update_version() const { return _special; }
   uint8_t build_number() const           { return _build; }
   bool supports_thread_park_blocker() const {
     return _thread_park_blocker;
   }
   // Performs a full ordering comparison using all fields (update, build, etc.)
   int compare(const JDK_Version& other) const;
   /**
    * Performs comparison using only the major version, returning negative
    * if the major version of 'this' is less than the parameter, 0 if it is
    * equal, and a positive value if it is greater.
    */
   int compare_major(int version) const {
     if (_partially_initialized) {
       if (version >= 6) {
         return -1;
       } else {
         assert(false, "Can't make this comparison during init time");
         return -1; // conservative
       }
     } else {
       return major_version() - version;
     }
   }
   void to_string(char* buffer, size_t buflen) const;
   // Convenience methods for queries on the current major/minor version
   static bool is_jdk12x_version() {
     return current().compare_major(2) == 0;
   }
   static bool is_jdk13x_version() {
     return current().compare_major(3) == 0;
   }
   static bool is_jdk14x_version() {
     return current().compare_major(4) == 0;
   }
   static bool is_jdk15x_version() {
     return current().compare_major(5) == 0;
   }
   static bool is_jdk16x_version() {
     return current().compare_major(6) == 0;
   }
   static bool is_jdk17x_version() {
     return current().compare_major(7) == 0;
   }
   static bool is_gte_jdk13x_version() {
     return current().compare_major(3) >= 0;
   }
   static bool is_gte_jdk14x_version() {
     return current().compare_major(4) >= 0;
   }
   static bool is_gte_jdk15x_version() {
     return current().compare_major(5) >= 0;
   }
   static bool is_gte_jdk16x_version() {
     return current().compare_major(6) >= 0;
   }
   static bool is_gte_jdk17x_version() {
     return current().compare_major(7) >= 0;
   }
 };

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/java.hpp@2b42b31e7928 (annotated)

src/share/vm/runtime/java.hpp