jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/concurrentGCThread.hpp@2a241e764894 (annotated)

src/share/vm/gc_implementation/shared/concurrentGCThread.hpp@2a241e764894 (annotated)

src/share/vm/gc_implementation/shared/concurrentGCThread.hpp

Fri, 10 Jun 2011 15:08:36 -0700

author: minqi
date: Fri, 10 Jun 2011 15:08:36 -0700
changeset 2964: 2a241e764894
parent 2314: f95d63e2154a
child 4542: db9981fd3124
permissions: -rw-r--r--

6941923: RFE: Handling large log files produced by long running Java Applications
Summary: supply optinal flags to realize gc log rotation
Reviewed-by: ysr, jwilhelm

 /*
  * Copyright (c) 2001, 2010, 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).
  *
  * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_CONCURRENTGCTHREAD_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_CONCURRENTGCTHREAD_HPP
 #ifndef SERIALGC
 #include "runtime/thread.hpp"
 #endif
 class VoidClosure;
 // A SuspendibleThreadSet is (obviously) a set of threads that can be
 // suspended.  A thread can join and later leave the set, and periodically
 // yield.  If some thread (not in the set) requests, via suspend_all, that
 // the threads be suspended, then the requesting thread is blocked until
 // all the threads in the set have yielded or left the set.  (Threads may
 // not enter the set when an attempted suspension is in progress.)  The
 // suspending thread later calls resume_all, allowing the suspended threads
 // to continue.
 class SuspendibleThreadSet {
   Monitor* _m;
   int      _async;
   bool     _async_stop;
   int      _async_stopped;
   bool     _initialized;
   double   _suspend_all_start;
   void initialize_work();
  public:
   SuspendibleThreadSet() : _initialized(false) {}
   // Add the current thread to the set.  May block if a suspension
   // is in progress.
   void join();
   // Removes the current thread from the set.
   void leave();
   // Returns "true" iff an suspension is in progress.
   bool should_yield() { return _async_stop; }
   // Suspends the current thread if a suspension is in progress (for
   // the duration of the suspension.)
   void yield(const char* id);
   // Return when all threads in the set are suspended.
   void suspend_all();
   // Allow suspended threads to resume.
   void resume_all();
   // Redundant initializations okay.
   void initialize() {
     // Double-check dirty read idiom.
     if (!_initialized) initialize_work();
   }
 };
 class ConcurrentGCThread: public NamedThread {
   friend class VMStructs;
 protected:
   bool _should_terminate;
   bool _has_terminated;
   enum CGC_flag_type {
     CGC_nil           = 0x0,
     CGC_dont_suspend  = 0x1,
     CGC_CGC_safepoint = 0x2,
     CGC_VM_safepoint  = 0x4
   };
   static int _CGC_flag;
   static bool CGC_flag_is_set(int b)       { return (_CGC_flag & b) != 0; }
   static int set_CGC_flag(int b)           { return _CGC_flag |= b; }
   static int reset_CGC_flag(int b)         { return _CGC_flag &= ~b; }
   // All instances share this one set.
   static SuspendibleThreadSet _sts;
   // Create and start the thread (setting it's priority high.)
   void create_and_start();
   // Do initialization steps in the thread: record stack base and size,
   // init thread local storage, set JNI handle block.
   void initialize_in_thread();
   // Wait until Universe::is_fully_initialized();
   void wait_for_universe_init();
   // Record that the current thread is terminating, and will do more
   // concurrent work.
   void terminate();
 public:
   // Constructor
   ConcurrentGCThread();
   ~ConcurrentGCThread() {} // Exists to call NamedThread destructor.
   // Tester
   bool is_ConcurrentGC_thread() const          { return true;       }
   static void safepoint_synchronize();
   static void safepoint_desynchronize();
   // All overridings should probably do _sts::yield, but we allow
   // overriding for distinguished debugging messages.  Default is to do
   // nothing.
   virtual void yield() {}
   bool should_yield() { return _sts.should_yield(); }
   // they are prefixed by sts since there are already yield() and
   // should_yield() (non-static) methods in this class and it was an
   // easy way to differentiate them.
   static void stsYield(const char* id);
   static bool stsShouldYield();
   static void stsJoin();
   static void stsLeave();
 };
 // The SurrogateLockerThread is used by concurrent GC threads for
 // manipulating Java monitors, in particular, currently for
 // manipulating the pending_list_lock. XXX
 class SurrogateLockerThread: public JavaThread {
   friend class VMStructs;
  public:
   enum SLT_msg_type {
     empty = 0,           // no message
     acquirePLL,          // acquire pending list lock
     releaseAndNotifyPLL  // notify and release pending list lock
   };
  private:
   // the following are shared with the CMSThread
   SLT_msg_type  _buffer;  // communication buffer
   Monitor       _monitor; // monitor controlling buffer
   BasicLock     _basicLock; // used for PLL locking
  public:
   static SurrogateLockerThread* make(TRAPS);
   SurrogateLockerThread();
   bool is_hidden_from_external_view() const     { return true; }
   void loop(); // main method
   void manipulatePLL(SLT_msg_type msg);
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_CONCURRENTGCTHREAD_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/shared/concurrentGCThread.hpp@2a241e764894 (annotated)

src/share/vm/gc_implementation/shared/concurrentGCThread.hpp