32 friend class VMStructs;
33
34 protected:
35 bool volatile _should_terminate;
36 bool _has_terminated;
37
38 // Create and start the thread (setting it's priority high.)
39 void create_and_start();
40
41 // Do initialization steps in the thread: record stack base and size,
42 // init thread local storage, set JNI handle block.
43 void initialize_in_thread();
44
45 // Wait until Universe::is_fully_initialized();
46 void wait_for_universe_init();
47
48 // Record that the current thread is terminating, and will do more
49 // concurrent work.
50 void terminate();
51
52 public:
53 ConcurrentGCThread();
54
55 // Tester
56 bool is_ConcurrentGC_thread() const { return true; }
57 };
58
59 // The SurrogateLockerThread is used by concurrent GC threads for
60 // manipulating Java monitors, in particular, currently for
61 // manipulating the pending_list_lock. XXX
62 class SurrogateLockerThread: public JavaThread {
63 friend class VMStructs;
64 public:
65 enum SLT_msg_type {
66 empty = 0, // no message
67 acquirePLL, // acquire pending list lock
68 releaseAndNotifyPLL // notify and release pending list lock
69 };
70 private:
71 // the following are shared with the CMSThread
72 SLT_msg_type _buffer; // communication buffer
73 Monitor _monitor; // monitor controlling buffer
74 BasicLock _basicLock; // used for PLL locking
75
76 public:
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32 friend class VMStructs;
33
34 protected:
35 bool volatile _should_terminate;
36 bool _has_terminated;
37
38 // Create and start the thread (setting it's priority high.)
39 void create_and_start();
40
41 // Do initialization steps in the thread: record stack base and size,
42 // init thread local storage, set JNI handle block.
43 void initialize_in_thread();
44
45 // Wait until Universe::is_fully_initialized();
46 void wait_for_universe_init();
47
48 // Record that the current thread is terminating, and will do more
49 // concurrent work.
50 void terminate();
51
52 // Most implementations of ConcurrentGCThread use ConcurrentGCThread's termination protocol,
53 // run(), and stop() methods, and provide specific implementations of run_service() and stop_service.
54 // Otherwise run_service() and stop_service should not be called.)
55
56 // Do the specific GC work. Called by run() after initialization complete.
57 virtual void run_service() { ShouldNotReachHere(); }
58
59 // Shut down the specific GC work. Called by stop() as part of termination protocol.
60 virtual void stop_service() { ShouldNotReachHere(); }
61
62 public:
63 ConcurrentGCThread();
64
65 // Tester
66 bool is_ConcurrentGC_thread() const { return true; }
67
68 virtual void run();
69
70 // shutdown following termination protocol
71 virtual void stop();
72 };
73
74 // The SurrogateLockerThread is used by concurrent GC threads for
75 // manipulating Java monitors, in particular, currently for
76 // manipulating the pending_list_lock. XXX
77 class SurrogateLockerThread: public JavaThread {
78 friend class VMStructs;
79 public:
80 enum SLT_msg_type {
81 empty = 0, // no message
82 acquirePLL, // acquire pending list lock
83 releaseAndNotifyPLL // notify and release pending list lock
84 };
85 private:
86 // the following are shared with the CMSThread
87 SLT_msg_type _buffer; // communication buffer
88 Monitor _monitor; // monitor controlling buffer
89 BasicLock _basicLock; // used for PLL locking
90
91 public:
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