Mercurial > hg > graal-compiler
comparison src/share/vm/gc_implementation/shared/concurrentGCThread.hpp @ 342:37f87013dfd8
6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
author | ysr |
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date | Thu, 05 Jun 2008 15:57:56 -0700 |
parents | |
children | 315a5d70b295 |
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1 /* | |
2 * Copyright 2001-2005 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class VoidClosure; | |
26 | |
27 // A SuspendibleThreadSet is (obviously) a set of threads that can be | |
28 // suspended. A thread can join and later leave the set, and periodically | |
29 // yield. If some thread (not in the set) requests, via suspend_all, that | |
30 // the threads be suspended, then the requesting thread is blocked until | |
31 // all the threads in the set have yielded or left the set. (Threads may | |
32 // not enter the set when an attempted suspension is in progress.) The | |
33 // suspending thread later calls resume_all, allowing the suspended threads | |
34 // to continue. | |
35 | |
36 class SuspendibleThreadSet { | |
37 Monitor* _m; | |
38 int _async; | |
39 bool _async_stop; | |
40 int _async_stopped; | |
41 bool _initialized; | |
42 double _suspend_all_start; | |
43 | |
44 void initialize_work(); | |
45 | |
46 public: | |
47 SuspendibleThreadSet() : _initialized(false) {} | |
48 | |
49 // Add the current thread to the set. May block if a suspension | |
50 // is in progress. | |
51 void join(); | |
52 // Removes the current thread from the set. | |
53 void leave(); | |
54 // Returns "true" iff an suspension is in progress. | |
55 bool should_yield() { return _async_stop; } | |
56 // Suspends the current thread if a suspension is in progress (for | |
57 // the duration of the suspension.) | |
58 void yield(const char* id); | |
59 // Return when all threads in the set are suspended. | |
60 void suspend_all(); | |
61 // Allow suspended threads to resume. | |
62 void resume_all(); | |
63 // Redundant initializations okay. | |
64 void initialize() { | |
65 // Double-check dirty read idiom. | |
66 if (!_initialized) initialize_work(); | |
67 } | |
68 }; | |
69 | |
70 | |
71 class ConcurrentGCThread: public NamedThread { | |
72 friend class VMStructs; | |
73 | |
74 protected: | |
75 static bool _should_terminate; | |
76 static bool _has_terminated; | |
77 | |
78 enum CGC_flag_type { | |
79 CGC_nil = 0x0, | |
80 CGC_dont_suspend = 0x1, | |
81 CGC_CGC_safepoint = 0x2, | |
82 CGC_VM_safepoint = 0x4 | |
83 }; | |
84 | |
85 static int _CGC_flag; | |
86 | |
87 static bool CGC_flag_is_set(int b) { return (_CGC_flag & b) != 0; } | |
88 static int set_CGC_flag(int b) { return _CGC_flag |= b; } | |
89 static int reset_CGC_flag(int b) { return _CGC_flag &= ~b; } | |
90 | |
91 void stopWorldAndDo(VoidClosure* op); | |
92 | |
93 // All instances share this one set. | |
94 static SuspendibleThreadSet _sts; | |
95 | |
96 // Create and start the thread (setting it's priority high.) | |
97 void create_and_start(); | |
98 | |
99 // Do initialization steps in the thread: record stack base and size, | |
100 // init thread local storage, set JNI handle block. | |
101 void initialize_in_thread(); | |
102 | |
103 // Wait until Universe::is_fully_initialized(); | |
104 void wait_for_universe_init(); | |
105 | |
106 // Record that the current thread is terminating, and will do more | |
107 // concurrent work. | |
108 void terminate(); | |
109 | |
110 public: | |
111 // Constructor | |
112 | |
113 ConcurrentGCThread(); | |
114 ~ConcurrentGCThread() {} // Exists to call NamedThread destructor. | |
115 | |
116 // Tester | |
117 bool is_ConcurrentGC_thread() const { return true; } | |
118 | |
119 static void safepoint_synchronize(); | |
120 static void safepoint_desynchronize(); | |
121 | |
122 // All overridings should probably do _sts::yield, but we allow | |
123 // overriding for distinguished debugging messages. Default is to do | |
124 // nothing. | |
125 virtual void yield() {} | |
126 | |
127 bool should_yield() { return _sts.should_yield(); } | |
128 | |
129 // they are prefixed by sts since there are already yield() and | |
130 // should_yield() (non-static) methods in this class and it was an | |
131 // easy way to differentiate them. | |
132 static void stsYield(const char* id); | |
133 static bool stsShouldYield(); | |
134 static void stsJoin(); | |
135 static void stsLeave(); | |
136 | |
137 }; | |
138 | |
139 // The SurrogateLockerThread is used by concurrent GC threads for | |
140 // manipulating Java monitors, in particular, currently for | |
141 // manipulating the pending_list_lock. XXX | |
142 class SurrogateLockerThread: public JavaThread { | |
143 friend class VMStructs; | |
144 public: | |
145 enum SLT_msg_type { | |
146 empty = 0, // no message | |
147 acquirePLL, // acquire pending list lock | |
148 releaseAndNotifyPLL // notify and release pending list lock | |
149 }; | |
150 private: | |
151 // the following are shared with the CMSThread | |
152 SLT_msg_type _buffer; // communication buffer | |
153 Monitor _monitor; // monitor controlling buffer | |
154 BasicLock _basicLock; // used for PLL locking | |
155 | |
156 public: | |
157 static SurrogateLockerThread* make(TRAPS); | |
158 | |
159 SurrogateLockerThread(); | |
160 | |
161 bool is_hidden_from_external_view() const { return true; } | |
162 | |
163 void loop(); // main method | |
164 | |
165 void manipulatePLL(SLT_msg_type msg); | |
166 | |
167 }; |