Mercurial > hg > truffle
annotate src/share/vm/utilities/yieldingWorkgroup.hpp @ 8071:bbc7936779f9
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Reviewed-by: ehelin, jwilhelm, jmasa
author | brutisso |
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date | Thu, 14 Feb 2013 09:11:43 +0100 |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_UTILITIES_YIELDINGWORKGROUP_HPP |
26 #define SHARE_VM_UTILITIES_YIELDINGWORKGROUP_HPP | |
27 | |
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28 #include "utilities/macros.hpp" |
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29 #if INCLUDE_ALL_GCS |
1972 | 30 #include "utilities/workgroup.hpp" |
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31 #endif // INCLUDE_ALL_GCS |
1972 | 32 |
0 | 33 |
34 // Forward declarations | |
35 class YieldingFlexibleWorkGang; | |
36 | |
37 // Status of tasks | |
38 enum Status { | |
39 INACTIVE, | |
40 ACTIVE, | |
41 YIELDING, | |
42 YIELDED, | |
43 ABORTING, | |
44 ABORTED, | |
45 COMPLETING, | |
46 COMPLETED | |
47 }; | |
48 | |
49 // Class YieldingFlexibleGangWorker: | |
50 // Several instances of this class run in parallel as workers for a gang. | |
51 class YieldingFlexibleGangWorker: public GangWorker { | |
52 public: | |
53 // Ctor | |
54 YieldingFlexibleGangWorker(AbstractWorkGang* gang, int id) : | |
55 GangWorker(gang, id) { } | |
56 | |
57 public: | |
58 YieldingFlexibleWorkGang* yf_gang() const | |
59 { return (YieldingFlexibleWorkGang*)gang(); } | |
60 | |
61 protected: // Override from parent class | |
62 virtual void loop(); | |
63 }; | |
64 | |
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65 class FlexibleGangTask: public AbstractGangTask { |
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66 int _actual_size; // size of gang obtained |
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67 protected: |
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68 int _requested_size; // size of gang requested |
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69 public: |
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70 FlexibleGangTask(const char* name): AbstractGangTask(name), |
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71 _requested_size(0) {} |
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72 |
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73 // The abstract work method. |
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74 // The argument tells you which member of the gang you are. |
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75 virtual void work(uint worker_id) = 0; |
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76 |
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77 int requested_size() const { return _requested_size; } |
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78 int actual_size() const { return _actual_size; } |
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79 |
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80 void set_requested_size(int sz) { _requested_size = sz; } |
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81 void set_actual_size(int sz) { _actual_size = sz; } |
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82 }; |
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83 |
0 | 84 // An abstract task to be worked on by a flexible work gang, |
85 // and where the workers will periodically yield, usually | |
86 // in response to some condition that is signalled by means | |
87 // that are specific to the task at hand. | |
88 // You subclass this to supply your own work() method. | |
89 // A second feature of this kind of work gang is that | |
90 // it allows for the signalling of certain exceptional | |
91 // conditions that may be encountered during the performance | |
92 // of the task and that may require the task at hand to be | |
93 // `aborted' forthwith. Finally, these gangs are `flexible' | |
94 // in that they can operate at partial capacity with some | |
95 // gang workers waiting on the bench; in other words, the | |
96 // size of the active worker pool can flex (up to an apriori | |
97 // maximum) in response to task requests at certain points. | |
98 // The last part (the flexible part) has not yet been fully | |
99 // fleshed out and is a work in progress. | |
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100 class YieldingFlexibleGangTask: public FlexibleGangTask { |
0 | 101 Status _status; |
102 YieldingFlexibleWorkGang* _gang; | |
103 | |
104 protected: | |
105 // Constructor and desctructor: only construct subclasses. | |
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106 YieldingFlexibleGangTask(const char* name): FlexibleGangTask(name), |
0 | 107 _status(INACTIVE), |
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108 _gang(NULL) { } |
0 | 109 |
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110 ~YieldingFlexibleGangTask() { } |
0 | 111 |
112 friend class YieldingFlexibleWorkGang; | |
113 friend class YieldingFlexibleGangWorker; | |
114 NOT_PRODUCT(virtual bool is_YieldingFlexibleGang_task() const { | |
115 return true; | |
116 }) | |
117 | |
118 void set_status(Status s) { | |
119 _status = s; | |
120 } | |
121 YieldingFlexibleWorkGang* gang() { | |
122 return _gang; | |
123 } | |
124 void set_gang(YieldingFlexibleWorkGang* gang) { | |
125 assert(_gang == NULL || gang == NULL, "Clobber without intermediate reset?"); | |
126 _gang = gang; | |
127 } | |
128 | |
129 public: | |
130 // The abstract work method. | |
131 // The argument tells you which member of the gang you are. | |
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132 virtual void work(uint worker_id) = 0; |
0 | 133 |
134 // Subclasses should call the parent's yield() method | |
135 // after having done any work specific to the subclass. | |
136 virtual void yield(); | |
137 | |
138 // An abstract method supplied by | |
139 // a concrete sub-class which is used by the coordinator | |
140 // to do any "central yielding" work. | |
141 virtual void coordinator_yield() = 0; | |
142 | |
143 // Subclasses should call the parent's abort() method | |
144 // after having done any work specific to the sunbclass. | |
145 virtual void abort(); | |
146 | |
147 Status status() const { return _status; } | |
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148 bool yielding() const { return _status == YIELDING; } |
0 | 149 bool yielded() const { return _status == YIELDED; } |
150 bool completed() const { return _status == COMPLETED; } | |
151 bool aborted() const { return _status == ABORTED; } | |
152 bool active() const { return _status == ACTIVE; } | |
153 }; | |
154 // Class YieldingWorkGang: A subclass of WorkGang. | |
155 // In particular, a YieldingWorkGang is made up of | |
156 // YieldingGangWorkers, and provides infrastructure | |
157 // supporting yielding to the "GangOverseer", | |
158 // being the thread that orchestrates the WorkGang via run_task(). | |
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159 class YieldingFlexibleWorkGang: public FlexibleWorkGang { |
0 | 160 // Here's the public interface to this class. |
161 public: | |
162 // Constructor and destructor. | |
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163 YieldingFlexibleWorkGang(const char* name, uint workers, |
342 | 164 bool are_GC_task_threads); |
0 | 165 |
166 YieldingFlexibleGangTask* yielding_task() const { | |
167 assert(task() == NULL || task()->is_YieldingFlexibleGang_task(), | |
168 "Incorrect cast"); | |
169 return (YieldingFlexibleGangTask*)task(); | |
170 } | |
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171 // Allocate a worker and return a pointer to it. |
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172 GangWorker* allocate_worker(uint which); |
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173 |
0 | 174 // Run a task; returns when the task is done, or the workers yield, |
175 // or the task is aborted, or the work gang is terminated via stop(). | |
176 // A task that has been yielded can be continued via this same interface | |
177 // by using the same task repeatedly as the argument to the call. | |
178 // It is expected that the YieldingFlexibleGangTask carries the appropriate | |
179 // continuation information used by workers to continue the task | |
180 // from its last yield point. Thus, a completed task will return | |
181 // immediately with no actual work having been done by the workers. | |
182 void run_task(AbstractGangTask* task) { | |
183 guarantee(false, "Use start_task instead"); | |
184 } | |
185 void start_task(YieldingFlexibleGangTask* new_task); | |
186 void continue_task(YieldingFlexibleGangTask* gang_task); | |
187 | |
188 // Abort a currently running task, if any; returns when all the workers | |
189 // have stopped working on the current task and have returned to their | |
190 // waiting stations. | |
191 void abort_task(); | |
192 | |
193 // Yield: workers wait at their current working stations | |
194 // until signalled to proceed by the overseer. | |
195 void yield(); | |
196 | |
197 // Abort: workers are expected to return to their waiting | |
198 // stations, whence they are ready for the next task dispatched | |
199 // by the overseer. | |
200 void abort(); | |
201 | |
202 private: | |
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203 uint _yielded_workers; |
0 | 204 void wait_for_gang(); |
205 | |
206 public: | |
207 // Accessors for fields | |
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208 uint yielded_workers() const { |
0 | 209 return _yielded_workers; |
210 } | |
211 | |
212 private: | |
213 friend class YieldingFlexibleGangWorker; | |
214 void reset(); // NYI | |
215 }; | |
1972 | 216 |
217 #endif // SHARE_VM_UTILITIES_YIELDINGWORKGROUP_HPP |