Mercurial > hg > graal-compiler
annotate src/share/vm/utilities/yieldingWorkgroup.hpp @ 21814:5f07d936a14e
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Summary: Throw VerifyError for illegal accesses
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0 | 1 /* |
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2 * Copyright (c) 2005, 2013, 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" |
1972 | 29 #include "utilities/workgroup.hpp" |
0 | 30 |
31 // Forward declarations | |
32 class YieldingFlexibleWorkGang; | |
33 | |
34 // Status of tasks | |
35 enum Status { | |
36 INACTIVE, | |
37 ACTIVE, | |
38 YIELDING, | |
39 YIELDED, | |
40 ABORTING, | |
41 ABORTED, | |
42 COMPLETING, | |
43 COMPLETED | |
44 }; | |
45 | |
46 // Class YieldingFlexibleGangWorker: | |
47 // Several instances of this class run in parallel as workers for a gang. | |
48 class YieldingFlexibleGangWorker: public GangWorker { | |
49 public: | |
50 // Ctor | |
51 YieldingFlexibleGangWorker(AbstractWorkGang* gang, int id) : | |
52 GangWorker(gang, id) { } | |
53 | |
54 public: | |
55 YieldingFlexibleWorkGang* yf_gang() const | |
56 { return (YieldingFlexibleWorkGang*)gang(); } | |
57 | |
58 protected: // Override from parent class | |
59 virtual void loop(); | |
60 }; | |
61 | |
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62 class FlexibleGangTask: public AbstractGangTask { |
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63 int _actual_size; // size of gang obtained |
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64 protected: |
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65 int _requested_size; // size of gang requested |
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66 public: |
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67 FlexibleGangTask(const char* name): AbstractGangTask(name), |
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68 _requested_size(0) {} |
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69 |
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70 // The abstract work method. |
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71 // The argument tells you which member of the gang you are. |
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72 virtual void work(uint worker_id) = 0; |
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73 |
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74 int requested_size() const { return _requested_size; } |
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75 int actual_size() const { return _actual_size; } |
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76 |
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77 void set_requested_size(int sz) { _requested_size = sz; } |
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78 void set_actual_size(int sz) { _actual_size = sz; } |
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79 }; |
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80 |
0 | 81 // An abstract task to be worked on by a flexible work gang, |
82 // and where the workers will periodically yield, usually | |
83 // in response to some condition that is signalled by means | |
84 // that are specific to the task at hand. | |
85 // You subclass this to supply your own work() method. | |
86 // A second feature of this kind of work gang is that | |
87 // it allows for the signalling of certain exceptional | |
88 // conditions that may be encountered during the performance | |
89 // of the task and that may require the task at hand to be | |
90 // `aborted' forthwith. Finally, these gangs are `flexible' | |
91 // in that they can operate at partial capacity with some | |
92 // gang workers waiting on the bench; in other words, the | |
93 // size of the active worker pool can flex (up to an apriori | |
94 // maximum) in response to task requests at certain points. | |
95 // The last part (the flexible part) has not yet been fully | |
96 // fleshed out and is a work in progress. | |
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97 class YieldingFlexibleGangTask: public FlexibleGangTask { |
0 | 98 Status _status; |
99 YieldingFlexibleWorkGang* _gang; | |
100 | |
101 protected: | |
102 // Constructor and desctructor: only construct subclasses. | |
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103 YieldingFlexibleGangTask(const char* name): FlexibleGangTask(name), |
0 | 104 _status(INACTIVE), |
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105 _gang(NULL) { } |
0 | 106 |
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107 ~YieldingFlexibleGangTask() { } |
0 | 108 |
109 friend class YieldingFlexibleWorkGang; | |
110 friend class YieldingFlexibleGangWorker; | |
111 NOT_PRODUCT(virtual bool is_YieldingFlexibleGang_task() const { | |
112 return true; | |
113 }) | |
114 | |
115 void set_status(Status s) { | |
116 _status = s; | |
117 } | |
118 YieldingFlexibleWorkGang* gang() { | |
119 return _gang; | |
120 } | |
121 void set_gang(YieldingFlexibleWorkGang* gang) { | |
122 assert(_gang == NULL || gang == NULL, "Clobber without intermediate reset?"); | |
123 _gang = gang; | |
124 } | |
125 | |
126 public: | |
127 // The abstract work method. | |
128 // The argument tells you which member of the gang you are. | |
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129 virtual void work(uint worker_id) = 0; |
0 | 130 |
131 // Subclasses should call the parent's yield() method | |
132 // after having done any work specific to the subclass. | |
133 virtual void yield(); | |
134 | |
135 // An abstract method supplied by | |
136 // a concrete sub-class which is used by the coordinator | |
137 // to do any "central yielding" work. | |
138 virtual void coordinator_yield() = 0; | |
139 | |
140 // Subclasses should call the parent's abort() method | |
141 // after having done any work specific to the sunbclass. | |
142 virtual void abort(); | |
143 | |
144 Status status() const { return _status; } | |
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145 bool yielding() const { return _status == YIELDING; } |
0 | 146 bool yielded() const { return _status == YIELDED; } |
147 bool completed() const { return _status == COMPLETED; } | |
148 bool aborted() const { return _status == ABORTED; } | |
149 bool active() const { return _status == ACTIVE; } | |
150 }; | |
151 // Class YieldingWorkGang: A subclass of WorkGang. | |
152 // In particular, a YieldingWorkGang is made up of | |
153 // YieldingGangWorkers, and provides infrastructure | |
154 // supporting yielding to the "GangOverseer", | |
155 // being the thread that orchestrates the WorkGang via run_task(). | |
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156 class YieldingFlexibleWorkGang: public FlexibleWorkGang { |
0 | 157 // Here's the public interface to this class. |
158 public: | |
159 // Constructor and destructor. | |
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160 YieldingFlexibleWorkGang(const char* name, uint workers, |
342 | 161 bool are_GC_task_threads); |
0 | 162 |
163 YieldingFlexibleGangTask* yielding_task() const { | |
164 assert(task() == NULL || task()->is_YieldingFlexibleGang_task(), | |
165 "Incorrect cast"); | |
166 return (YieldingFlexibleGangTask*)task(); | |
167 } | |
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168 // Allocate a worker and return a pointer to it. |
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169 GangWorker* allocate_worker(uint which); |
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170 |
0 | 171 // Run a task; returns when the task is done, or the workers yield, |
172 // or the task is aborted, or the work gang is terminated via stop(). | |
173 // A task that has been yielded can be continued via this same interface | |
174 // by using the same task repeatedly as the argument to the call. | |
175 // It is expected that the YieldingFlexibleGangTask carries the appropriate | |
176 // continuation information used by workers to continue the task | |
177 // from its last yield point. Thus, a completed task will return | |
178 // immediately with no actual work having been done by the workers. | |
179 void run_task(AbstractGangTask* task) { | |
180 guarantee(false, "Use start_task instead"); | |
181 } | |
182 void start_task(YieldingFlexibleGangTask* new_task); | |
183 void continue_task(YieldingFlexibleGangTask* gang_task); | |
184 | |
185 // Abort a currently running task, if any; returns when all the workers | |
186 // have stopped working on the current task and have returned to their | |
187 // waiting stations. | |
188 void abort_task(); | |
189 | |
190 // Yield: workers wait at their current working stations | |
191 // until signalled to proceed by the overseer. | |
192 void yield(); | |
193 | |
194 // Abort: workers are expected to return to their waiting | |
195 // stations, whence they are ready for the next task dispatched | |
196 // by the overseer. | |
197 void abort(); | |
198 | |
199 private: | |
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200 uint _yielded_workers; |
0 | 201 void wait_for_gang(); |
202 | |
203 public: | |
204 // Accessors for fields | |
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205 uint yielded_workers() const { |
0 | 206 return _yielded_workers; |
207 } | |
208 | |
209 private: | |
210 friend class YieldingFlexibleGangWorker; | |
211 void reset(); // NYI | |
212 }; | |
1972 | 213 |
214 #endif // SHARE_VM_UTILITIES_YIELDINGWORKGROUP_HPP |