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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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139 }; | 139 }; |
140 | 140 |
141 | 141 |
142 // The ContextSwitcher thread is used to schedule regular preemptions to | 142 // The ContextSwitcher thread is used to schedule regular preemptions to |
143 // multiple running V8 threads. Generally it is necessary to call | 143 // multiple running V8 threads. Generally it is necessary to call |
144 // StartPreemption if there is more than one thread running. If not, a single | 144 // StartPreemption if there is more than one thread running. If not, a single |
145 // JavaScript can take full control of V8 and not allow other threads to run. | 145 // JavaScript can take full control of V8 and not allow other threads to run. |
146 class ContextSwitcher: public Thread { | 146 class ContextSwitcher: public Thread { |
147 public: | 147 public: |
148 // Set the preemption interval for the ContextSwitcher thread. | 148 // Set the preemption interval for the ContextSwitcher thread. |
149 static void StartPreemption(int every_n_ms); | 149 static void StartPreemption(Isolate* isolate, int every_n_ms); |
150 | 150 |
151 // Stop sending preemption requests to threads. | 151 // Stop sending preemption requests to threads. |
152 static void StopPreemption(); | 152 static void StopPreemption(Isolate* isolate); |
153 | 153 |
154 // Preempted thread needs to call back to the ContextSwitcher to acknowledge | 154 // Preempted thread needs to call back to the ContextSwitcher to acknowledge |
155 // the handling of a preemption request. | 155 // the handling of a preemption request. |
156 static void PreemptionReceived(); | 156 static void PreemptionReceived(); |
157 | 157 |
158 private: | 158 private: |
159 ContextSwitcher(Isolate* isolate, int every_n_ms); | 159 ContextSwitcher(Isolate* isolate, int every_n_ms); |
160 | 160 |
161 Isolate* isolate() const { return isolate_; } | 161 Isolate* isolate() const { return isolate_; } |
162 | 162 |
163 void Run(); | 163 void Run(); |
164 | 164 |
165 bool keep_going_; | 165 bool keep_going_; |
166 int sleep_ms_; | 166 int sleep_ms_; |
167 Isolate* isolate_; | 167 Isolate* isolate_; |
168 }; | 168 }; |
169 | 169 |
170 } } // namespace v8::internal | 170 } } // namespace v8::internal |
171 | 171 |
172 #endif // V8_V8THREADS_H_ | 172 #endif // V8_V8THREADS_H_ |
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