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comparison: js/public/SliceBudget.h
js/public/SliceBudget.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:6e04224be0f4 |
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * vim: set ts=8 sts=4 et sw=4 tw=99: | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef js_SliceBudget_h | |
| 8 #define js_SliceBudget_h | |
| 9 | |
| 10 #include <stdint.h> | |
| 11 | |
| 12 namespace js { | |
| 13 | |
| 14 /* | |
| 15 * This class records how much work has been done in a given collection slice, so that | |
| 16 * we can return before pausing for too long. Some slices are allowed to run for | |
| 17 * unlimited time, and others are bounded. To reduce the number of gettimeofday | |
| 18 * calls, we only check the time every 1000 operations. | |
| 19 */ | |
| 20 struct JS_PUBLIC_API(SliceBudget) | |
| 21 { | |
| 22 int64_t deadline; /* in microseconds */ | |
| 23 intptr_t counter; | |
| 24 | |
| 25 static const intptr_t CounterReset = 1000; | |
| 26 | |
| 27 static const int64_t Unlimited = 0; | |
| 28 static int64_t TimeBudget(int64_t millis); | |
| 29 static int64_t WorkBudget(int64_t work); | |
| 30 | |
| 31 /* Equivalent to SliceBudget(UnlimitedBudget). */ | |
| 32 SliceBudget(); | |
| 33 | |
| 34 /* Instantiate as SliceBudget(Time/WorkBudget(n)). */ | |
| 35 SliceBudget(int64_t budget); | |
| 36 | |
| 37 void reset() { | |
| 38 deadline = INT64_MAX; | |
| 39 counter = INTPTR_MAX; | |
| 40 } | |
| 41 | |
| 42 void step(intptr_t amt = 1) { | |
| 43 counter -= amt; | |
| 44 } | |
| 45 | |
| 46 bool checkOverBudget(); | |
| 47 | |
| 48 bool isOverBudget() { | |
| 49 if (counter >= 0) | |
| 50 return false; | |
| 51 return checkOverBudget(); | |
| 52 } | |
| 53 }; | |
| 54 | |
| 55 } // namespace js | |
| 56 | |
| 57 #endif /* js_SliceBudget_h */ |
