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| 1 // Copyright 2013 the V8 project authors. All rights reserved. | 1 // Copyright 2013 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "src/utils/random-number-generator.h" | 5 #include "src/base/utils/random-number-generator.h" |
| 6 | 6 |
| 7 #include <stdio.h> | 7 #include <stdio.h> |
| 8 #include <stdlib.h> | 8 #include <stdlib.h> |
| 9 | 9 |
| 10 #include <new> | 10 #include <new> |
| 11 | 11 |
| 12 #include "src/base/macros.h" | 12 #include "src/base/macros.h" |
| 13 #include "src/platform/mutex.h" | 13 #include "src/base/platform/mutex.h" |
| 14 #include "src/platform/time.h" | 14 #include "src/base/platform/time.h" |
| 15 | 15 |
| 16 namespace v8 { | 16 namespace v8 { |
| 17 namespace internal { | 17 namespace base { |
| 18 | 18 |
| 19 static LazyMutex entropy_mutex = LAZY_MUTEX_INITIALIZER; | 19 static LazyMutex entropy_mutex = LAZY_MUTEX_INITIALIZER; |
| 20 static RandomNumberGenerator::EntropySource entropy_source = NULL; | 20 static RandomNumberGenerator::EntropySource entropy_source = NULL; |
| 21 | 21 |
| 22 | 22 |
| 23 // static | 23 // static |
| 24 void RandomNumberGenerator::SetEntropySource(EntropySource source) { | 24 void RandomNumberGenerator::SetEntropySource(EntropySource source) { |
| 25 LockGuard<Mutex> lock_guard(entropy_mutex.Pointer()); | 25 LockGuard<Mutex> lock_guard(entropy_mutex.Pointer()); |
| 26 entropy_source = source; | 26 entropy_source = source; |
| 27 } | 27 } |
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| 121 int64_t seed = static_cast<int64_t>((product + kAddend) & kMask); | 121 int64_t seed = static_cast<int64_t>((product + kAddend) & kMask); |
| 122 seed_ = seed; | 122 seed_ = seed; |
| 123 return static_cast<int>(seed >> (48 - bits)); | 123 return static_cast<int>(seed >> (48 - bits)); |
| 124 } | 124 } |
| 125 | 125 |
| 126 | 126 |
| 127 void RandomNumberGenerator::SetSeed(int64_t seed) { | 127 void RandomNumberGenerator::SetSeed(int64_t seed) { |
| 128 seed_ = (seed ^ kMultiplier) & kMask; | 128 seed_ = (seed ^ kMultiplier) & kMask; |
| 129 } | 129 } |
| 130 | 130 |
| 131 } } // namespace v8::internal | 131 } } // namespace v8::base |
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