mirror of
https://github.com/dart-lang/sdk
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2d13b205d7
Fix transposed id and timestamp. TEST=Instruments, ci Bug: https://github.com/dart-lang/sdk/issues/49178 Change-Id: I2c2650f28050b179d26e1269729727f58201a8a8 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/251581 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Siva Annamalai <asiva@google.com>
47 lines
980 B
C++
47 lines
980 B
C++
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_RANDOM_H_
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#define RUNTIME_VM_RANDOM_H_
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#include <atomic>
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#include "vm/allocation.h"
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#include "vm/flags.h"
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#include "vm/globals.h"
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namespace dart {
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DECLARE_FLAG(uint64_t, random_seed);
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class Random {
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public:
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Random();
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// Seed must be non-zero.
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explicit Random(uint64_t seed);
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~Random();
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uint32_t NextUInt32();
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uint64_t NextUInt64() {
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return (static_cast<uint64_t>(NextUInt32()) << 32) |
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static_cast<uint64_t>(NextUInt32());
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}
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static uint64_t GlobalNextUInt64();
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static void Init();
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static void Cleanup();
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private:
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uint64_t NextState();
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void Initialize(uint64_t seed);
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std::atomic<uint64_t> _state;
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DISALLOW_COPY_AND_ASSIGN(Random);
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};
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} // namespace dart
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#endif // RUNTIME_VM_RANDOM_H_
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