Zach Anderson
d7df61e042
This reverts commit 7fe44864d6.
Reason for revert: https://github.com/flutter/flutter/issues/106957
Original change's description:
> [vm] Generate event ids for synchronous begin and end events.
>
> os_signposts needs explicit ids to match begin and end events, whereas all other trace systems do this implicitly.
>
> TEST=Instruments
> Bug: https://github.com/dart-lang/sdk/issues/49178
> Change-Id: Ifeeaa1dfe823a0d5668f48b8c584f8bdeef23212
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/249951
> Reviewed-by: Siva Annamalai <asiva@google.com>
> Commit-Queue: Ryan Macnak <rmacnak@google.com>
TBR=rmacnak@google.com,asiva@google.com
Change-Id: Id86959d08b5352b5446b6f294a8302b88b4fa0c8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: https://github.com/dart-lang/sdk/issues/49178
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/250403
Reviewed-by: Zach Anderson <zra@google.com>
Commit-Queue: Liam Appelbe <liama@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>
Reviewed-by: Liam Appelbe <liama@google.com>
43 lines
894 B
C++
43 lines
894 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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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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