1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
base / allocator / partition_allocator / src / partition_alloc / random.h [blame]
// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PARTITION_ALLOC_RANDOM_H_
#define PARTITION_ALLOC_RANDOM_H_
#include <cstdint>
#include "partition_alloc/partition_alloc_base/component_export.h"
namespace partition_alloc {
namespace internal {
// Returns a random value. The generator's internal state is initialized with
// `base::RandUint64` which is very unpredictable, but which is expensive due to
// the need to call into the kernel. Therefore this generator uses a fast,
// entirely user-space function after initialization.
PA_COMPONENT_EXPORT(PARTITION_ALLOC) uint32_t RandomValue();
} // namespace internal
// Sets the seed for the random number generator to a known value, to cause the
// RNG to generate a predictable sequence of outputs. May be called multiple
// times.
PA_COMPONENT_EXPORT(PARTITION_ALLOC) void SetMmapSeedForTesting(uint64_t seed);
} // namespace partition_alloc
#endif // PARTITION_ALLOC_RANDOM_H_