hmz007
36ed224bac
Signed-off-by: hmz007 <hmz007@gmail.com> Change-Id: Ib87fdbe7a0be7dc961af3500fe9ea4589a127f9f
32 lines
1.1 KiB
C++
32 lines
1.1 KiB
C++
// 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 BASE_ALLOCATOR_PARTITION_ALLOCATOR_RANDOM_H_
|
|
#define BASE_ALLOCATOR_PARTITION_ALLOCATOR_RANDOM_H_
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "base/allocator/partition_allocator/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 // BASE_ALLOCATOR_PARTITION_ALLOCATOR_RANDOM_H_
|