folly::AccessSpreader< Atom >::CpuCache Class Reference

Caches the current CPU and refreshes the cache every so often. More...

Public Member Functions
unsigned	cpu ()

Private Attributes
unsigned	cachedCpu_ {0}
unsigned	cachedCpuUses_ {0}

Static Private Attributes
static constexpr unsigned	kMaxCachedCpuUses = 32

Detailed Description

template<template< typename > class Atom = std::atomic>
class folly::AccessSpreader< Atom >::CpuCache

Caches the current CPU and refreshes the cache every so often.

Definition at line 289 of file CacheLocality.h.

Member Function Documentation

template<template< typename > class Atom = std::atomic>

unsigned folly::AccessSpreader< Atom >::CpuCache::cpu ( )

inline

Definition at line 291 of file CacheLocality.h.

References folly::AccessSpreader< Atom >::getcpuFunc, and UNLIKELY.

                   {
      if (UNLIKELY(cachedCpuUses_-- == 0)) {
        unsigned cpu;
        AccessSpreader::getcpuFunc(&cpu, nullptr, nullptr);
        cachedCpu_ = cpu % kMaxCpus;
        cachedCpuUses_ = kMaxCachedCpuUses - 1;
      }
      return cachedCpu_;
    }

Member Data Documentation

template<template< typename > class Atom = std::atomic>

unsigned folly::AccessSpreader< Atom >::CpuCache::cachedCpu_ {0}

private

Definition at line 304 of file CacheLocality.h.

template<template< typename > class Atom = std::atomic>

unsigned folly::AccessSpreader< Atom >::CpuCache::cachedCpuUses_ {0}

private

Definition at line 305 of file CacheLocality.h.

template<template< typename > class Atom = std::atomic>

constexpr unsigned folly::AccessSpreader< Atom >::CpuCache::kMaxCachedCpuUses = 32

staticprivate

Definition at line 302 of file CacheLocality.h.

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The documentation for this class was generated from the following file:

• proxygen/folly/folly/concurrency/CacheLocality.h