folly::detail::Sleeper Class Reference

#include <Sleeper.h>

Public Member Functions
	Sleeper () noexcept
void	wait () noexcept

Static Public Member Functions
static void	sleep () noexcept

Private Attributes
uint32_t	spinCount

Static Private Attributes
static const uint32_t	kMaxActiveSpin = 4000

Detailed Description

Definition at line 39 of file Sleeper.h.

Constructor & Destructor Documentation

folly::detail::Sleeper::Sleeper ( )

inlinenoexcept

Definition at line 45 of file Sleeper.h.

: spinCount(0) {}

Member Function Documentation

static void folly::detail::Sleeper::sleep ( )

inlinestaticnoexcept

Definition at line 47 of file Sleeper.h.

Referenced by folly::detail::distributed_mutex::spin(), and wait().

                               {
    /*
     * Always sleep 0.5ms, assuming this will make the kernel put
     * us down for whatever its minimum timer resolution is (in
     * linux this varies by kernel version from 1ms to 10ms).
     */
    struct timespec ts = {0, 500000};
    nanosleep(&ts, nullptr);
  }

void folly::detail::Sleeper::wait ( )

inlinenoexcept

Definition at line 57 of file Sleeper.h.

References folly::asm_volatile_pause(), sleep(), and spinCount.

Referenced by folly::MicroSpinLock::lock(), and folly::PicoSpinLock< uintptr_t >::lock().

                       {
    if (spinCount < kMaxActiveSpin) {
      ++spinCount;
      asm_volatile_pause();
    } else {
      sleep();
    }
  }

Member Data Documentation

const uint32_t folly::detail::Sleeper::kMaxActiveSpin = 4000

staticprivate

Definition at line 40 of file Sleeper.h.

uint32_t folly::detail::Sleeper::spinCount

private

Definition at line 42 of file Sleeper.h.

Referenced by wait().

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

• proxygen/folly/folly/synchronization/detail/Sleeper.h