ut0ut.ic File Reference

Various utilities. More...

#include <algorithm>
#include "os0thread.h"
#include "ut0dbg.h"

Namespaces
namespace	ut
	This file contains a set of libraries providing overloads for regular dynamic allocation routines which allow for opt-in memory instrumentation through performance schema memory engine (PFS).

Functions
static void	ut_pair_min (ulint *min_hi, ulint *min_lo, ulint a_hi, ulint a_lo, ulint b_hi, ulint b_lo)
	Calculate the minimum of two pairs. More...
static int	ut_ulint_cmp (ulint a, ulint b)
	Compares two ulints. More...
static int	ut_pair_cmp (ulint a_h, ulint a_l, ulint b_h, ulint b_l)
	Compare two pairs of integers. More...
constexpr ulint	ut_2_log (ulint n)
	Calculates fast the 2-logarithm of a number, rounded upward to an integer. More...
static uint32_t	ut_2_exp (uint32_t n)
	Calculates 2 to power n. More...
template<typename TCondition >
bool	ut::wait_for (TCondition cond, std::chrono::steady_clock::duration max_wait)
	Delays execution for at most max_wait or returns earlier if cond becomes true. More...
template<typename Condition >
static Wait_stats	ut::wait_for (uint64_t spins_limit, std::chrono::microseconds sleep, Condition condition={})
	Waits in loop until given condition is satisfied. More...

Detailed Description

Various utilities.

Created 5/30/1994 Heikki Tuuri

Function Documentation

ut_2_exp()

static uint32_t ut_2_exp ( uint32_t  n )

inlinestatic

Calculates 2 to power n.

Parameters

[in]

n

power of 2

Returns

2 to power n

ut_2_log()

constexpr ulint ut_2_log ( ulint  n )

constexpr

Calculates fast the 2-logarithm of a number, rounded upward to an integer.

Returns

logarithm in the base 2, rounded upward

Parameters

n	in: number != 0

ut_pair_cmp()

static int ut_pair_cmp ( ulint  a_h, ulint  a_l, ulint  b_h, ulint  b_l  )

inlinestatic

Compare two pairs of integers.

Parameters

[in]	a_h	more significant part of first pair
[in]	a_l	less significant part of first pair
[in]	b_h	more significant part of second pair
[in]	b_l	less significant part of second pair

Returns

comparison result of (a_h,a_l) and (b_h,b_l)

Return values

-1	if (a_h,a_l) is less than (b_h,b_l)
0	if (a_h,a_l) is equal to (b_h,b_l)
1	if (a_h,a_l) is greater than (b_h,b_l)

ut_pair_min()

static void ut_pair_min ( ulint *  min_hi, ulint *  min_lo, ulint  a_hi, ulint  a_lo, ulint  b_hi, ulint  b_lo  )

inlinestatic

Calculate the minimum of two pairs.

Parameters

[out]	min_hi	MSB of the minimum pair
[out]	min_lo	LSB of the minimum pair
[in]	a_hi	MSB of the first pair
[in]	a_lo	LSB of the first pair
[in]	b_hi	MSB of the second pair
[in]	b_lo	LSB of the second pair

ut_ulint_cmp()

static int ut_ulint_cmp ( ulint  a, ulint  b  )

inlinestatic

Compares two ulints.

Returns

1 if a > b, 0 if a == b, -1 if a < b

Parameters

a	in: ulint
b	in: ulint