PFS_scan Struct Reference

#include <pfs_instr.h>

Public Member Functions
void	init (uint random, uint max_size)
bool	has_pass () const
void	next_pass ()
uint	first () const
uint	last () const

Detailed Description

Helper to scan circular buffers. Given a buffer of size [0, max_size - 1], and a random starting point in the buffer, this helper returns up to two [first, last -1] intervals that:

• fit into the [0, max_size - 1] range,
• have a maximum combined length of at most PFS_MAX_ALLOC_RETRY.

Definition at line 320 of file pfs_instr.h.

Member Function Documentation

uint PFS_scan::first ( ) const

inline

First index for this pass.

Definition at line 344 of file pfs_instr.h.

bool PFS_scan::has_pass ( ) const

inline

Predicate, has a next pass.

Returns

true if there is a next pass to perform.

Definition at line 334 of file pfs_instr.h.

uint PFS_scan::last ( ) const

inline

Last index for this pass.

Definition at line 348 of file pfs_instr.h.

void PFS_scan::next_pass ( )

inline

Iterator, proceed to the next pass.

Definition at line 340 of file pfs_instr.h.

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The documentation for this struct was generated from the following files:

• storage/perfschema/pfs_instr.h
• storage/perfschema/pfs_instr.cc