#include <stdlib.h>

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Classes
struct	st_mysql_lex_string
struct	thd_alloc_service_st

Typedefs
typedef struct st_mysql_lex_string	MYSQL_LEX_STRING

Functions
void *	thd_alloc (MYSQL_THD thd, unsigned int size)
void *	thd_calloc (MYSQL_THD thd, unsigned int size)
char *	thd_strdup (MYSQL_THD thd, const char *str)
char *	thd_strmake (MYSQL_THD thd, const char *str, unsigned int size)
void *	thd_memdup (MYSQL_THD thd, const void *str, unsigned int size)
MYSQL_LEX_STRING *	thd_make_lex_string (MYSQL_THD thd, MYSQL_LEX_STRING lex_str, const char str, unsigned int size, int allocate_lex_string)

Variables
struct thd_alloc_service_st *	thd_alloc_service

Detailed Description

This service provdes functions to allocate memory in a connection local memory pool. The memory allocated there will be automatically freed at the end of the statement, don't use it for allocations that should live longer than that. For short living allocations this is more efficient than using my_malloc and friends, and automatic "garbage collection" allows not to think about memory leaks.

The pool is best for small to medium objects, don't use it for large allocations - they are better served with my_malloc.

Definition in file service_thd_alloc.h.

Function Documentation

void* thd_alloc	(	MYSQL_THD	thd,
		unsigned int	size
	)

Allocate memory in the connection's local memory pool

When properly used in place of my_malloc(), this can significantly improve concurrency. Don't use this or related functions to allocate large chunks of memory. Use for temporary storage only. The memory will be freed automatically at the end of the statement; no explicit code is required to prevent memory leaks.

See Also: alloc_root()

Definition at line 1301 of file sql_class.cc.

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void* thd_calloc	(	MYSQL_THD	thd,
		unsigned int	size
	)

See Also: thd_alloc()

Definition at line 1307 of file sql_class.cc.

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MYSQL_LEX_STRING* thd_make_lex_string	(	MYSQL_THD	thd,
		MYSQL_LEX_STRING *	lex_str,
		const char *	str,
		unsigned int	size,
		int	allocate_lex_string
	)

Create a LEX_STRING in this connection's local memory pool

Parameters

thd	user thread connection handle
lex_str	pointer to LEX_STRING object to be initialized
str	initializer to be copied into lex_str
size	length of str, in bytes
allocate_lex_string	flag: if TRUE, allocate new LEX_STRING object, instead of using lex_str value