ut0mem.h

这是linux下运行的mysql软件包,可用于linux 下安装 php + mysql + apach 的网络配置

/***********************************************************************
Memory primitives

(c) 1994, 1995 Innobase Oy

Created 5/30/1994 Heikki Tuuri
************************************************************************/

#ifndef ut0mem_h
#define ut0mem_h

#include "univ.i"
#include <string.h>
#include <stdlib.h>

/* The total amount of memory currently allocated from the OS with malloc */
extern ulint	ut_total_allocated_memory;

UNIV_INLINE
void*
ut_memcpy(void* dest, const void* sour, ulint n);

UNIV_INLINE
void*
ut_memmove(void* dest, const void* sour, ulint n);

UNIV_INLINE
int
ut_memcmp(const void* str1, const void* str2, ulint n);


/**************************************************************************
Allocates memory. Sets it also to zero if UNIV_SET_MEM_TO_ZERO is
defined and set_to_zero is TRUE. */

void*
ut_malloc_low(
/*==========*/
	                     /* out, own: allocated memory */
        ulint   n,           /* in: number of bytes to allocate */
	ibool   set_to_zero, /* in: TRUE if allocated memory should be set
			     to zero if UNIV_SET_MEM_TO_ZERO is defined */
	ibool	assert_on_error); /* in: if TRUE, we crash mysqld if the memory
				cannot be allocated */
/**************************************************************************
Allocates memory. Sets it also to zero if UNIV_SET_MEM_TO_ZERO is
defined. */

void*
ut_malloc(
/*======*/
	                /* out, own: allocated memory */
        ulint   n);     /* in: number of bytes to allocate */
/**************************************************************************
Tests if malloc of n bytes would succeed. ut_malloc() asserts if memory runs
out. It cannot be used if we want to return an error message. Prints to
stderr a message if fails. */

ibool
ut_test_malloc(
/*===========*/
			/* out: TRUE if succeeded */
	ulint	n);	/* in: try to allocate this many bytes */
/**************************************************************************
Frees a memory bloock allocated with ut_malloc. */

void
ut_free(
/*====*/
	void* ptr);  /* in, own: memory block */
/**************************************************************************
Implements realloc. This is needed by /pars/lexyy.c. Otherwise, you should not
use this function because the allocation functions in mem0mem.h are the
recommended ones in InnoDB.

man realloc in Linux, 2004:

       realloc()  changes the size of the memory block pointed to
       by ptr to size bytes.  The contents will be  unchanged  to
       the minimum of the old and new sizes; newly allocated mem