#include "univ.i"
#include <string.h>
#include "os0sync.h"
#include "ut0mem.ic"

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Macros
#define	ut_malloc(n) ut_malloc_low(n, TRUE)

Functions
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)
UNIV_INTERN void	ut_mem_init (void)
UNIV_INTERN void *	ut_malloc_low (ulint n, ibool assert_on_error) __attribute__((malloc))
UNIV_INTERN void	ut_free (void *ptr)
UNIV_INTERN void *	ut_realloc (void *ptr, ulint size)
UNIV_INTERN void	ut_free_all_mem (void)
UNIV_INLINE char *	ut_strcpy (char dest, const char sour)
UNIV_INLINE ulint	ut_strlen (const char *str)
UNIV_INLINE int	ut_strcmp (const char str1, const char str2)
UNIV_INTERN ulint	ut_strlcpy (char dst, const char src, ulint size)
UNIV_INTERN ulint	ut_strlcpy_rev (char dst, const char src, ulint size)
UNIV_INTERN ulint	ut_strcount (const char s1, const char s2)
UNIV_INTERN char *	ut_strreplace (const char str, const char s1, const char *s2)
char *	ut_str3cat (const char s1, const char s2, const char *s3)
UNIV_INLINE ulint	ut_raw_to_hex (const void raw, ulint raw_size, char hex, ulint hex_size)
UNIV_INLINE ulint	ut_str_sql_format (const char str, ulint str_len, char buf, ulint buf_size)

Variables
ulint	ut_total_allocated_memory
os_fast_mutex_t	ut_list_mutex

Detailed Description

Memory primitives

Created 5/30/1994 Heikki Tuuri

Definition in file ut0mem.h.

Macro Definition Documentation

#define ut_malloc ( n ) ut_malloc_low(n, TRUE)

Allocates memory.

Definition at line 93 of file ut0mem.h.

Function Documentation

UNIV_INTERN void ut_free ( void * ptr )

Frees a memory block allocated with ut_malloc. Freeing a NULL pointer is a nop. in, own: memory block, can be NULL

Frees a memory block allocated with ut_malloc. Freeing a NULL pointer is a nop.

Parameters

ptr	in, own: memory block, can be NULL

Definition at line 213 of file ut0mem.cc.

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UNIV_INTERN void ut_free_all_mem ( void )

Frees in shutdown all allocated memory not freed yet.

Definition at line 329 of file ut0mem.cc.

UNIV_INTERN void* ut_malloc_low	(	ulint	n,
		ibool	assert_on_error
	)

Allocates memory.

Returns: own: allocated memory

Parameters

n	in: number of bytes to allocate
assert_on_error	in: if TRUE, we crash mysqld if the memory cannot be allocated

Definition at line 93 of file ut0mem.cc.

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UNIV_INTERN void ut_mem_init ( void )

Initializes the mem block list at database startup.

Definition at line 78 of file ut0mem.cc.

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

Wrapper for memcmp(3). Compare memory areas.

Parameters

str1	in: first memory block to compare
str2	in: second memory block to compare
n	in: number of bytes to compare

Returns: negative, 0, or positive if str1 is smaller, equal, or greater than str2, respectively.

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

Wrapper for memcpy(3).  Copy memory area when the source and

target are not overlapping.

Parameters

dest	in: copy to
sour	in: copy from
n	in: number of bytes to copy

Returns: dest

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

Wrapper for memmove(3).  Copy memory area when the source and

target are overlapping.

Parameters

dest	in: copy to
sour	in: copy from
n	in: number of bytes to copy

Returns: dest

UNIV_INLINE ulint ut_raw_to_hex	(	const void *	raw,
		ulint	raw_size,
		char *	hex,
		ulint	hex_size
	)

Converts a raw binary data to a NUL-terminated hex string. The output is truncated if there is not enough space in "hex", make sure "hex_size" is at least (2 * raw_size + 1) if you do not want this to happen. Returns the actual number of characters written to "hex" (including the NUL).

Returns: number of chars written in: "hex" size in bytes

Parameters

raw	in: raw data
raw_size	in: "raw" length in bytes
hex	out: hex string

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UNIV_INTERN void* ut_realloc	(	void *	ptr,
		ulint	size
	)

Implements realloc. This is needed by /pars/lexyy.cc. 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�
   ory will be uninitialized.  If ptr is NULL,  the  call  is
   equivalent  to malloc(size); if size is equal to zero, the
   call is equivalent to free(ptr).  Unless ptr is  NULL,  it
   must  have  been  returned by an earlier call to malloc(),
   calloc() or realloc().

RETURN VALUE realloc() returns a pointer to the newly allocated memory, which is suitably aligned for any kind of variable and may be different from ptr, or NULL if the request fails. If size was equal to 0, either NULL or a pointer suitable to be passed to free() is returned. If realloc() fails the original block is left untouched - it is not freed or moved.

Returns: own: pointer to new mem block or NULL in: desired size

Implements realloc. This is needed by /pars/lexyy.cc. 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-
   ory will be uninitialized.  If ptr is NULL,  the  call  is
   equivalent  to malloc(size); if size is equal to zero, the
   call is equivalent to free(ptr).  Unless ptr is  NULL,  it
   must  have  been  returned by an earlier call to malloc(),
   calloc() or realloc().

RETURN VALUE realloc() returns a pointer to the newly allocated memory, which is suitably aligned for any kind of variable and may be different from ptr, or NULL if the request fails. If size was equal to 0, either NULL or a pointer suitable to be passed to free() is returned. If realloc() fails the original block is left untouched - it is not freed or moved.

Returns: own: pointer to new mem block or NULL

Parameters

ptr	in: pointer to old block or NULL
size	in: desired size

Definition at line 273 of file ut0mem.cc.

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UNIV_INLINE ulint ut_str_sql_format	(	const char *	str,
		ulint	str_len,
		char *	buf,
		ulint	buf_size
	)

Adds single quotes to the start and end of string and escapes any quotes by doubling them. Returns the number of bytes that were written to "buf" (including the terminating NUL). If buf_size is too small then the trailing bytes from "str" are discarded.

Returns: number of bytes that were written in: output buffer size in bytes

Parameters

str	in: string
str_len	in: string length in bytes
buf	out: output buffer

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UNIV_INLINE int ut_strcmp	(	const char *	str1,
		const char *	str2
	)

Wrapper for strcmp(3). Compare NUL-terminated strings.

Parameters

str1	in: first string to compare
str2	in: second string to compare

Returns: negative, 0, or positive if str1 is smaller, equal, or greater than str2, respectively.

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UNIV_INTERN ulint ut_strcount	(	const char *	s1,
		const char *	s2
	)

Return the number of times s2 occurs in s1. Overlapping instances of s2 are only counted once.

Returns: the number of times s2 occurs in s1 in: string to search for

Return the number of times s2 occurs in s1. Overlapping instances of s2 are only counted once.

Returns: the number of times s2 occurs in s1

Parameters

s1	in: string to search in
s2	in: string to search for

Definition at line 415 of file ut0mem.cc.

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UNIV_INLINE char* ut_strcpy	(	char *	dest,
		const char *	sour
	)

Wrapper for strcpy(3). Copy a NUL-terminated string.

Parameters

dest	in: copy to
sour	in: copy from

Returns: dest

UNIV_INTERN ulint ut_strlcpy	(	char *	dst,
		const char *	src,
		ulint	size
	)

Copies up to size - 1 characters from the NUL-terminated string src to dst, NUL-terminating the result. Returns strlen(src), so truncation occurred if the return value >= size.

Returns: strlen(src) in: size of destination buffer

Copies up to size - 1 characters from the NUL-terminated string src to dst, NUL-terminating the result. Returns strlen(src), so truncation occurred if the return value >= size.

Returns: strlen(src)

Parameters

dst	in: destination buffer
src	in: source buffer
size	in: size of destination buffer

Definition at line 367 of file ut0mem.cc.

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UNIV_INTERN ulint ut_strlcpy_rev	(	char *	dst,
		const char *	src,
		ulint	size
	)

Like ut_strlcpy, but if src doesn't fit in dst completely, copies the last (size - 1) bytes of src, not the first.

Returns: strlen(src) in: size of destination buffer

Like ut_strlcpy, but if src doesn't fit in dst completely, copies the last (size - 1) bytes of src, not the first.

Returns: strlen(src)

Parameters

dst	in: destination buffer
src	in: source buffer
size	in: size of destination buffer

Definition at line 391 of file ut0mem.cc.

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UNIV_INLINE ulint ut_strlen ( const char * str )

Wrapper for strlen(3). Determine the length of a NUL-terminated string.

Parameters

str	in: string

Returns: length of the string in bytes, excluding the terminating NUL

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UNIV_INTERN char* ut_strreplace	(	const char *	str,
		const char *	s1,
		const char *	s2
	)

Replace every occurrence of s1 in str with s2. Overlapping instances of s1 are only replaced once.

Returns: own: modified string, must be freed with mem_free() in: string to replace s1 with

Replace every occurrence of s1 in str with s2. Overlapping instances of s1 are only replaced once.

Returns: own: modified string, must be freed with mem_free()

Parameters

str	in: string to operate on
s1	in: string to replace
s2	in: string to replace s1 with

Definition at line 476 of file ut0mem.cc.

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Variable Documentation

os_fast_mutex_t ut_list_mutex

Mutex protecting ut_total_allocated_memory and ut_mem_block_list

Definition at line 44 of file ut0mem.cc.

ulint ut_total_allocated_memory

The total amount of memory currently allocated from the operating

system with os_mem_alloc_large() or malloc(). Does not count malloc() if srv_use_sys_malloc is set. Protected by ut_list_mutex.

Definition at line 41 of file ut0mem.cc.

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

Function Documentation

Variable Documentation