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*************************************************************************
**
** This file contains low-level memory allocation drivers for when
** SQLite will use the standard C-library malloc/realloc/free interface
** to obtain the memory it needs.
**
** This file contains implementations of the low-level memory allocation
** routines specified in the sqlite3_mem_methods object.
** routines specified in the sqlite3_mem_methods object. The content of
** this file is only used if SQLITE_SYSTEM_MALLOC is defined. The
** SQLITE_SYSTEM_MALLOC macro is defined automatically if neither the
** SQLITE_MEMDEBUG nor the SQLITE_WIN32_MALLOC macros are defined. The
** default configuration is to use memory allocation routines in this
** file.
**
** C-preprocessor macro summary:
**
** HAVE_MALLOC_USABLE_SIZE The configure script sets this symbol if
** the malloc_usable_size() interface exists
** on the target platform. Or, this symbol
** can be set manually, if desired.
** If an equivalent interface exists by
** a different name, using a separate -D
** option to rename it. This symbol will
** be enabled automatically on windows
** systems, and malloc_usable_size() will
** be redefined to _msize(), unless the
** SQLITE_WITHOUT_MSIZE macro is defined.
**
** SQLITE_WITHOUT_ZONEMALLOC Some older macs lack support for the zone
** memory allocator. Set this symbol to enable
** building on older macs.
**
** SQLITE_WITHOUT_MSIZE Set this symbol to disable the use of
** _msize() on windows systems. This might
** be necessary when compiling for Delphi,
** for example.
*/
#include "sqliteInt.h"
/*
** This version of the memory allocator is the default. It is
** used when no other memory allocator is specified using compile-time
** macros.
*/
#ifdef SQLITE_SYSTEM_MALLOC
/*
** Windows systems have malloc_usable_size() but it is called _msize()
** Windows systems have malloc_usable_size() but it is called _msize().
** The use of _msize() is automatic, but can be disabled by compiling
** with -DSQLITE_WITHOUT_MSIZE
*/
#if !defined(HAVE_MALLOC_USABLE_SIZE) && SQLITE_OS_WIN
#if !defined(HAVE_MALLOC_USABLE_SIZE) && SQLITE_OS_WIN \
&& !defined(SQLITE_WITHOUT_MSIZE)
# define HAVE_MALLOC_USABLE_SIZE 1
# define malloc_usable_size _msize
#endif
#if defined(__APPLE__)
#if defined(__APPLE__) && !defined(SQLITE_WITHOUT_ZONEMALLOC)
/*
** Use the zone allocator available on apple products
** Use the zone allocator available on apple products unless the
** SQLITE_WITHOUT_ZONEMALLOC symbol is defined.
*/
#include <sys/sysctl.h>
#include <malloc/malloc.h>
#include <libkern/OSAtomic.h>
static malloc_zone_t* _sqliteZone_;
#define SQLITE_MALLOC(x) malloc_zone_malloc(_sqliteZone_, (x))
#define SQLITE_FREE(x) malloc_zone_free(_sqliteZone_, (x));
#define SQLITE_REALLOC(x,y) malloc_zone_realloc(_sqliteZone_, (x), (y))
#define SQLITE_MALLOCSIZE(x) \
(_sqliteZone_ ? _sqliteZone_->size(_sqliteZone_,x) : malloc_size(x))
#else /* if not __APPLE__ */
/*
** Use standard C library malloc and free on non-Apple systems.
** Use standard C library malloc and free on non-Apple systems.
** Also used by Apple systems if SQLITE_WITHOUT_ZONEMALLOC is defined.
*/
#define SQLITE_MALLOC(x) malloc(x)
#define SQLITE_FREE(x) free(x)
#define SQLITE_REALLOC(x,y) realloc((x),(y))
#ifdef HAVE_MALLOC_USABLE_SIZE
#include <malloc.h>
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return ROUND8(n);
}
/*
** Initialize this module.
*/
static int sqlite3MemInit(void *NotUsed){
#if defined(__APPLE__)
#if defined(__APPLE__) && !defined(SQLITE_WITHOUT_ZONEMALLOC)
int cpuCount;
size_t len;
if( _sqliteZone_ ){
return SQLITE_OK;
}
len = sizeof(cpuCount);
/* One usually wants to use hw.acctivecpu for MT decisions, but not here */
|