mem.h

来自「T-kernel 的extension源代码」· C头文件 代码 · 共 66 行

/*
 *----------------------------------------------------------------------
 *    T-Kernel / Standard Extension
 *
 *    Copyright (C) 2006 by Ken Sakamura. All rights reserved.
 *    T-Kernel / Standard Extension is distributed 
 *      under the T-License for T-Kernel / Standard Extension.
 *----------------------------------------------------------------------
 *
 *    Version:   1.00.00
 *    Released by T-Engine Forum(http://www.t-engine.org) at 2006/8/11.
 *
 *----------------------------------------------------------------------
 */

/*
 *	mem.h (libtkse)
 *
 *	Local memory allocation library
 */

#include <basic.h>
#include <sys/memalloc.h>
#include <libstr.h>

/*
 * Minimum unit of fragmentation
 *	Since memory is allocated per unit of ROUNDSZ,
 *	Lower three bits of address are always 0.
 *	In an area queue, these bits are used as flag.
 */
#define	ROUNDSZ			( sizeof(QUEUE) )	/* 8 bytes */
#define	ROUND(sz)		( ((sz) + (ROUNDSZ - 1)) & ~(UW)(ROUNDSZ - 1) )

/* Minimum fragment size */
#define	MIN_FRAGMENT	( _mem_minfragment )

/* Maximum allocation size (for parameter check) */
#define	MAX_ALLOCATE	0x80000000U

/*
 * Flag that uses the lower bits in an area queue
 */
#define	AREA_USE		0x00000001U	/* In use */
#define	AREA_TOP		0x00000002U	/* Start of page */
#define	AREA_END		0x00000004U	/* End of page */
#define	AREA_MASK		0x00000007U

#define	setAreaFlag(q, f)	( (q)->prev = (QUEUE*)((UW)(q)->prev |  (f)) )
#define	clrAreaFlag(q, f)	( (q)->prev = (QUEUE*)((UW)(q)->prev & ~(f)) )
#define	chkAreaFlag(q, f)	( ((UW)(q)->prev & (f)) != 0 )

#define	Mask(x)			( (QUEUE*)((UW)(x) & ~(UW)AREA_MASK) )
#define	Assign(x, y)		( (x) = (QUEUE*)(((UW)(x) & AREA_MASK) | (UW)(y)) )

/*
 * Area size
 */
#define	AreaSize(aq)		( (VB*)(aq)->next - (VB*)((aq) + 1) )
#define	FreeSize(fq)		( (VB*)((fq) - 1)->next - (VB*)(fq) )

/*
 * Memory allocation check function
 */
IMPORT BOOL (*_mem_chkalloc)( void *ptr, int mode, MACB *macb );