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CoOS/kernel/kernelHeap.c@0:94897d537b31, 2011-09-10 (annotated)

Committer:: astroboy
Date:: Sat Sep 10 22:41:10 2011 +0000
Revision:: 0:94897d537b31

Who changed what in which revision?

User	Revision	Line number	New contents of line
astroboy	0:94897d537b31	1	/**
astroboy	0:94897d537b31	2	*******************************************************************************
astroboy	0:94897d537b31	3	* @file kernelHeap.c
astroboy	0:94897d537b31	4	* @version V1.1.4
astroboy	0:94897d537b31	5	* @date 2011.04.20
astroboy	0:94897d537b31	6	* @brief kernel heap management implementation code of CooCox CoOS kernel.
astroboy	0:94897d537b31	7	*******************************************************************************
astroboy	0:94897d537b31	8	* @copy
astroboy	0:94897d537b31	9	*
astroboy	0:94897d537b31	10	* INTERNAL FILE,DON'T PUBLIC.
astroboy	0:94897d537b31	11	*
astroboy	0:94897d537b31	12	* <h2><center>© COPYRIGHT 2009 CooCox </center></h2>
astroboy	0:94897d537b31	13	*******************************************************************************
astroboy	0:94897d537b31	14	*/
astroboy	0:94897d537b31	15
astroboy	0:94897d537b31	16
astroboy	0:94897d537b31	17	/---------------------------- Include ---------------------------------------/
astroboy	0:94897d537b31	18	#include <coocox.h>
astroboy	0:94897d537b31	19
astroboy	0:94897d537b31	20
astroboy	0:94897d537b31	21	#if CFG_KHEAP_EN >0
astroboy	0:94897d537b31	22	/---------------------------- Variable Define -------------------------------/
astroboy	0:94897d537b31	23	U32 KernelHeap[KHEAP_SIZE] = {0}; /!< Kernel heap /
astroboy	0:94897d537b31	24	P_FMB FMBlist = Co_NULL; /!< Free memory block list /
astroboy	0:94897d537b31	25	KHeap Kheap = {0}; /!< Kernel heap control /
astroboy	0:94897d537b31	26
astroboy	0:94897d537b31	27
astroboy	0:94897d537b31	28	/---------------------------- Function Declare ------------------------------/
astroboy	0:94897d537b31	29	static P_FMB GetPreFMB(P_UMB usedMB);
astroboy	0:94897d537b31	30	/**
astroboy	0:94897d537b31	31	*******************************************************************************
astroboy	0:94897d537b31	32	* @brief Create kernel heap
astroboy	0:94897d537b31	33	* @param[in] None
astroboy	0:94897d537b31	34	* @param[out] None
astroboy	0:94897d537b31	35	* @retval None
astroboy	0:94897d537b31	36	*
astroboy	0:94897d537b31	37	* @par Description
astroboy	0:94897d537b31	38	* @details This function is called to create kernel heap.
astroboy	0:94897d537b31	39	*******************************************************************************
astroboy	0:94897d537b31	40	*/
astroboy	0:94897d537b31	41	void CoCreateKheap(void)
astroboy	0:94897d537b31	42	{
astroboy	0:94897d537b31	43	Kheap.startAddr = (U32)(KernelHeap); /* Initialize kernel heap control */
astroboy	0:94897d537b31	44	Kheap.endAddr = (U32)(KernelHeap) + KHEAP_SIZE*4;
astroboy	0:94897d537b31	45	FMBlist = (P_FMB)KernelHeap; /* Initialize free memory block list*/
astroboy	0:94897d537b31	46	FMBlist->nextFMB = Co_NULL;
astroboy	0:94897d537b31	47	FMBlist->nextUMB = Co_NULL;
astroboy	0:94897d537b31	48	FMBlist->preUMB = Co_NULL;
astroboy	0:94897d537b31	49	}
astroboy	0:94897d537b31	50
astroboy	0:94897d537b31	51
astroboy	0:94897d537b31	52	/**
astroboy	0:94897d537b31	53	*******************************************************************************
astroboy	0:94897d537b31	54	* @brief Allocation size bytes of memory block from kernel heap.
astroboy	0:94897d537b31	55	* @param[in] size Length of menory block.
astroboy	0:94897d537b31	56	* @param[out] None
astroboy	0:94897d537b31	57	* @retval Co_NULL Allocate fail.
astroboy	0:94897d537b31	58	* @retval others Pointer to memory block.
astroboy	0:94897d537b31	59	*
astroboy	0:94897d537b31	60	* @par Description
astroboy	0:94897d537b31	61	* @details This function is called to allocation size bytes of memory block.
astroboy	0:94897d537b31	62	*******************************************************************************
astroboy	0:94897d537b31	63	*/
astroboy	0:94897d537b31	64	void* CoKmalloc(U32 size)
astroboy	0:94897d537b31	65	{
astroboy	0:94897d537b31	66	P_FMB freeMB,newFMB,preFMB;
astroboy	0:94897d537b31	67	P_UMB usedMB,tmpUMB;
astroboy	0:94897d537b31	68	U8* memAddr;
astroboy	0:94897d537b31	69	U32 freeSize;
astroboy	0:94897d537b31	70	U32 kheapAddr;
astroboy	0:94897d537b31	71
astroboy	0:94897d537b31	72	#if CFG_PAR_CHECKOUT_EN >0 /* Check validity of parameter */
astroboy	0:94897d537b31	73	if( size == 0 )
astroboy	0:94897d537b31	74	{
astroboy	0:94897d537b31	75	return Co_NULL;
astroboy	0:94897d537b31	76	}
astroboy	0:94897d537b31	77	#endif
astroboy	0:94897d537b31	78
astroboy	0:94897d537b31	79	/* Word alignment,and add used memory head size */
astroboy	0:94897d537b31	80	size = (((size+3)>>2)<<2) + 8;
astroboy	0:94897d537b31	81	kheapAddr = Kheap.endAddr; /* Get the end address of kernel heap */
astroboy	0:94897d537b31	82	OsSchedLock(); /* Lock schedule */
astroboy	0:94897d537b31	83	freeMB = FMBlist; /* Get first item of free memory list */
astroboy	0:94897d537b31	84	preFMB = Co_NULL;
astroboy	0:94897d537b31	85	while(freeMB != Co_NULL ) /* Is out of free memory list? */
astroboy	0:94897d537b31	86	{ /* No */
astroboy	0:94897d537b31	87	if(freeMB->nextUMB == Co_NULL) /* Is last item of free memory list? */
astroboy	0:94897d537b31	88	{ /* Yes,get size for this free item */
astroboy	0:94897d537b31	89	freeSize = kheapAddr - (U32)(freeMB);
astroboy	0:94897d537b31	90	}
astroboy	0:94897d537b31	91	else /* No,get size for this free item */
astroboy	0:94897d537b31	92	{
astroboy	0:94897d537b31	93	freeSize = (U32)(freeMB->nextUMB) -1 - (U32)(freeMB);
astroboy	0:94897d537b31	94	}
astroboy	0:94897d537b31	95	if(freeSize >= size) /* If the size equal or greater than need */
astroboy	0:94897d537b31	96	{ /* Yes,assign in this free memory */
astroboy	0:94897d537b31	97	usedMB=(P_UMB)freeMB;/* Get the address for used memory block head*/
astroboy	0:94897d537b31	98
astroboy	0:94897d537b31	99	/* Get the address for used memory block */
astroboy	0:94897d537b31	100	memAddr = (U8*)((U32)(usedMB) + 8);
astroboy	0:94897d537b31	101
astroboy	0:94897d537b31	102	/* Is left size of free memory smaller than 12? */
astroboy	0:94897d537b31	103	if((freeSize-size) < 12)
astroboy	0:94897d537b31	104	{
astroboy	0:94897d537b31	105	/* Yes,malloc together(12 is the size of the header information
astroboy	0:94897d537b31	106	of free memory block ). */
astroboy	0:94897d537b31	107	if(preFMB != Co_NULL)/* Is first item of free memory block list? */
astroboy	0:94897d537b31	108	{ /* No,set the link for list */
astroboy	0:94897d537b31	109	preFMB->nextFMB = freeMB->nextFMB;
astroboy	0:94897d537b31	110	}
astroboy	0:94897d537b31	111	else /* Yes,reset the first item */
astroboy	0:94897d537b31	112	{
astroboy	0:94897d537b31	113	FMBlist = freeMB->nextFMB;
astroboy	0:94897d537b31	114	}
astroboy	0:94897d537b31	115
astroboy	0:94897d537b31	116	if(freeMB->nextUMB != Co_NULL) /* Is last item? */
astroboy	0:94897d537b31	117	{ /* No,set the link for list */
astroboy	0:94897d537b31	118	tmpUMB = (P_UMB)((U32)(freeMB->nextUMB)-1);
astroboy	0:94897d537b31	119	tmpUMB->preMB = (void*)((U32)usedMB\|0x1);
astroboy	0:94897d537b31	120	}
astroboy	0:94897d537b31	121
astroboy	0:94897d537b31	122	usedMB->nextMB = freeMB->nextUMB;/* Set used memory block link*/
astroboy	0:94897d537b31	123	usedMB->preMB = freeMB->preUMB;
astroboy	0:94897d537b31	124	}
astroboy	0:94897d537b31	125	else /* No,the left size more than 12 */
astroboy	0:94897d537b31	126	{
astroboy	0:94897d537b31	127	/* Get new free memory block address */
astroboy	0:94897d537b31	128	newFMB = (P_FMB)((U32)(freeMB) + size);
astroboy	0:94897d537b31	129
astroboy	0:94897d537b31	130	if(preFMB != Co_NULL)/* Is first item of free memory block list? */
astroboy	0:94897d537b31	131	{
astroboy	0:94897d537b31	132	preFMB->nextFMB = newFMB; /* No,set the link for list */
astroboy	0:94897d537b31	133	}
astroboy	0:94897d537b31	134	else
astroboy	0:94897d537b31	135	{
astroboy	0:94897d537b31	136	FMBlist = newFMB; /* Yes,reset the first item */
astroboy	0:94897d537b31	137	}
astroboy	0:94897d537b31	138
astroboy	0:94897d537b31	139	/* Set link for new free memory block */
astroboy	0:94897d537b31	140	newFMB->preUMB = (P_UMB)((U32)usedMB\|0x1);
astroboy	0:94897d537b31	141	newFMB->nextUMB = freeMB->nextUMB;
astroboy	0:94897d537b31	142	newFMB->nextFMB = freeMB->nextFMB;
astroboy	0:94897d537b31	143
astroboy	0:94897d537b31	144	if(freeMB->nextUMB != Co_NULL) /* Is last item? */
astroboy	0:94897d537b31	145	{ /* No,set the link for list */
astroboy	0:94897d537b31	146	tmpUMB = (P_UMB)((U32)(freeMB->nextUMB)-1);
astroboy	0:94897d537b31	147	tmpUMB->preMB = newFMB;
astroboy	0:94897d537b31	148	}
astroboy	0:94897d537b31	149
astroboy	0:94897d537b31	150	usedMB->nextMB = newFMB; /* Set used memory block link */
astroboy	0:94897d537b31	151	usedMB->preMB = freeMB->preUMB;
astroboy	0:94897d537b31	152	}
astroboy	0:94897d537b31	153
astroboy	0:94897d537b31	154	if(freeMB->preUMB != Co_NULL) /* Is first item? */
astroboy	0:94897d537b31	155	{ /* No,set the link for list */
astroboy	0:94897d537b31	156	tmpUMB = (P_UMB)((U32)(freeMB->preUMB)-1);
astroboy	0:94897d537b31	157	tmpUMB->nextMB = (void*)((U32)usedMB\|0x1);
astroboy	0:94897d537b31	158	}
astroboy	0:94897d537b31	159
astroboy	0:94897d537b31	160	OsSchedUnlock(); /* Unlock schedule */
astroboy	0:94897d537b31	161	return memAddr; /* Return used memory block address */
astroboy	0:94897d537b31	162	}
astroboy	0:94897d537b31	163	preFMB = freeMB; /* Save current free memory block as previous */
astroboy	0:94897d537b31	164	freeMB = freeMB->nextFMB; /* Get the next item as current item*/
astroboy	0:94897d537b31	165	}
astroboy	0:94897d537b31	166	OsSchedUnlock(); /* Unlock schedule */
astroboy	0:94897d537b31	167	return Co_NULL; /* Error return */
astroboy	0:94897d537b31	168	}
astroboy	0:94897d537b31	169
astroboy	0:94897d537b31	170
astroboy	0:94897d537b31	171	/**
astroboy	0:94897d537b31	172	*******************************************************************************
astroboy	0:94897d537b31	173	* @brief Release memory block to kernel heap.
astroboy	0:94897d537b31	174	* @param[in] memBuf Pointer to memory block.
astroboy	0:94897d537b31	175	* @param[out] None
astroboy	0:94897d537b31	176	* @retval None
astroboy	0:94897d537b31	177	*
astroboy	0:94897d537b31	178	* @par Description
astroboy	0:94897d537b31	179	* @details This function is called to release memory block.
astroboy	0:94897d537b31	180	*******************************************************************************
astroboy	0:94897d537b31	181	*/
astroboy	0:94897d537b31	182	void CoKfree(void* memBuf)
astroboy	0:94897d537b31	183	{
astroboy	0:94897d537b31	184	P_FMB curFMB,nextFMB,preFMB;
astroboy	0:94897d537b31	185	P_UMB usedMB,nextUMB,preUMB;
astroboy	0:94897d537b31	186
astroboy	0:94897d537b31	187	#if CFG_PAR_CHECKOUT_EN >0 /* Check validity of parameter */
astroboy	0:94897d537b31	188	if(memBuf == Co_NULL)
astroboy	0:94897d537b31	189	{
astroboy	0:94897d537b31	190	return;
astroboy	0:94897d537b31	191	}
astroboy	0:94897d537b31	192	#endif
astroboy	0:94897d537b31	193
astroboy	0:94897d537b31	194	usedMB = (P_UMB)((U32)(memBuf)-8);
astroboy	0:94897d537b31	195
astroboy	0:94897d537b31	196	#if CFG_PAR_CHECKOUT_EN >0 /* Check validity of parameter */
astroboy	0:94897d537b31	197	if((U32)(memBuf) < Kheap.startAddr)
astroboy	0:94897d537b31	198	{
astroboy	0:94897d537b31	199	return;
astroboy	0:94897d537b31	200	}
astroboy	0:94897d537b31	201	if((U32)(memBuf) > Kheap.endAddr)
astroboy	0:94897d537b31	202	{
astroboy	0:94897d537b31	203	return;
astroboy	0:94897d537b31	204	}
astroboy	0:94897d537b31	205	#endif
astroboy	0:94897d537b31	206
astroboy	0:94897d537b31	207
astroboy	0:94897d537b31	208	OsSchedLock(); /* Lock schedule */
astroboy	0:94897d537b31	209
astroboy	0:94897d537b31	210	#if CFG_PAR_CHECKOUT_EN >0 /* Check UMB in list */
astroboy	0:94897d537b31	211	if((U32)(usedMB) < (U32)(FMBlist))
astroboy	0:94897d537b31	212	{
astroboy	0:94897d537b31	213	preUMB = (P_UMB)((U32)(FMBlist->preUMB)-1);
astroboy	0:94897d537b31	214	while(preUMB != usedMB)
astroboy	0:94897d537b31	215	{
astroboy	0:94897d537b31	216	if(preUMB == Co_NULL)
astroboy	0:94897d537b31	217	{
astroboy	0:94897d537b31	218	OsSchedUnlock();
astroboy	0:94897d537b31	219	return;
astroboy	0:94897d537b31	220	}
astroboy	0:94897d537b31	221	preUMB = (P_UMB)((U32)(preUMB->preMB)-1);
astroboy	0:94897d537b31	222	}
astroboy	0:94897d537b31	223	}
astroboy	0:94897d537b31	224	else
astroboy	0:94897d537b31	225	{
astroboy	0:94897d537b31	226	if(FMBlist == Co_NULL)
astroboy	0:94897d537b31	227	{
astroboy	0:94897d537b31	228	nextUMB = (P_UMB)(Kheap.startAddr);
astroboy	0:94897d537b31	229	}
astroboy	0:94897d537b31	230	else
astroboy	0:94897d537b31	231	{
astroboy	0:94897d537b31	232	if(FMBlist->nextUMB != Co_NULL)
astroboy	0:94897d537b31	233	{
astroboy	0:94897d537b31	234	nextUMB = (P_UMB)((U32)(FMBlist->nextUMB)-1);
astroboy	0:94897d537b31	235	}
astroboy	0:94897d537b31	236	else
astroboy	0:94897d537b31	237	{
astroboy	0:94897d537b31	238	nextUMB = Co_NULL;
astroboy	0:94897d537b31	239	}
astroboy	0:94897d537b31	240	}
astroboy	0:94897d537b31	241
astroboy	0:94897d537b31	242	while(nextUMB != usedMB)
astroboy	0:94897d537b31	243	{
astroboy	0:94897d537b31	244	if(nextUMB == Co_NULL)
astroboy	0:94897d537b31	245	{
astroboy	0:94897d537b31	246	OsSchedUnlock();
astroboy	0:94897d537b31	247	return;
astroboy	0:94897d537b31	248	}
astroboy	0:94897d537b31	249	if(((U32)(nextUMB->nextMB)&0x1) == 0)
astroboy	0:94897d537b31	250	{
astroboy	0:94897d537b31	251	nextFMB = (P_FMB)(nextUMB->nextMB);
astroboy	0:94897d537b31	252	nextUMB = (P_UMB)((U32)(nextFMB->nextUMB)-1);
astroboy	0:94897d537b31	253	}
astroboy	0:94897d537b31	254	else
astroboy	0:94897d537b31	255	{
astroboy	0:94897d537b31	256	nextUMB = (P_UMB)((U32)(nextUMB->nextMB)-1);
astroboy	0:94897d537b31	257	}
astroboy	0:94897d537b31	258	}
astroboy	0:94897d537b31	259	}
astroboy	0:94897d537b31	260	#endif
astroboy	0:94897d537b31	261
astroboy	0:94897d537b31	262
astroboy	0:94897d537b31	263	/* Is between two free memory block? */
astroboy	0:94897d537b31	264	if( (((U32)(usedMB->nextMB)&0x1) == 0) && (((U32)(usedMB->preMB)&0x1)==0) )
astroboy	0:94897d537b31	265	{ /* Yes,is the only one item in kernel heap? */
astroboy	0:94897d537b31	266	if((usedMB->nextMB == Co_NULL) && (usedMB->preMB == Co_NULL))
astroboy	0:94897d537b31	267	{
astroboy	0:94897d537b31	268	curFMB = (P_FMB)usedMB; /* Yes,release this item */
astroboy	0:94897d537b31	269	curFMB->nextFMB = Co_NULL;
astroboy	0:94897d537b31	270	curFMB->nextUMB = Co_NULL;
astroboy	0:94897d537b31	271	curFMB->preUMB = Co_NULL;
astroboy	0:94897d537b31	272	FMBlist = curFMB;
astroboy	0:94897d537b31	273	}
astroboy	0:94897d537b31	274	else if(usedMB->preMB == Co_NULL) /* Is the first item in kernel heap */
astroboy	0:94897d537b31	275	{
astroboy	0:94897d537b31	276	/* Yes,release this item,and set link for list */
astroboy	0:94897d537b31	277	curFMB = (P_FMB)usedMB;
astroboy	0:94897d537b31	278	nextFMB = (P_FMB)usedMB->nextMB;
astroboy	0:94897d537b31	279
astroboy	0:94897d537b31	280	curFMB->nextFMB = nextFMB->nextFMB;
astroboy	0:94897d537b31	281	curFMB->nextUMB = nextFMB->nextUMB;
astroboy	0:94897d537b31	282	curFMB->preUMB = Co_NULL;
astroboy	0:94897d537b31	283	FMBlist = curFMB;
astroboy	0:94897d537b31	284	}
astroboy	0:94897d537b31	285	else if(usedMB->nextMB == Co_NULL) /* Is the last item in kernel heap */
astroboy	0:94897d537b31	286	{ /* Yes,release this item,and set link for list */
astroboy	0:94897d537b31	287	curFMB = (P_FMB)(usedMB->preMB);
astroboy	0:94897d537b31	288	curFMB->nextFMB = Co_NULL;
astroboy	0:94897d537b31	289	curFMB->nextUMB = Co_NULL;
astroboy	0:94897d537b31	290	}
astroboy	0:94897d537b31	291	else /* All no,show this item between two normal FMB */
astroboy	0:94897d537b31	292	{
astroboy	0:94897d537b31	293	/* release this item,and set link for list */
astroboy	0:94897d537b31	294	nextFMB = (P_FMB)usedMB->nextMB;
astroboy	0:94897d537b31	295	curFMB = (P_FMB)(usedMB->preMB);
astroboy	0:94897d537b31	296
astroboy	0:94897d537b31	297	curFMB->nextFMB = nextFMB->nextFMB;
astroboy	0:94897d537b31	298	curFMB->nextUMB = nextFMB->nextUMB;
astroboy	0:94897d537b31	299	}
astroboy	0:94897d537b31	300	}
astroboy	0:94897d537b31	301	else if(((U32)(usedMB->preMB)&0x1) == 0) /* Is between FMB and UMB? */
astroboy	0:94897d537b31	302	{
astroboy	0:94897d537b31	303	if(usedMB->preMB == Co_NULL) /* Yes,is the first item in kernel heap? */
astroboy	0:94897d537b31	304	{
astroboy	0:94897d537b31	305	/* Yes,release this item,and set link for list */
astroboy	0:94897d537b31	306	curFMB = (P_FMB)usedMB;
astroboy	0:94897d537b31	307	nextUMB = (P_UMB)usedMB->nextMB;
astroboy	0:94897d537b31	308	curFMB->nextUMB = nextUMB;
astroboy	0:94897d537b31	309	curFMB->preUMB = Co_NULL;
astroboy	0:94897d537b31	310	curFMB->nextFMB = FMBlist;
astroboy	0:94897d537b31	311	FMBlist = curFMB;
astroboy	0:94897d537b31	312	}
astroboy	0:94897d537b31	313	else /* No,release this item,and set link for list */
astroboy	0:94897d537b31	314	{
astroboy	0:94897d537b31	315	curFMB = (P_FMB)usedMB->preMB;
astroboy	0:94897d537b31	316	nextUMB = (P_UMB)usedMB->nextMB;
astroboy	0:94897d537b31	317	curFMB->nextUMB = nextUMB;
astroboy	0:94897d537b31	318	}
astroboy	0:94897d537b31	319
astroboy	0:94897d537b31	320	}
astroboy	0:94897d537b31	321	else if(((U32)(usedMB->nextMB)&0x1) == 0) /* Is between UMB and FMB? */
astroboy	0:94897d537b31	322	{ /* Yes */
astroboy	0:94897d537b31	323	preUMB = (P_UMB)(usedMB->preMB); /* Get previous UMB */
astroboy	0:94897d537b31	324	curFMB = (P_FMB)(usedMB); /* new FMB */
astroboy	0:94897d537b31	325	preFMB = GetPreFMB(usedMB); /* Get previous FMB */
astroboy	0:94897d537b31	326	if(preFMB == Co_NULL) /* Is previous FMB==Co_NULL? */
astroboy	0:94897d537b31	327	{
astroboy	0:94897d537b31	328	nextFMB = FMBlist; /* Yes,get next FMB */
astroboy	0:94897d537b31	329	FMBlist = curFMB; /* Reset new FMB as the first item of FMB list*/
astroboy	0:94897d537b31	330	}
astroboy	0:94897d537b31	331	else
astroboy	0:94897d537b31	332	{
astroboy	0:94897d537b31	333	nextFMB = preFMB->nextFMB; /* No,get next FMB */
astroboy	0:94897d537b31	334	preFMB->nextFMB = curFMB; /* Set link for FMB list */
astroboy	0:94897d537b31	335	}
astroboy	0:94897d537b31	336
astroboy	0:94897d537b31	337	if(nextFMB == Co_NULL) /* Is new FMB as last item of FMB list? */
astroboy	0:94897d537b31	338	{
astroboy	0:94897d537b31	339	curFMB->preUMB = preUMB; /* Yes,set link for list */
astroboy	0:94897d537b31	340	curFMB->nextUMB = Co_NULL;
astroboy	0:94897d537b31	341	curFMB->nextFMB = Co_NULL;
astroboy	0:94897d537b31	342	}
astroboy	0:94897d537b31	343	else
astroboy	0:94897d537b31	344	{
astroboy	0:94897d537b31	345	curFMB->preUMB = preUMB; /* No,set link for list */
astroboy	0:94897d537b31	346	curFMB->nextUMB = nextFMB->nextUMB;
astroboy	0:94897d537b31	347	curFMB->nextFMB = nextFMB->nextFMB;
astroboy	0:94897d537b31	348	}
astroboy	0:94897d537b31	349	}
astroboy	0:94897d537b31	350	else /* All no,show UMB between two UMB*/
astroboy	0:94897d537b31	351	{
astroboy	0:94897d537b31	352	curFMB = (P_FMB)(usedMB); /* new FMB */
astroboy	0:94897d537b31	353	preFMB = GetPreFMB(usedMB); /* Get previous FMB */
astroboy	0:94897d537b31	354	preUMB = (P_UMB)(usedMB->preMB); /* Get previous UMB */
astroboy	0:94897d537b31	355	nextUMB = (P_UMB)(usedMB->nextMB); /* Get next UMB */
astroboy	0:94897d537b31	356
astroboy	0:94897d537b31	357	if(preFMB == Co_NULL ) /* Is previous FMB==Co_NULL? */
astroboy	0:94897d537b31	358	{
astroboy	0:94897d537b31	359	nextFMB = FMBlist; /* Yes,get next FMB */
astroboy	0:94897d537b31	360	FMBlist = curFMB; /* Reset new FMB as the first item of FMB list */
astroboy	0:94897d537b31	361	}
astroboy	0:94897d537b31	362	else
astroboy	0:94897d537b31	363	{
astroboy	0:94897d537b31	364	nextFMB = preFMB->nextFMB; /* No,get next FMB */
astroboy	0:94897d537b31	365	preFMB->nextFMB = curFMB; /* Set link for FMB list */
astroboy	0:94897d537b31	366	}
astroboy	0:94897d537b31	367
astroboy	0:94897d537b31	368	curFMB->preUMB = preUMB; /* Set current FMB link for list */
astroboy	0:94897d537b31	369	curFMB->nextUMB = nextUMB;
astroboy	0:94897d537b31	370	curFMB->nextFMB = nextFMB;
astroboy	0:94897d537b31	371	}
astroboy	0:94897d537b31	372
astroboy	0:94897d537b31	373	if(curFMB->preUMB != Co_NULL)/* Is current FMB as first item in kernel heap? */
astroboy	0:94897d537b31	374	{ /* No,set link for list */
astroboy	0:94897d537b31	375	preUMB = (P_UMB)((U32)(curFMB->preUMB)-1);
astroboy	0:94897d537b31	376	preUMB->nextMB = (void*)curFMB;
astroboy	0:94897d537b31	377	}
astroboy	0:94897d537b31	378	if(curFMB->nextUMB != Co_NULL)/* Is current FMB as last item in kernel heap? */
astroboy	0:94897d537b31	379	{ /* No,set link for list */
astroboy	0:94897d537b31	380	nextUMB = (P_UMB)((U32)(curFMB->nextUMB)-1);
astroboy	0:94897d537b31	381	nextUMB->preMB = (void*)curFMB;
astroboy	0:94897d537b31	382	}
astroboy	0:94897d537b31	383	OsSchedUnlock(); /* Unlock schedule */
astroboy	0:94897d537b31	384	}
astroboy	0:94897d537b31	385
astroboy	0:94897d537b31	386
astroboy	0:94897d537b31	387	/**
astroboy	0:94897d537b31	388	*******************************************************************************
astroboy	0:94897d537b31	389	* @brief Get previous free memory block pointer.
astroboy	0:94897d537b31	390	* @param[in] usedMB Current used memory block.
astroboy	0:94897d537b31	391	* @param[out] None
astroboy	0:94897d537b31	392	* @retval Previous free memory block pointer.
astroboy	0:94897d537b31	393	*
astroboy	0:94897d537b31	394	* @par Description
astroboy	0:94897d537b31	395	* @details This function is called to get previous free memory block pointer.
astroboy	0:94897d537b31	396	*******************************************************************************
astroboy	0:94897d537b31	397	*/
astroboy	0:94897d537b31	398	static P_FMB GetPreFMB(P_UMB usedMB)
astroboy	0:94897d537b31	399	{
astroboy	0:94897d537b31	400	P_UMB preUMB;
astroboy	0:94897d537b31	401	preUMB = usedMB;
astroboy	0:94897d537b31	402	while(((U32)(preUMB->preMB)&0x1)) /* Is previous MB as FMB? */
astroboy	0:94897d537b31	403	{ /* No,get previous MB */
astroboy	0:94897d537b31	404	preUMB = (P_UMB)((U32)(preUMB->preMB)-1);
astroboy	0:94897d537b31	405	}
astroboy	0:94897d537b31	406	return (P_FMB)(preUMB->preMB); /* Yes,return previous MB */
astroboy	0:94897d537b31	407	}
astroboy	0:94897d537b31	408
astroboy	0:94897d537b31	409	#endif

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	10 Sep 2011
Imports:	49
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	2
Followers:	2

CoOS/kernel/kernelHeap.c@0:94897d537b31, 2011-09-10 (annotated)

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