mem/q_malloc.c
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 /* $Id$
  *
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  *
  * Copyright (C) 2001-2003 Fhg Fokus
  *
  * This file is part of ser, a free SIP server.
  *
  * ser is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version
  *
  * For a license to use the ser software under conditions
  * other than those described here, or to purchase support for this
  * software, please contact iptel.org by e-mail at the following addresses:
  *    info@iptel.org
  *
  * ser is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License 
  * along with this program; if not, write to the Free Software 
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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  */
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 /*
  * History:
  * --------
  *  ????-??-??  created by andrei
  *  2003-04-14  more debugging added in DBG_QM_MALLOC mode (andrei)
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  *  2003-06-29  added qm_realloc (andrei)
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  */
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 #if !defined(q_malloc) && !(defined VQ_MALLOC) && !(defined F_MALLOC)
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 #define q_malloc
 
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 #include <stdlib.h>
 #include <string.h>
 
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 #include "q_malloc.h"
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 #include "../dprint.h"
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 #include "../globals.h"
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 /*useful macros*/
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 #define FRAG_END(f)  \
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 	((struct qm_frag_end*)((char*)(f)+sizeof(struct qm_frag)+ \
 	   (f)->size))
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 #define FRAG_NEXT(f) \
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 	((struct qm_frag*)((char*)(f)+sizeof(struct qm_frag)+(f)->size+ \
 	   sizeof(struct qm_frag_end)))
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 #define FRAG_PREV(f) \
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 	( (struct qm_frag*) ( ((char*)(f)-sizeof(struct qm_frag_end))- \
 	((struct qm_frag_end*)((char*)(f)-sizeof(struct qm_frag_end)))->size- \
 	   sizeof(struct qm_frag) ) )
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 #define PREV_FRAG_END(f) \
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 	((struct qm_frag_end*)((char*)(f)-sizeof(struct qm_frag_end)))
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 #define FRAG_OVERHEAD	(sizeof(struct qm_frag)+sizeof(struct qm_frag_end))
 
 
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 #define ROUNDTO_MASK	(~((unsigned long)ROUNDTO-1))
 #define ROUNDUP(s)		(((s)+(ROUNDTO-1))&ROUNDTO_MASK)
 #define ROUNDDOWN(s)	((s)&ROUNDTO_MASK)
 
 /*
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 #define ROUNDUP(s)		(((s)%ROUNDTO)?((s)+ROUNDTO)/ROUNDTO*ROUNDTO:(s))
 #define ROUNDDOWN(s)	(((s)%ROUNDTO)?((s)-ROUNDTO)/ROUNDTO*ROUNDTO:(s))
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 */
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 	/* finds the hash value for s, s=ROUNDTO multiple*/
 #define GET_HASH(s)   ( ((s)<QM_MALLOC_OPTIMIZE)?(s)/ROUNDTO: \
 						QM_MALLOC_OPTIMIZE/ROUNDTO+big_hash_idx((s))- \
 							QM_MALLOC_OPTIMIZE_FACTOR+1 )
 
 
 /* computes hash number for big buckets*/
 inline static int big_hash_idx(int s)
 {
 	int idx;
 	/* s is rounded => s = k*2^n (ROUNDTO=2^n) 
 	 * index= i such that 2^i > s >= 2^(i-1)
 	 *
 	 * => index = number of the first non null bit in s*/
 	for (idx=31; !(s&0x80000000) ; s<<=1, idx--);
 	return idx;
 }
 
 
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 #ifdef DBG_QM_MALLOC
 #define ST_CHECK_PATTERN   0xf0f0f0f0
 #define END_CHECK_PATTERN1 0xc0c0c0c0
 #define END_CHECK_PATTERN2 0xabcdefed
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 static  void qm_debug_frag(struct qm_block* qm, struct qm_frag* f)
 {
 	if (f->check!=ST_CHECK_PATTERN){
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 		LOG(L_CRIT, "BUG: qm_*: fragm. %p (address %p) "
 				"beginning overwritten(%lx)!\n",
 				f, (char*)f+sizeof(struct qm_frag),
 				f->check);
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 		qm_status(qm);
 		abort();
 	};
 	if ((FRAG_END(f)->check1!=END_CHECK_PATTERN1)||
 		(FRAG_END(f)->check2!=END_CHECK_PATTERN2)){
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 		LOG(L_CRIT, "BUG: qm_*: fragm. %p (address %p)"
 					" end overwritten(%lx, %lx)!\n",
 				f, (char*)f+sizeof(struct qm_frag), 
 				FRAG_END(f)->check1, FRAG_END(f)->check2);
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 		qm_status(qm);
 		abort();
 	}
 	if ((f>qm->first_frag)&&
 			((PREV_FRAG_END(f)->check1!=END_CHECK_PATTERN1) ||
 				(PREV_FRAG_END(f)->check2!=END_CHECK_PATTERN2) ) ){
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 		LOG(L_CRIT, "BUG: qm_*: prev. fragm. tail overwritten(%lx, %lx)[%p:%p]!"
 					"\n",
 				PREV_FRAG_END(f)->check1, PREV_FRAG_END(f)->check2, f,
 				(char*)f+sizeof(struct qm_frag));
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 		qm_status(qm);
 		abort();
 	}
 }
 #endif
 
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 static inline void qm_insert_free(struct qm_block* qm, struct qm_frag* frag)
 {
 	struct qm_frag* f;
 	struct qm_frag* prev;
 	int hash;
 	
 	hash=GET_HASH(frag->size);
 	for(f=qm->free_hash[hash].head.u.nxt_free; f!=&(qm->free_hash[hash].head);
 			f=f->u.nxt_free){
 		if (frag->size <= f->size) break;
 	}
 	/*insert it here*/
 	prev=FRAG_END(f)->prev_free;
 	prev->u.nxt_free=frag;
 	FRAG_END(frag)->prev_free=prev;
 	frag->u.nxt_free=f;
 	FRAG_END(f)->prev_free=frag;
 }
 
 
 
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 /* init malloc and return a qm_block*/
 struct qm_block* qm_malloc_init(char* address, unsigned int size)
 {
 	char* start;
 	char* end;
 	struct qm_block* qm;
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 	unsigned long init_overhead;
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 	int h;
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 	/* make address and size multiple of 8*/
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 	start=(char*)ROUNDUP((unsigned long) address);
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 	DBG("qm_malloc_init: QM_OPTIMIZE=%ld, /ROUNDTO=%ld\n",
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 			QM_MALLOC_OPTIMIZE, QM_MALLOC_OPTIMIZE/ROUNDTO);
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 	DBG("qm_malloc_init: QM_HASH_SIZE=%ld, qm_block size=%d\n",
 			QM_HASH_SIZE, (int)sizeof(struct qm_block));
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 	DBG("qm_malloc_init(%p, %d), start=%p\n", address, size, start);
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 	if (size<start-address) return 0;
 	size-=(start-address);
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 	if (size <(MIN_FRAG_SIZE+FRAG_OVERHEAD)) return 0;
 	size=ROUNDDOWN(size);
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 	init_overhead=ROUNDUP(sizeof(struct qm_block))+sizeof(struct qm_frag)+
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 		sizeof(struct qm_frag_end);
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 	DBG("qm_malloc_init: size= %d, init_overhead=%ld\n", size, init_overhead);
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 	if (size < init_overhead)
 	{
 		/* not enough mem to create our control structures !!!*/
 		return 0;
 	}
 	end=start+size;
 	qm=(struct qm_block*)start;
 	memset(qm, 0, sizeof(struct qm_block));
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 	size-=init_overhead;
 	qm->size=size;
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 	qm->real_used=init_overhead;
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 	qm->max_real_used=qm->real_used;
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 	qm->first_frag=(struct qm_frag*)(start+ROUNDUP(sizeof(struct qm_block)));
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 	qm->last_frag_end=(struct qm_frag_end*)(end-sizeof(struct qm_frag_end));
 	/* init initial fragment*/
 	qm->first_frag->size=size;
 	qm->last_frag_end->size=size;
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 #ifdef DBG_QM_MALLOC
 	qm->first_frag->check=ST_CHECK_PATTERN;
 	qm->last_frag_end->check1=END_CHECK_PATTERN1;
 	qm->last_frag_end->check2=END_CHECK_PATTERN2;
 #endif
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 	/* init free_hash* */
 	for (h=0; h<QM_HASH_SIZE;h++){
 		qm->free_hash[h].head.u.nxt_free=&(qm->free_hash[h].head);
 		qm->free_hash[h].tail.prev_free=&(qm->free_hash[h].head);
 		qm->free_hash[h].head.size=0;
 		qm->free_hash[h].tail.size=0;
 	}
 	
 	/* link initial fragment into the free list*/
 	
 	qm_insert_free(qm, qm->first_frag);
 	
 	/*qm->first_frag->u.nxt_free=&(qm->free_lst);
 	  qm->last_frag_end->prev_free=&(qm->free_lst);
 	*/
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 	return qm;
 }
 
 
 
 static inline void qm_detach_free(struct qm_block* qm, struct qm_frag* frag)
 {
 	struct qm_frag *prev;
 	struct qm_frag *next;
 	
 	prev=FRAG_END(frag)->prev_free;
 	next=frag->u.nxt_free;
 	prev->u.nxt_free=next;
 	FRAG_END(next)->prev_free=prev;
 	
 }
 
 
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 #ifdef DBG_QM_MALLOC
 static inline struct qm_frag* qm_find_free(struct qm_block* qm, 
 											unsigned int size,
 											unsigned int *count)
 #else
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 static inline struct qm_frag* qm_find_free(struct qm_block* qm, 
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 											unsigned int size)
 #endif
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 {
 	int hash;
 	struct qm_frag* f;
 
 	for (hash=GET_HASH(size); hash<QM_HASH_SIZE; hash++){
 		for (f=qm->free_hash[hash].head.u.nxt_free; 
 					f!=&(qm->free_hash[hash].head); f=f->u.nxt_free){
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 #ifdef DBG_QM_MALLOC
 			*count+=1; /* *count++ generates a warning with gcc 2.9* -Wall */
 #endif
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 			if (f->size>=size) return f;
 		}
 	/*try in a bigger bucket*/
 	}
 	/* not found */
 	return 0;
 }
 
 
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 /* returns 0 on success, -1 on error;
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  * new_size < size & rounded-up already!*/
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 static inline
 #ifdef DBG_QM_MALLOC
 int split_frag(struct qm_block* qm, struct qm_frag* f, unsigned int new_size,
 				char* file, char* func, unsigned int line)
 #else
 int split_frag(struct qm_block* qm, struct qm_frag* f, unsigned int new_size)
 #endif
 {
 	unsigned int rest;
 	struct qm_frag* n;
 	struct qm_frag_end* end;
 	
 	rest=f->size-new_size;
 	if (rest>(FRAG_OVERHEAD+MIN_FRAG_SIZE)){
 		f->size=new_size;
 		/*split the fragment*/
 		end=FRAG_END(f);
 		end->size=new_size;
 		n=(struct qm_frag*)((char*)end+sizeof(struct qm_frag_end));
 		n->size=rest-FRAG_OVERHEAD;
 		FRAG_END(n)->size=n->size;
 		qm->real_used+=FRAG_OVERHEAD;
 #ifdef DBG_QM_MALLOC
 		end->check1=END_CHECK_PATTERN1;
 		end->check2=END_CHECK_PATTERN2;
 		/* frag created by malloc, mark it*/
 		n->file=file;
 		n->func=func;
 		n->line=line;
 		n->check=ST_CHECK_PATTERN;
 #endif
 		/* reinsert n in free list*/
 		qm_insert_free(qm, n);
 		return 0;
 	}else{
 			/* we cannot split this fragment any more */
 		return -1;
 	}
 }
 
 
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 #ifdef DBG_QM_MALLOC
 void* qm_malloc(struct qm_block* qm, unsigned int size, char* file, char* func,
 					unsigned int line)
 #else
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 void* qm_malloc(struct qm_block* qm, unsigned int size)
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 #endif
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 {
 	struct qm_frag* f;
 	
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 #ifdef DBG_QM_MALLOC
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 	unsigned int list_cntr;
 
 	list_cntr = 0;
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 	DBG("qm_malloc(%p, %d) called from %s: %s(%d)\n", qm, size, file, func,
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 			line);
 #endif
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 	/*size must be a multiple of 8*/
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 	size=ROUNDUP(size);
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 	if (size>(qm->size-qm->real_used)) return 0;
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 	/*search for a suitable free frag*/
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 #ifdef DBG_QM_MALLOC
 	if ((f=qm_find_free(qm, size, &list_cntr))!=0){
 #else
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 	if ((f=qm_find_free(qm, size))!=0){
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 #endif
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 		/* we found it!*/
 		/*detach it from the free list*/
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 #ifdef DBG_QM_MALLOC
 			qm_debug_frag(qm, f);
 #endif
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 		qm_detach_free(qm, f);
 		/*mark it as "busy"*/
 		f->u.is_free=0;
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 		/* we ignore split return */
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 #ifdef DBG_QM_MALLOC
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 		split_frag(qm, f, size, file, "fragm. from qm_malloc", line);
 #else
 		split_frag(qm, f, size);
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 #endif
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 		qm->real_used+=f->size;
 		qm->used+=f->size;
 		if (qm->max_real_used<qm->real_used)
 			qm->max_real_used=qm->real_used;
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 #ifdef DBG_QM_MALLOC
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 		f->file=file;
 		f->func=func;
 		f->line=line;
 		f->check=ST_CHECK_PATTERN;
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 		/*  FRAG_END(f)->check1=END_CHECK_PATTERN1;
 			FRAG_END(f)->check2=END_CHECK_PATTERN2;*/
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 		DBG("qm_malloc(%p, %d) returns address %p frag. %p (size=%ld) on %d -th"
 				" hit\n",
 			 qm, size, (char*)f+sizeof(struct qm_frag), f, f->size, list_cntr );
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 #endif
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 		return (char*)f+sizeof(struct qm_frag);
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 	}
 	return 0;
 }
 
 
 
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 #ifdef DBG_QM_MALLOC
 void qm_free(struct qm_block* qm, void* p, char* file, char* func, 
 				unsigned int line)
 #else
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 void qm_free(struct qm_block* qm, void* p)
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 #endif
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 {
 	struct qm_frag* f;
 	struct qm_frag* prev;
 	struct qm_frag* next;
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 	unsigned long size;
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 #ifdef DBG_QM_MALLOC
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 	DBG("qm_free(%p, %p), called from %s: %s(%d)\n", qm, p, file, func, line);
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 	if (p>(void*)qm->last_frag_end || p<(void*)qm->first_frag){
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 		LOG(L_CRIT, "BUG: qm_free: bad pointer %p (out of memory block!) - "
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 				"aborting\n", p);
 		abort();
 	}
 #endif
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 	if (p==0) {
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 		LOG(L_WARN, "WARNING:qm_free: free(0) called\n");
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 		return;
 	}
 	prev=next=0;
 	f=(struct qm_frag*) ((char*)p-sizeof(struct qm_frag));
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 #ifdef DBG_QM_MALLOC
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 	qm_debug_frag(qm, f);
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 	if (f->u.is_free){
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 		LOG(L_CRIT, "BUG: qm_free: freeing already freed pointer,"
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 				" first free: %s: %s(%ld) - aborting\n",
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 				f->file, f->func, f->line);
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 		abort();
 	}
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 	DBG("qm_free: freeing frag. %p alloc'ed from %s: %s(%ld)\n",
 			f, f->file, f->func, f->line);
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 #endif
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 	size=f->size;
 	qm->used-=size;
 	qm->real_used-=size;
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 #ifdef QM_JOIN_FREE
 	/* join packets if possible*/
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 	next=FRAG_NEXT(f);
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 	if (((char*)next < (char*)qm->last_frag_end) &&( next->u.is_free)){
 		/* join */
 		qm_detach_free(qm, next);
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 		size+=next->size+FRAG_OVERHEAD;
 		qm->real_used-=FRAG_OVERHEAD;
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 	}
 	
 	if (f > qm->first_frag){
 		prev=FRAG_PREV(f);
 		/*	(struct qm_frag*)((char*)f - (struct qm_frag_end*)((char*)f-
 								sizeof(struct qm_frag_end))->size);*/
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 #ifdef DBG_QM_MALLOC
 		qm_debug_frag(qm, f);
 #endif
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 		if (prev->u.is_free){
 			/*join*/
 			qm_detach_free(qm, prev);
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 			size+=prev->size+FRAG_OVERHEAD;
 			qm->real_used-=FRAG_OVERHEAD;
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 			f=prev;
 		}
 	}
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 	f->size=size;
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 	FRAG_END(f)->size=f->size;
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 #endif /* QM_JOIN_FREE*/
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 #ifdef DBG_QM_MALLOC
 	f->file=file;
 	f->func=func;
 	f->line=line;
 #endif
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 	qm_insert_free(qm, f);
 }
 
 
 
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 #ifdef DBG_QM_MALLOC
 void* qm_realloc(struct qm_block* qm, void* p, unsigned int size,
 					char* file, char* func, unsigned int line)
 #else
 void* qm_realloc(struct qm_block* qm, void* p, unsigned int size)
 #endif
 {
 	struct qm_frag* f;
 	unsigned int diff;
 	unsigned int orig_size;
 	struct qm_frag* n;
 	void* ptr;
 	
 	
 #ifdef DBG_QM_MALLOC
 	DBG("qm_realloc(%p, %p, %d) called from %s: %s(%d)\n", qm, p, size,
 			file, func, line);
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 	if ((p)&&(p>(void*)qm->last_frag_end || p<(void*)qm->first_frag)){
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 		LOG(L_CRIT, "BUG: qm_free: bad pointer %p (out of memory block!) - "
 				"aborting\n", p);
 		abort();
 	}
 #endif
 	
 	if (size==0) {
 		if (p)
 #ifdef DBG_QM_MALLOC
 			qm_free(qm, p, file, func, line);
 #else
 			qm_free(qm, p);
 #endif
 		return 0;
 	}
 	if (p==0)
 #ifdef DBG_QM_MALLOC
 		return qm_malloc(qm, size, file, func, line);
 #else
 		return qm_malloc(qm, size);
 #endif
 	f=(struct qm_frag*) ((char*)p-sizeof(struct qm_frag));
 #ifdef DBG_QM_MALLOC
 	qm_debug_frag(qm, f);
 	DBG("qm_realloc: realloc'ing frag %p alloc'ed from %s: %s(%ld)\n",
 			f, f->file, f->func, f->line);
 	if (f->u.is_free){
 		LOG(L_CRIT, "BUG:qm_realloc: trying to realloc an already freed "
 				"pointer %p , fragment %p -- aborting\n", p, f);
 		abort();
 	}
 #endif
 	/* find first acceptable size */
 	size=ROUNDUP(size);
 	if (f->size > size){
 		/* shrink */
 #ifdef DBG_QM_MALLOC
 		DBG("qm_realloc: shrinking from %ld to %d\n", f->size, size);
 		if(split_frag(qm, f, size, file, "fragm. from qm_realloc", line)!=0){
 		DBG("qm_realloc : shrinked succesfull\n");
 #else
 		if(split_frag(qm, f, size)!=0){
 #endif
 			/* update used sizes */
 			qm->real_used-=(f->size-size);
 			qm->used-=(f->size-size);
 		}
 		
 	}else if (f->size < size){
 		/* grow */
 #ifdef DBG_QM_MALLOC
 		DBG("qm_realloc: growing from %ld to %d\n", f->size, size);
 #endif
 			orig_size=f->size;
 			diff=size-f->size;
 			n=FRAG_NEXT(f);
 			if (((char*)n < (char*)qm->last_frag_end) && 
 					(n->u.is_free)&&((n->size+FRAG_OVERHEAD)>=diff)){
 				/* join  */
 				qm_detach_free(qm, n);
 				f->size+=n->size+FRAG_OVERHEAD;
 				qm->real_used-=FRAG_OVERHEAD;
 				FRAG_END(f)->size=f->size;
 				/* end checks should be ok */
 				/* split it if necessary */
 				if (f->size > size ){
 	#ifdef DBG_QM_MALLOC
 					split_frag(qm, f, size, file, "fragm. from qm_realloc",
 										line);
 	#else
 					split_frag(qm, f, size);
 	#endif
 				}
 				qm->real_used+=(f->size-orig_size);
 				qm->used+=(f->size-orig_size);
 			}else{
 				/* could not join => realloc */
 	#ifdef DBG_QM_MALLOC
 				ptr=qm_malloc(qm, size, file, func, line);
 	#else
 				ptr=qm_malloc(qm, size);
 	#endif
 				if (ptr)
 					/* copy, need by libssl */
 					memcpy(ptr, p, orig_size);
 	#ifdef DBG_QM_MALLOC
 					qm_free(qm, p, file, func, line);
 	#else
 					qm_free(qm, p);
 	#endif
 				p=ptr;
 			}
 	}else{
 		/* do nothing */
 #ifdef DBG_QM_MALLOC
 		DBG("qm_realloc: doing nothing, same size: %ld - %d\n", f->size, size);
 #endif
 	}
 #ifdef DBG_QM_MALLOC
 	DBG("qm_realloc: returning %p\n", p);
 #endif
 	return p;
 }
 
 
 
 
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 void qm_status(struct qm_block* qm)
 {
 	struct qm_frag* f;
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 	int i,j;
 	int h;
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 	LOG(memlog, "qm_status (%p):\n", qm);
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 	if (!qm) return;
 
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 	LOG(memlog, " heap size= %ld\n", qm->size);
 	LOG(memlog, " used= %ld, used+overhead=%ld, free=%ld\n",
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 			qm->used, qm->real_used, qm->size-qm->real_used);
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 	LOG(memlog, " max used (+overhead)= %ld\n", qm->max_real_used);
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 	LOG(memlog, "dumping all allocked. fragments:\n");
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 	for (f=qm->first_frag, i=0;(char*)f<(char*)qm->last_frag_end;f=FRAG_NEXT(f)
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 			,i++){
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 		if (! f->u.is_free){
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 			LOG(memlog, "    %3d. %c  address=%p frag=%p size=%ld\n", i, 
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 				(f->u.is_free)?'a':'N',
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 				(char*)f+sizeof(struct qm_frag), f, f->size);
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 #ifdef DBG_QM_MALLOC
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 			LOG(memlog, "            %s from %s: %s(%ld)\n",
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 				(f->u.is_free)?"freed":"alloc'd", f->file, f->func, f->line);
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 			LOG(memlog, "        start check=%lx, end check= %lx, %lx\n",
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 				f->check, FRAG_END(f)->check1, FRAG_END(f)->check2);
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 #endif
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 		}
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 	}
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 	LOG(memlog, "dumping free list stats :\n");
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 	for(h=0,i=0;h<QM_HASH_SIZE;h++){
 		
 		for (f=qm->free_hash[h].head.u.nxt_free,j=0; 
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 				f!=&(qm->free_hash[h].head); f=f->u.nxt_free, i++, j++);
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 			if (j) LOG(memlog, "hash= %3d. fragments no.: %5d\n", h, j);
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 	}
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 	LOG(memlog, "-----------------------------\n");
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 }
 
 
 
 
 #endif