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/* Copyright (c) 1990 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1992 Regents of the University of California */ |
2 |
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3 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
7 |
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/* |
8 |
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* Fast malloc for memory hogs and VM environments. |
9 |
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* Performs a minimum of searching through free lists. |
10 |
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* bmalloc() doesn't keep track of free lists -- it's basically |
11 |
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* just a buffered call to sbrk(). |
12 |
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* bfree() puts memory from any source into malloc() free lists. |
10 |
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* malloc(), realloc() and free() use buckets |
11 |
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* containing blocks in powers of two, similar to CIT routines. |
12 |
+ |
* bfree() puts memory from any source into malloc free lists. |
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* bmalloc() doesn't keep track of free lists -- it's usually |
14 |
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* just a buffered call to sbrk(2). However, bmalloc will |
15 |
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* call mscrounge() if sbrk fails. |
16 |
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* mscrounge() returns whatever free memory it can find to satisfy the |
17 |
+ |
* request along with the number of bytes (modified). |
18 |
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* mcompact() takes the same arguments as mscrounge() (and is in fact |
19 |
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* called by mscrounge() under dire circumstances), but it uses |
20 |
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* memory compaction to return a larger block. (MCOMP) |
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* |
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* Greg Ward Lawrence Berkeley Laboratory |
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*/ |
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|
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#include <errno.h> |
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|
27 |
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extern int errno; |
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|
29 |
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#ifndef BSD |
30 |
+ |
#define bcopy(s,d,n) (void)memcpy(d,s,n) |
31 |
+ |
#define bzero(d,n) (void)memset(d,0,n) |
32 |
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extern char *memcpy(), *memset(); |
33 |
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#endif |
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|
35 |
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#ifdef MSTATS |
36 |
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#include <stdio.h> |
37 |
+ |
static unsigned b_nsbrked = 0; |
38 |
+ |
static unsigned b_nalloced = 0; |
39 |
+ |
static unsigned b_nfreed = 0; |
40 |
+ |
static unsigned b_nscrounged = 0; |
41 |
+ |
static unsigned b_ncompacted = 0; |
42 |
+ |
static unsigned m_nalloced = 0; |
43 |
+ |
static unsigned m_nfreed = 0; |
44 |
+ |
static unsigned m_nwasted = 0; |
45 |
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#else |
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#define NULL 0 |
47 |
+ |
#endif |
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|
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#ifndef ALIGN |
50 |
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#define ALIGN int /* align type */ |
51 |
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#endif |
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#define BYTES_WORD sizeof(ALIGN) |
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|
54 |
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#ifdef NOVMEM |
55 |
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#define getpagesize() BYTES_WORD |
54 |
> |
#ifndef MAXINCR |
55 |
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#define MAXINCR (1<<16) /* largest sbrk(2) increment */ |
56 |
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#endif |
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|
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/* malloc free lists */ |
58 |
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typedef union m_head { |
59 |
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union m_head *next; |
60 |
< |
int bucket; |
60 |
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struct { |
61 |
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short magic; |
62 |
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short bucket; |
63 |
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} a; |
64 |
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ALIGN dummy; |
65 |
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} M_HEAD; |
66 |
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|
67 |
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#define MAGIC 0x1a2 /* magic number for allocated memory */ |
68 |
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|
69 |
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#define FIRSTBUCKET 3 |
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#define NBUCKETS 30 |
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|
72 |
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static M_HEAD *free_list[NBUCKETS]; |
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|
74 |
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static ALIGN dummy_mem; |
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|
76 |
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static char *memlim[2]; |
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|
78 |
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#define DUMMYLOC ((char *)&dummy_mem) |
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|
80 |
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#define BADPTR(p) ((p) < memlim[0] | (p) >= memlim[1]) |
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|
82 |
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#ifdef MCOMP /* memory compaction routines */ |
83 |
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static char seedtab[1024]; /* seed for compaction table */ |
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|
85 |
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static struct mblk { |
86 |
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char *ptr; /* pointer to memory block */ |
87 |
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unsigned siz; /* size of memory block */ |
88 |
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} cptab = {seedtab, sizeof(seedtab)}; |
89 |
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|
90 |
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#define mtab(mb) ((struct mblk *)(mb)->ptr) |
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#define mtablen(mb) ((mb)->siz/sizeof(struct mblk)) |
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|
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|
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static int |
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mbcmp(m1, m2) /* compare memory block locations */ |
96 |
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register struct mblk *m1, *m2; |
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{ |
98 |
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/* put empty blocks at end */ |
99 |
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if (m1->siz == 0) |
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return(m2->siz == 0 ? 0 : 1); |
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if (m2->siz == 0) |
102 |
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return(-1); |
103 |
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/* otherwise, ascending order */ |
104 |
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return(m1->ptr - m2->ptr); |
105 |
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} |
106 |
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|
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|
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int |
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compactfree() /* compact free lists (moving to table) */ |
110 |
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{ |
111 |
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register struct mblk *tp; |
112 |
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register int bucket; |
113 |
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unsigned n, bsiz, ncomp; |
114 |
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/* fill table from free lists */ |
115 |
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tp = mtab(&cptab); n = mtablen(&cptab); |
116 |
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bucket = NBUCKETS-1; bsiz = 1<<(NBUCKETS-1); |
117 |
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ncomp = 0; |
118 |
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for ( ; ; ) { |
119 |
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while (tp->siz) { /* find empty slot */ |
120 |
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if (--n == 0) |
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goto loopexit; |
122 |
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tp++; |
123 |
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} |
124 |
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while (free_list[bucket] == NULL) { /* find block */ |
125 |
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if (--bucket < FIRSTBUCKET) |
126 |
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goto loopexit; |
127 |
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bsiz >>= 1; |
128 |
+ |
} |
129 |
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tp->ptr = (char *)free_list[bucket]; |
130 |
+ |
ncomp += (tp->siz = bsiz + sizeof(M_HEAD)); |
131 |
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free_list[bucket] = free_list[bucket]->next; |
132 |
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} |
133 |
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loopexit: |
134 |
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if (ncomp == 0) |
135 |
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return(0); /* nothing new to compact */ |
136 |
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#ifdef MSTATS |
137 |
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b_ncompacted += ncomp; |
138 |
+ |
#endif |
139 |
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tp = mtab(&cptab); n = mtablen(&cptab); /* sort table */ |
140 |
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qsort((char *)tp, n, sizeof(struct mblk), mbcmp); |
141 |
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ncomp = 0; /* collect blocks */ |
142 |
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while (--n && tp[1].siz) { |
143 |
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if (tp[0].ptr + tp[0].siz == tp[1].ptr) { |
144 |
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tp[1].ptr = tp[0].ptr; |
145 |
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tp[1].siz += tp[0].siz; |
146 |
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ncomp += tp[0].siz; |
147 |
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tp[0].siz = 0; |
148 |
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} |
149 |
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tp++; |
150 |
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} |
151 |
+ |
return(ncomp); |
152 |
+ |
} |
153 |
+ |
|
154 |
+ |
|
155 |
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char * |
156 |
+ |
mcompact(np) /* compact free lists to satisfy request */ |
157 |
+ |
unsigned *np; |
158 |
+ |
{ |
159 |
+ |
struct mblk *tab; |
160 |
+ |
unsigned tablen; |
161 |
+ |
register struct mblk *bp, *big; |
162 |
+ |
|
163 |
+ |
for ( ; ; ) { |
164 |
+ |
/* compact free lists */ |
165 |
+ |
compactfree(); |
166 |
+ |
/* find largest block */ |
167 |
+ |
tab = mtab(&cptab); tablen = mtablen(&cptab); |
168 |
+ |
big = tab; |
169 |
+ |
bp = tab + tablen; |
170 |
+ |
while (--bp > tab) |
171 |
+ |
if (bp->siz > big->siz) |
172 |
+ |
big = bp; |
173 |
+ |
if (big->siz >= *np) { /* big enough? */ |
174 |
+ |
*np = big->siz; |
175 |
+ |
big->siz = 0; /* remove from table */ |
176 |
+ |
return(big->ptr); /* return it */ |
177 |
+ |
} |
178 |
+ |
if (mtablen(big) <= tablen) { |
179 |
+ |
*np = 0; /* cannot grow table */ |
180 |
+ |
return(NULL); /* report failure */ |
181 |
+ |
} |
182 |
+ |
/* enlarge table, free old one */ |
183 |
+ |
mtab(big)[0].ptr = cptab.ptr; |
184 |
+ |
mtab(big)[0].siz = cptab.siz; |
185 |
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cptab.ptr = big->ptr; |
186 |
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cptab.siz = big->siz; |
187 |
+ |
big->siz = 0; /* clear and copy */ |
188 |
+ |
bcopy((char *)tab, (char *)(mtab(&cptab)+1), |
189 |
+ |
tablen*sizeof(struct mblk)); |
190 |
+ |
bzero((char *)(mtab(&cptab)+tablen+1), |
191 |
+ |
(mtablen(&cptab)-tablen-1)*sizeof(struct mblk)); |
192 |
+ |
} /* next round */ |
193 |
+ |
} |
194 |
+ |
#endif /* MCOMP */ |
195 |
+ |
|
196 |
+ |
|
197 |
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char * |
198 |
+ |
mscrounge(np) /* search free lists to satisfy request */ |
199 |
+ |
register unsigned *np; |
200 |
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{ |
201 |
+ |
char *p; |
202 |
+ |
register int bucket; |
203 |
+ |
register unsigned bsiz; |
204 |
+ |
|
205 |
+ |
for (bucket = FIRSTBUCKET, bsiz = 1<<FIRSTBUCKET; |
206 |
+ |
bucket < NBUCKETS; bucket++, bsiz <<= 1) |
207 |
+ |
if (free_list[bucket] != NULL && bsiz+sizeof(M_HEAD) >= *np) { |
208 |
+ |
*np = bsiz+sizeof(M_HEAD); |
209 |
+ |
p = (char *)free_list[bucket]; |
210 |
+ |
free_list[bucket] = free_list[bucket]->next; |
211 |
+ |
#ifdef MSTATS |
212 |
+ |
b_nscrounged += *np; |
213 |
+ |
#endif |
214 |
+ |
return(p); |
215 |
+ |
} |
216 |
+ |
#ifdef MCOMP |
217 |
+ |
return(mcompact(np)); /* try compaction */ |
218 |
+ |
#else |
219 |
+ |
*np = 0; |
220 |
+ |
return(NULL); |
221 |
+ |
#endif |
222 |
+ |
} |
223 |
+ |
|
224 |
+ |
|
225 |
+ |
char * |
226 |
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bmalloc(n) /* allocate a block of n bytes, sans header */ |
227 |
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register unsigned n; |
228 |
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{ |
229 |
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extern char *sbrk(); |
230 |
< |
static int pagesz = 0; |
231 |
< |
static int amnt; |
230 |
> |
static unsigned pagesz = 0; |
231 |
> |
static unsigned amnt; |
232 |
|
static char *bpos; |
233 |
< |
static int nrem; |
233 |
> |
static unsigned nrem; |
234 |
> |
unsigned thisamnt; |
235 |
|
register char *p; |
236 |
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|
237 |
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if (pagesz == 0) { /* initialize */ |
238 |
< |
amnt = pagesz = getpagesize(); |
238 |
> |
pagesz = amnt = getpagesize(); |
239 |
|
nrem = (int)sbrk(0); /* page align break */ |
240 |
|
nrem = pagesz - (nrem&(pagesz-1)); |
241 |
< |
bpos = sbrk(nrem); /* word aligned! */ |
241 |
> |
bpos = sbrk(nrem); |
242 |
|
if ((int)bpos == -1) |
243 |
|
return(NULL); |
244 |
+ |
#ifdef MSTATS |
245 |
+ |
b_nsbrked += nrem; |
246 |
+ |
#endif |
247 |
+ |
bpos += nrem & (BYTES_WORD-1); /* align pointer */ |
248 |
+ |
nrem &= ~(BYTES_WORD-1); |
249 |
+ |
memlim[0] = bpos; |
250 |
+ |
memlim[1] = bpos + nrem; |
251 |
|
} |
252 |
|
|
253 |
|
n = (n+(BYTES_WORD-1))&~(BYTES_WORD-1); /* word align rqst. */ |
254 |
|
|
255 |
|
if (n > nrem) { /* need more core */ |
256 |
< |
if (n > amnt) /* increase amount */ |
257 |
< |
amnt = (n+(pagesz-1))&~(pagesz-1); |
258 |
< |
p = sbrk(amnt); |
259 |
< |
if ((int)p == -1) |
70 |
< |
return(NULL); |
71 |
< |
if (p != bpos+nrem) { /* someone called sbrk()! */ |
72 |
< |
bfree(bpos, nrem); |
73 |
< |
bpos = p; |
74 |
< |
nrem = amnt; |
256 |
> |
if (n > amnt) { /* big chunk */ |
257 |
> |
thisamnt = (n+(pagesz-1))&~(pagesz-1); |
258 |
> |
if (thisamnt <= MAXINCR) /* increase amnt */ |
259 |
> |
amnt = thisamnt; |
260 |
|
} else |
261 |
< |
nrem += amnt; |
261 |
> |
thisamnt = amnt; |
262 |
> |
p = sbrk(thisamnt); |
263 |
> |
if ((int)p == -1) { /* uh-oh, ENOMEM */ |
264 |
> |
thisamnt = n; /* search free lists */ |
265 |
> |
p = mscrounge(&thisamnt); |
266 |
> |
if (p == NULL) /* we're really out */ |
267 |
> |
return(NULL); |
268 |
> |
} |
269 |
> |
#ifdef MSTATS |
270 |
> |
else b_nsbrked += thisamnt; |
271 |
> |
#endif |
272 |
> |
if (p != bpos+nrem) { /* not an increment */ |
273 |
> |
bfree(bpos, nrem); /* free what we have */ |
274 |
> |
bpos = p; |
275 |
> |
nrem = thisamnt; |
276 |
> |
} else /* otherwise tack on */ |
277 |
> |
nrem += thisamnt; |
278 |
> |
if (bpos < memlim[0]) |
279 |
> |
memlim[0] = bpos; |
280 |
> |
if (bpos + nrem > memlim[1]) |
281 |
> |
memlim[1] = bpos + nrem; |
282 |
|
} |
283 |
|
p = bpos; |
284 |
|
bpos += n; /* advance */ |
285 |
|
nrem -= n; |
286 |
+ |
#ifdef MSTATS |
287 |
+ |
b_nalloced += n; |
288 |
+ |
#endif |
289 |
|
return(p); |
290 |
|
} |
291 |
|
|
292 |
|
|
293 |
|
bfree(p, n) /* free n bytes of random memory */ |
294 |
< |
char *p; |
295 |
< |
unsigned n; |
294 |
> |
register char *p; |
295 |
> |
register unsigned n; |
296 |
|
{ |
89 |
– |
register M_HEAD *mp; |
297 |
|
register int bucket; |
298 |
|
register unsigned bsiz; |
299 |
< |
/* find largest bucket */ |
300 |
< |
bucket = 0; |
301 |
< |
for (bsiz = 1; bsiz+sizeof(M_HEAD) <= n; bsiz <<= 1) |
302 |
< |
bucket++; |
303 |
< |
mp = (M_HEAD *)p; |
304 |
< |
while (bucket > FIRSTBUCKET) { |
305 |
< |
bsiz >>= 1; |
306 |
< |
bucket--; |
307 |
< |
if (n < bsiz+sizeof(M_HEAD)) /* nothing for this bucket */ |
308 |
< |
continue; |
309 |
< |
mp->next = free_list[bucket]; |
103 |
< |
free_list[bucket] = mp; |
104 |
< |
(char *)mp += bsiz+sizeof(M_HEAD); |
105 |
< |
n -= bsiz+sizeof(M_HEAD); |
299 |
> |
|
300 |
> |
if (n < 1<<FIRSTBUCKET) |
301 |
> |
return; |
302 |
> |
#ifdef MSTATS |
303 |
> |
b_nfreed += n; |
304 |
> |
#endif |
305 |
> |
/* align pointer */ |
306 |
> |
bsiz = BYTES_WORD - ((unsigned)p&(BYTES_WORD-1)); |
307 |
> |
if (bsiz < BYTES_WORD) { |
308 |
> |
p += bsiz; |
309 |
> |
n -= bsiz; |
310 |
|
} |
311 |
+ |
if (p < memlim[0]) |
312 |
+ |
memlim[0] = p; |
313 |
+ |
if (p + n > memlim[1]) |
314 |
+ |
memlim[1] = p + n; |
315 |
+ |
/* fill big buckets first */ |
316 |
+ |
for (bucket = NBUCKETS-1, bsiz = 1<<(NBUCKETS-1); |
317 |
+ |
bucket >= FIRSTBUCKET; bucket--, bsiz >>= 1) |
318 |
+ |
if (n >= bsiz+sizeof(M_HEAD)) { |
319 |
+ |
((M_HEAD *)p)->next = free_list[bucket]; |
320 |
+ |
free_list[bucket] = (M_HEAD *)p; |
321 |
+ |
p += bsiz+sizeof(M_HEAD); |
322 |
+ |
n -= bsiz+sizeof(M_HEAD); |
323 |
+ |
} |
324 |
|
} |
325 |
|
|
326 |
|
|
331 |
|
register M_HEAD *mp; |
332 |
|
register int bucket; |
333 |
|
register unsigned bsiz; |
334 |
< |
|
335 |
< |
bucket = FIRSTBUCKET; |
336 |
< |
for (bsiz = 1<<FIRSTBUCKET; bsiz < n; bsiz <<= 1) |
337 |
< |
bucket++; |
338 |
< |
if (free_list[bucket] == NULL) { |
334 |
> |
/* don't return NULL on 0 request */ |
335 |
> |
if (n == 0) |
336 |
> |
return(DUMMYLOC); |
337 |
> |
/* find first bucket that fits */ |
338 |
> |
for (bucket = FIRSTBUCKET, bsiz = 1<<FIRSTBUCKET; |
339 |
> |
bucket < NBUCKETS; bucket++, bsiz <<= 1) |
340 |
> |
if (bsiz >= n) |
341 |
> |
break; |
342 |
> |
if (bucket >= NBUCKETS) { |
343 |
> |
errno = EINVAL; |
344 |
> |
return(NULL); |
345 |
> |
} |
346 |
> |
if (free_list[bucket] == NULL) { /* need more core */ |
347 |
|
mp = (M_HEAD *)bmalloc(bsiz+sizeof(M_HEAD)); |
348 |
|
if (mp == NULL) |
349 |
|
return(NULL); |
350 |
< |
} else { |
350 |
> |
} else { /* got it */ |
351 |
|
mp = free_list[bucket]; |
352 |
|
free_list[bucket] = mp->next; |
353 |
|
} |
354 |
< |
mp->bucket = bucket; |
354 |
> |
#ifdef MSTATS |
355 |
> |
m_nalloced += bsiz + sizeof(M_HEAD); |
356 |
> |
m_nwasted += bsiz + sizeof(M_HEAD) - n; |
357 |
> |
#endif |
358 |
> |
mp->a.magic = MAGIC; /* tag block */ |
359 |
> |
mp->a.bucket = bucket; |
360 |
|
return((char *)(mp+1)); |
361 |
|
} |
362 |
|
|
363 |
|
|
364 |
|
char * |
365 |
|
realloc(op, n) /* reallocate memory using malloc() */ |
366 |
< |
char *op; |
366 |
> |
register char *op; |
367 |
|
unsigned n; |
368 |
|
{ |
369 |
< |
register char *p; |
369 |
> |
char *p; |
370 |
|
register unsigned on; |
371 |
< |
|
372 |
< |
if (op != NULL) |
373 |
< |
on = 1 << ((M_HEAD *)op-1)->bucket; |
371 |
> |
/* get old size */ |
372 |
> |
if (op != DUMMYLOC && !BADPTR(op) && |
373 |
> |
((M_HEAD *)op-1)->a.magic == MAGIC) |
374 |
> |
on = 1 << ((M_HEAD *)op-1)->a.bucket; |
375 |
|
else |
376 |
|
on = 0; |
377 |
< |
if (n <= on && n > on>>1) |
377 |
> |
if (n <= on && (n > on>>1 || on == 1<<FIRSTBUCKET)) |
378 |
|
return(op); /* same bucket */ |
379 |
< |
p = malloc(n); |
380 |
< |
if (p == NULL) |
381 |
< |
return(NULL); |
382 |
< |
#ifdef BSD |
383 |
< |
bcopy(op, p, n>on ? on : n); |
384 |
< |
#else |
154 |
< |
(void)memcpy(p, op, n>on ? on : n); |
155 |
< |
#endif |
156 |
< |
free(op); |
379 |
> |
if ((p = malloc(n)) == NULL) |
380 |
> |
return(n<=on ? op : NULL); |
381 |
> |
if (on) { |
382 |
> |
bcopy(op, p, n>on ? on : n); |
383 |
> |
free(op); |
384 |
> |
} |
385 |
|
return(p); |
386 |
|
} |
387 |
|
|
392 |
|
register M_HEAD *mp; |
393 |
|
register int bucket; |
394 |
|
|
395 |
+ |
if (p == DUMMYLOC) |
396 |
+ |
return(1); |
397 |
+ |
if (BADPTR(p)) |
398 |
+ |
goto invalid; |
399 |
|
mp = (M_HEAD *)p - 1; |
400 |
< |
bucket = mp->bucket; |
400 |
> |
if (mp->a.magic != MAGIC) /* sanity check */ |
401 |
> |
goto invalid; |
402 |
> |
bucket = mp->a.bucket; |
403 |
> |
if (bucket < FIRSTBUCKET | bucket >= NBUCKETS) |
404 |
> |
goto invalid; |
405 |
|
mp->next = free_list[bucket]; |
406 |
|
free_list[bucket] = mp; |
407 |
+ |
#ifdef MSTATS |
408 |
+ |
m_nfreed += (1 << bucket) + sizeof(M_HEAD); |
409 |
+ |
#endif |
410 |
+ |
return(1); |
411 |
+ |
invalid: |
412 |
+ |
errno = EINVAL; |
413 |
+ |
return(0); |
414 |
|
} |
415 |
|
|
416 |
|
|
417 |
< |
#ifndef NOVMEM |
418 |
< |
#ifndef BSD |
419 |
< |
#include <sys/var.h> |
177 |
< |
int |
178 |
< |
getpagesize() /* use SYSV var structure to get page size */ |
417 |
> |
#ifdef MSTATS |
418 |
> |
printmemstats(fp) /* print memory statistics to stream */ |
419 |
> |
FILE *fp; |
420 |
|
{ |
421 |
< |
static int pagesz = 0; |
422 |
< |
struct var v; |
421 |
> |
register int i; |
422 |
> |
int n; |
423 |
> |
register M_HEAD *mp; |
424 |
> |
unsigned int total = 0; |
425 |
|
|
426 |
< |
if (pagesz == 0) { |
427 |
< |
uvar(&v); |
428 |
< |
pagesz = 1 << v.v_pageshift; |
426 |
> |
fprintf(fp, "Memory statistics:\n"); |
427 |
> |
fprintf(fp, "\tbmalloc: %d bytes from sbrk\n", b_nsbrked); |
428 |
> |
fprintf(fp, "\tbmalloc: %d bytes allocated\n", b_nalloced); |
429 |
> |
fprintf(fp, "\tbmalloc: %d bytes freed\n", b_nfreed); |
430 |
> |
fprintf(fp, "\tbmalloc: %d bytes scrounged\n", b_nscrounged); |
431 |
> |
fprintf(fp, "\tbmalloc: %d bytes compacted\n", b_ncompacted); |
432 |
> |
fprintf(fp, "\tmalloc: %d bytes allocated\n", m_nalloced); |
433 |
> |
fprintf(fp, "\tmalloc: %d bytes wasted (%.1f%%)\n", m_nwasted, |
434 |
> |
100.0*m_nwasted/m_nalloced); |
435 |
> |
fprintf(fp, "\tmalloc: %d bytes freed\n", m_nfreed); |
436 |
> |
for (i = NBUCKETS-1; i >= FIRSTBUCKET; i--) { |
437 |
> |
n = 0; |
438 |
> |
for (mp = free_list[i]; mp != NULL; mp = mp->next) |
439 |
> |
n++; |
440 |
> |
if (n) { |
441 |
> |
fprintf(fp, "\t%d * %u\n", n, 1<<i); |
442 |
> |
total += n * ((1<<i) + sizeof(M_HEAD)); |
443 |
> |
} |
444 |
|
} |
445 |
< |
return(pagesz); |
445 |
> |
fprintf(fp, "\t %u total bytes in free list\n", total); |
446 |
|
} |
189 |
– |
#endif |
447 |
|
#endif |