1 |
greg |
2.3 |
/* Copyright (c) 1992 Regents of the University of California */ |
2 |
greg |
1.1 |
|
3 |
|
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#ifndef lint |
4 |
|
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static char SCCSid[] = "$SunId$ LBL"; |
5 |
|
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#endif |
6 |
|
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|
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 |
greg |
1.4 |
* malloc(), realloc() and free() use buckets |
11 |
|
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* containing blocks in powers of two, similar to CIT routines. |
12 |
|
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* bfree() puts memory from any source into malloc free lists. |
13 |
|
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* bmalloc() doesn't keep track of free lists -- it's usually |
14 |
greg |
1.3 |
* just a buffered call to sbrk(2). However, bmalloc will |
15 |
|
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* call mscrounge() if sbrk fails. |
16 |
greg |
1.8 |
* mscrounge() returns whatever free memory it can find to satisfy the |
17 |
greg |
1.3 |
* request along with the number of bytes (modified). |
18 |
greg |
1.14 |
* 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) |
21 |
greg |
1.1 |
* |
22 |
|
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* Greg Ward Lawrence Berkeley Laboratory |
23 |
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*/ |
24 |
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|
25 |
greg |
1.6 |
#include <errno.h> |
26 |
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|
27 |
greg |
2.6 |
extern int errno; |
28 |
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29 |
greg |
2.7 |
#ifndef BSD |
30 |
|
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#define bcopy(s,d,n) (void)memcpy(d,s,n) |
31 |
|
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#define bzero(d,n) (void)memset(d,0,n) |
32 |
|
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extern char *memcpy(), *memset(); |
33 |
|
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#endif |
34 |
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|
35 |
greg |
1.9 |
#ifdef MSTATS |
36 |
|
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#include <stdio.h> |
37 |
greg |
2.6 |
static unsigned b_nsbrked = 0; |
38 |
greg |
1.9 |
static unsigned b_nalloced = 0; |
39 |
|
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static unsigned b_nfreed = 0; |
40 |
|
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static unsigned b_nscrounged = 0; |
41 |
greg |
1.14 |
static unsigned b_ncompacted = 0; |
42 |
greg |
1.9 |
static unsigned m_nalloced = 0; |
43 |
|
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static unsigned m_nfreed = 0; |
44 |
|
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static unsigned m_nwasted = 0; |
45 |
|
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#else |
46 |
greg |
1.1 |
#define NULL 0 |
47 |
greg |
1.9 |
#endif |
48 |
greg |
1.1 |
|
49 |
|
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#ifndef ALIGN |
50 |
|
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#define ALIGN int /* align type */ |
51 |
|
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#endif |
52 |
|
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#define BYTES_WORD sizeof(ALIGN) |
53 |
|
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|
54 |
greg |
1.16 |
#ifndef MAXINCR |
55 |
greg |
1.9 |
#define MAXINCR (1<<16) /* largest sbrk(2) increment */ |
56 |
greg |
1.1 |
#endif |
57 |
|
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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 |
greg |
1.12 |
struct { |
61 |
|
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short magic; |
62 |
|
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short bucket; |
63 |
|
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} a; |
64 |
greg |
1.1 |
ALIGN dummy; |
65 |
|
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} M_HEAD; |
66 |
|
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|
67 |
greg |
1.12 |
#define MAGIC 0x1a2 /* magic number for allocated memory */ |
68 |
|
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|
69 |
greg |
1.1 |
#define FIRSTBUCKET 3 |
70 |
|
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#define NBUCKETS 30 |
71 |
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|
72 |
|
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static M_HEAD *free_list[NBUCKETS]; |
73 |
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|
74 |
greg |
1.12 |
static ALIGN dummy_mem; |
75 |
greg |
1.1 |
|
76 |
greg |
2.6 |
static char *memlim[2]; |
77 |
|
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|
78 |
greg |
1.12 |
#define DUMMYLOC ((char *)&dummy_mem) |
79 |
greg |
1.10 |
|
80 |
greg |
2.6 |
#define BADPTR(p) ((p) < memlim[0] | (p) >= memlim[1]) |
81 |
|
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|
82 |
greg |
1.14 |
#ifdef MCOMP /* memory compaction routines */ |
83 |
|
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static char seedtab[1024]; /* seed for compaction table */ |
84 |
greg |
1.12 |
|
85 |
greg |
1.14 |
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) |
91 |
|
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#define mtablen(mb) ((mb)->siz/sizeof(struct mblk)) |
92 |
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93 |
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94 |
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static int |
95 |
|
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mbcmp(m1, m2) /* compare memory block locations */ |
96 |
|
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register struct mblk *m1, *m2; |
97 |
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{ |
98 |
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/* put empty blocks at end */ |
99 |
|
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if (m1->siz == 0) |
100 |
|
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return(m2->siz == 0 ? 0 : 1); |
101 |
|
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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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107 |
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108 |
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int |
109 |
|
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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) |
121 |
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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 |
|
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} |
129 |
|
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tp->ptr = (char *)free_list[bucket]; |
130 |
|
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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 |
|
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#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 |
|
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return(ncomp); |
152 |
|
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} |
153 |
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|
154 |
|
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|
155 |
greg |
1.1 |
char * |
156 |
greg |
1.14 |
mcompact(np) /* compact free lists to satisfy request */ |
157 |
|
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unsigned *np; |
158 |
|
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{ |
159 |
|
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struct mblk *tab; |
160 |
|
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unsigned tablen; |
161 |
|
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register struct mblk *bp, *big; |
162 |
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|
163 |
|
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for ( ; ; ) { |
164 |
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/* compact free lists */ |
165 |
|
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compactfree(); |
166 |
|
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/* find largest block */ |
167 |
|
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tab = mtab(&cptab); tablen = mtablen(&cptab); |
168 |
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big = tab; |
169 |
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bp = tab + tablen; |
170 |
|
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while (--bp > tab) |
171 |
|
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if (bp->siz > big->siz) |
172 |
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big = bp; |
173 |
|
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if (big->siz >= *np) { /* big enough? */ |
174 |
|
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*np = big->siz; |
175 |
|
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big->siz = 0; /* remove from table */ |
176 |
|
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return(big->ptr); /* return it */ |
177 |
|
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} |
178 |
greg |
2.7 |
if (mtablen(big) <= tablen) { |
179 |
greg |
1.14 |
*np = 0; /* cannot grow table */ |
180 |
|
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return(NULL); /* report failure */ |
181 |
|
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} |
182 |
|
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/* enlarge table, free old one */ |
183 |
|
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mtab(big)[0].ptr = cptab.ptr; |
184 |
|
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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 |
|
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big->siz = 0; /* clear and copy */ |
188 |
|
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bcopy((char *)tab, (char *)(mtab(&cptab)+1), |
189 |
|
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tablen*sizeof(struct mblk)); |
190 |
|
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bzero((char *)(mtab(&cptab)+tablen+1), |
191 |
|
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(mtablen(&cptab)-tablen-1)*sizeof(struct mblk)); |
192 |
|
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} /* next round */ |
193 |
|
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} |
194 |
|
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#endif /* MCOMP */ |
195 |
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196 |
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197 |
|
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char * |
198 |
greg |
1.4 |
mscrounge(np) /* search free lists to satisfy request */ |
199 |
greg |
1.3 |
register unsigned *np; |
200 |
|
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{ |
201 |
|
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char *p; |
202 |
|
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register int bucket; |
203 |
|
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register unsigned bsiz; |
204 |
|
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|
205 |
|
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for (bucket = FIRSTBUCKET, bsiz = 1<<FIRSTBUCKET; |
206 |
|
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bucket < NBUCKETS; bucket++, bsiz <<= 1) |
207 |
|
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if (free_list[bucket] != NULL && bsiz+sizeof(M_HEAD) >= *np) { |
208 |
|
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*np = bsiz+sizeof(M_HEAD); |
209 |
|
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p = (char *)free_list[bucket]; |
210 |
|
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free_list[bucket] = free_list[bucket]->next; |
211 |
greg |
1.9 |
#ifdef MSTATS |
212 |
|
|
b_nscrounged += *np; |
213 |
|
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#endif |
214 |
greg |
1.3 |
return(p); |
215 |
|
|
} |
216 |
greg |
1.14 |
#ifdef MCOMP |
217 |
|
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return(mcompact(np)); /* try compaction */ |
218 |
|
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#else |
219 |
greg |
1.3 |
*np = 0; |
220 |
|
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return(NULL); |
221 |
greg |
1.14 |
#endif |
222 |
greg |
1.3 |
} |
223 |
|
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|
224 |
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|
225 |
|
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char * |
226 |
greg |
1.1 |
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 |
greg |
1.3 |
static unsigned pagesz = 0; |
231 |
|
|
static unsigned amnt; |
232 |
greg |
1.1 |
static char *bpos; |
233 |
greg |
1.3 |
static unsigned nrem; |
234 |
|
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unsigned thisamnt; |
235 |
greg |
1.1 |
register char *p; |
236 |
|
|
|
237 |
|
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if (pagesz == 0) { /* initialize */ |
238 |
greg |
1.2 |
pagesz = amnt = getpagesize(); |
239 |
greg |
1.1 |
nrem = (int)sbrk(0); /* page align break */ |
240 |
|
|
nrem = pagesz - (nrem&(pagesz-1)); |
241 |
greg |
2.3 |
bpos = sbrk(nrem); |
242 |
greg |
1.1 |
if ((int)bpos == -1) |
243 |
|
|
return(NULL); |
244 |
greg |
1.14 |
#ifdef MSTATS |
245 |
|
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b_nsbrked += nrem; |
246 |
|
|
#endif |
247 |
greg |
2.4 |
bpos += nrem & (BYTES_WORD-1); /* align pointer */ |
248 |
|
|
nrem &= ~(BYTES_WORD-1); |
249 |
greg |
2.6 |
memlim[0] = bpos; |
250 |
|
|
memlim[1] = bpos + nrem; |
251 |
greg |
1.1 |
} |
252 |
|
|
|
253 |
|
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n = (n+(BYTES_WORD-1))&~(BYTES_WORD-1); /* word align rqst. */ |
254 |
|
|
|
255 |
|
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if (n > nrem) { /* need more core */ |
256 |
greg |
1.3 |
if (n > amnt) { /* big chunk */ |
257 |
|
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thisamnt = (n+(pagesz-1))&~(pagesz-1); |
258 |
|
|
if (thisamnt <= MAXINCR) /* increase amnt */ |
259 |
|
|
amnt = thisamnt; |
260 |
|
|
} else |
261 |
|
|
thisamnt = amnt; |
262 |
|
|
p = sbrk(thisamnt); |
263 |
greg |
1.4 |
if ((int)p == -1) { /* uh-oh, ENOMEM */ |
264 |
greg |
1.3 |
thisamnt = n; /* search free lists */ |
265 |
|
|
p = mscrounge(&thisamnt); |
266 |
|
|
if (p == NULL) /* we're really out */ |
267 |
|
|
return(NULL); |
268 |
|
|
} |
269 |
greg |
1.14 |
#ifdef MSTATS |
270 |
|
|
else b_nsbrked += thisamnt; |
271 |
|
|
#endif |
272 |
greg |
1.3 |
if (p != bpos+nrem) { /* not an increment */ |
273 |
greg |
1.4 |
bfree(bpos, nrem); /* free what we have */ |
274 |
greg |
1.1 |
bpos = p; |
275 |
greg |
1.3 |
nrem = thisamnt; |
276 |
greg |
1.4 |
} else /* otherwise tack on */ |
277 |
greg |
1.3 |
nrem += thisamnt; |
278 |
greg |
2.6 |
if (bpos < memlim[0]) |
279 |
|
|
memlim[0] = bpos; |
280 |
|
|
if (bpos + nrem > memlim[1]) |
281 |
|
|
memlim[1] = bpos + nrem; |
282 |
greg |
1.1 |
} |
283 |
|
|
p = bpos; |
284 |
|
|
bpos += n; /* advance */ |
285 |
|
|
nrem -= n; |
286 |
greg |
1.13 |
#ifdef MSTATS |
287 |
|
|
b_nalloced += n; |
288 |
|
|
#endif |
289 |
greg |
1.1 |
return(p); |
290 |
|
|
} |
291 |
|
|
|
292 |
|
|
|
293 |
|
|
bfree(p, n) /* free n bytes of random memory */ |
294 |
greg |
1.2 |
register char *p; |
295 |
|
|
register unsigned n; |
296 |
greg |
1.1 |
{ |
297 |
|
|
register int bucket; |
298 |
|
|
register unsigned bsiz; |
299 |
greg |
1.9 |
|
300 |
greg |
1.15 |
if (n < 1<<FIRSTBUCKET) |
301 |
|
|
return; |
302 |
greg |
1.9 |
#ifdef MSTATS |
303 |
|
|
b_nfreed += n; |
304 |
|
|
#endif |
305 |
greg |
1.4 |
/* align pointer */ |
306 |
greg |
1.6 |
bsiz = BYTES_WORD - ((unsigned)p&(BYTES_WORD-1)); |
307 |
greg |
1.4 |
if (bsiz < BYTES_WORD) { |
308 |
|
|
p += bsiz; |
309 |
|
|
n -= bsiz; |
310 |
greg |
1.1 |
} |
311 |
greg |
2.6 |
if (p < memlim[0]) |
312 |
|
|
memlim[0] = p; |
313 |
|
|
if (p + n > memlim[1]) |
314 |
|
|
memlim[1] = p + n; |
315 |
greg |
1.4 |
/* 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 |
greg |
1.1 |
} |
325 |
|
|
|
326 |
|
|
|
327 |
|
|
char * |
328 |
|
|
malloc(n) /* allocate n bytes of memory */ |
329 |
|
|
unsigned n; |
330 |
|
|
{ |
331 |
|
|
register M_HEAD *mp; |
332 |
|
|
register int bucket; |
333 |
|
|
register unsigned bsiz; |
334 |
greg |
1.10 |
/* don't return NULL on 0 request */ |
335 |
|
|
if (n == 0) |
336 |
|
|
return(DUMMYLOC); |
337 |
greg |
1.2 |
/* find first bucket that fits */ |
338 |
greg |
1.6 |
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 |
greg |
1.4 |
if (free_list[bucket] == NULL) { /* need more core */ |
347 |
greg |
1.1 |
mp = (M_HEAD *)bmalloc(bsiz+sizeof(M_HEAD)); |
348 |
|
|
if (mp == NULL) |
349 |
|
|
return(NULL); |
350 |
greg |
1.4 |
} else { /* got it */ |
351 |
greg |
1.1 |
mp = free_list[bucket]; |
352 |
|
|
free_list[bucket] = mp->next; |
353 |
|
|
} |
354 |
greg |
1.13 |
#ifdef MSTATS |
355 |
|
|
m_nalloced += bsiz + sizeof(M_HEAD); |
356 |
|
|
m_nwasted += bsiz + sizeof(M_HEAD) - n; |
357 |
|
|
#endif |
358 |
greg |
1.12 |
mp->a.magic = MAGIC; /* tag block */ |
359 |
|
|
mp->a.bucket = bucket; |
360 |
greg |
1.1 |
return((char *)(mp+1)); |
361 |
|
|
} |
362 |
|
|
|
363 |
|
|
|
364 |
|
|
char * |
365 |
|
|
realloc(op, n) /* reallocate memory using malloc() */ |
366 |
greg |
1.6 |
register char *op; |
367 |
greg |
1.1 |
unsigned n; |
368 |
|
|
{ |
369 |
greg |
1.6 |
char *p; |
370 |
greg |
1.1 |
register unsigned on; |
371 |
greg |
1.6 |
/* get old size */ |
372 |
greg |
2.6 |
if (op != DUMMYLOC && !BADPTR(op) && |
373 |
|
|
((M_HEAD *)op-1)->a.magic == MAGIC) |
374 |
greg |
1.12 |
on = 1 << ((M_HEAD *)op-1)->a.bucket; |
375 |
greg |
1.5 |
else |
376 |
|
|
on = 0; |
377 |
greg |
1.6 |
if (n <= on && (n > on>>1 || on == 1<<FIRSTBUCKET)) |
378 |
greg |
1.5 |
return(op); /* same bucket */ |
379 |
greg |
1.13 |
if ((p = malloc(n)) == NULL) |
380 |
greg |
2.5 |
return(n<=on ? op : NULL); |
381 |
greg |
1.13 |
if (on) { |
382 |
greg |
1.2 |
bcopy(op, p, n>on ? on : n); |
383 |
greg |
1.13 |
free(op); |
384 |
|
|
} |
385 |
greg |
1.1 |
return(p); |
386 |
|
|
} |
387 |
|
|
|
388 |
|
|
|
389 |
|
|
free(p) /* free memory allocated by malloc */ |
390 |
|
|
char *p; |
391 |
|
|
{ |
392 |
|
|
register M_HEAD *mp; |
393 |
|
|
register int bucket; |
394 |
|
|
|
395 |
greg |
2.6 |
if (p == DUMMYLOC) |
396 |
greg |
1.13 |
return(1); |
397 |
greg |
2.6 |
if (BADPTR(p)) |
398 |
|
|
goto invalid; |
399 |
greg |
1.1 |
mp = (M_HEAD *)p - 1; |
400 |
greg |
1.12 |
if (mp->a.magic != MAGIC) /* sanity check */ |
401 |
greg |
2.6 |
goto invalid; |
402 |
greg |
1.12 |
bucket = mp->a.bucket; |
403 |
greg |
2.2 |
if (bucket < FIRSTBUCKET | bucket >= NBUCKETS) |
404 |
greg |
2.6 |
goto invalid; |
405 |
greg |
1.1 |
mp->next = free_list[bucket]; |
406 |
|
|
free_list[bucket] = mp; |
407 |
greg |
1.9 |
#ifdef MSTATS |
408 |
|
|
m_nfreed += (1 << bucket) + sizeof(M_HEAD); |
409 |
|
|
#endif |
410 |
greg |
1.13 |
return(1); |
411 |
greg |
2.6 |
invalid: |
412 |
|
|
errno = EINVAL; |
413 |
|
|
return(0); |
414 |
greg |
1.1 |
} |
415 |
greg |
1.9 |
|
416 |
|
|
|
417 |
|
|
#ifdef MSTATS |
418 |
|
|
printmemstats(fp) /* print memory statistics to stream */ |
419 |
|
|
FILE *fp; |
420 |
|
|
{ |
421 |
|
|
register int i; |
422 |
|
|
int n; |
423 |
|
|
register M_HEAD *mp; |
424 |
|
|
unsigned int total = 0; |
425 |
|
|
|
426 |
|
|
fprintf(fp, "Memory statistics:\n"); |
427 |
greg |
1.14 |
fprintf(fp, "\tbmalloc: %d bytes from sbrk\n", b_nsbrked); |
428 |
greg |
1.9 |
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 |
greg |
1.14 |
fprintf(fp, "\tbmalloc: %d bytes compacted\n", b_ncompacted); |
432 |
greg |
1.9 |
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 |
|
|
fprintf(fp, "\t %u total bytes in free list\n", total); |
446 |
|
|
} |
447 |
greg |
1.1 |
#endif |