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/* Copyright (c) 1991 Regents of the University of California */ |
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/* Copyright (c) 1992 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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#define BYTES_WORD sizeof(ALIGN) |
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#ifndef MAXINCR |
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#define MAXINCR (1<<16) /* largest sbrk(2) increment */ |
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#ifdef NOVMEM |
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#define getpagesize() 1024 |
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#endif |
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/* malloc free lists */ |
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typedef union m_head { |
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pagesz = amnt = getpagesize(); |
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nrem = (int)sbrk(0); /* page align break */ |
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nrem = pagesz - (nrem&(pagesz-1)); |
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bpos = sbrk(nrem); /* word aligned! */ |
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bpos = sbrk(nrem); |
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if ((int)bpos == -1) |
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return(NULL); |
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#ifdef MSTATS |
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b_nsbrked += nrem; |
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#endif |
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bpos += nrem & (BYTES_WORD-1); /* align pointer */ |
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nrem &= ~(BYTES_WORD-1); |
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} |
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n = (n+(BYTES_WORD-1))&~(BYTES_WORD-1); /* word align rqst. */ |
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if (n <= on && (n > on>>1 || on == 1<<FIRSTBUCKET)) |
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return(op); /* same bucket */ |
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if ((p = malloc(n)) == NULL) |
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return(NULL); |
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return(n<=on ? op : NULL); |
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if (on) { |
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#ifdef BSD |
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bcopy(op, p, n>on ? on : n); |
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register M_HEAD *mp; |
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register int bucket; |
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if (p == NULL || p == DUMMYLOC) |
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if (p == NULL | p == DUMMYLOC) |
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return(1); |
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mp = (M_HEAD *)p - 1; |
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if (mp->a.magic != MAGIC) /* sanity check */ |
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return(0); |
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bucket = mp->a.bucket; |
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if (bucket < FIRSTBUCKET | bucket >= NBUCKETS) |
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return(0); |
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mp->next = free_list[bucket]; |
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free_list[bucket] = mp; |
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#ifdef MSTATS |
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#endif |
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return(1); |
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} |
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#ifndef NOVMEM |
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#ifndef BSD |
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#include <sys/var.h> |
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int |
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getpagesize() /* use SYSV var structure to get page size */ |
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{ |
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struct var v; |
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uvar(&v); |
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return(1 << v.v_pageshift); |
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} |
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#endif |
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#endif |
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#ifdef MSTATS |
