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Annotation of coherent/c/usr/include/sys/malloc.h, revision 1.1.1.1

1.1       root        1: /* (-lgl
                      2:  *     COHERENT Version 3.1.0
                      3:  *     Copyright (c) 1982, 1990 by Mark Williams Company.
                      4:  *     All rights reserved. May not be copied without permission.
                      5:  -lgl) */
                      6: /*
                      7:  * malloc.h
                      8:  * Header file for malloc.c, notmem.c, realloc.c.
                      9:  */
                     10: 
                     11: #ifndef        MALLOC_H
                     12: #define        MALLOC_H
                     13: 
                     14: /* Manifest constants. */
                     15: /*
                     16:  * N.B. 2^ARENASIZE must be greater than sizeof(struct mblock)
                     17:  * so that malloc.c/newarena() does not cause trouble when it combines arenas.
                     18:  */
                     19: #define        ARENASIZE       11      /* round arena sizes up to 2^11==2048   */
                     20: #define        BADSBRK   ((char *)-1)  /* sbrk() failure return value          */
                     21: #define        BLOCKSIZE       1       /* round block sizes up to 2^1==2       */
                     22: #define        DECRSIZE        256     /* arena size decrement at end          */
                     23: #define        FREE            1       /* free block marker                    */
                     24: #define        LEASTFREE (2*sizeof(unsigned))  /* free nothing smaller         */
                     25: 
                     26: /* Macros. */
                     27: #define        bumpp(p,n)      (((char *)(p))+(n))     /* bump pointer p by n bytes */
                     28: #define        isfree(x)       (((unsigned)(x))&FREE)
                     29: #define        mblockp(p)      ((char *)(p)-sizeof(unsigned))  /* convert malloc ptr */
                     30: #define        realsize(x)     ((x) & ~FREE)
                     31: #define        roundup(i,j)    (((i) + (1 << (j)) - 1) & ~((1 << (j)) - 1))
                     32: 
                     33: /* Memory block structure. */
                     34: typedef        struct  mblock  {
                     35:        unsigned blksize;
                     36:        union {
                     37:                char     *next;
                     38:                unsigned usera[];
                     39:        } uval;
                     40: } MBLOCK;
                     41: 
                     42: /* Globals common to malloc/realloc/memok/notmem. */
                     43: extern unsigned __a_count;
                     44: extern MBLOCK  *__a_scanp, *__a_first;
                     45: 
                     46: #endif

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