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

1.1       root        1: /* (-lgl
                      2:  *     COHERENT Version 4.0
                      3:  *     Copyright (c) 1982, 1992 by Mark Williams Company.
                      4:  *     All rights reserved. May not be copied without permission.
                      5:  -lgl) */
                      6: /*
                      7:  * /usr/include/sys/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. 1<<ARENASIZE must be greater than sizeof(struct mblock)
                     17:  * so that malloc.c/newarena() does not cause trouble when it combines arenas.
                     18:  */
                     19: #if    _I386
                     20: #define        ARENASIZE       12      /* round arena sizes up to 1<<12==4096  */
                     21: #define        BLOCKSIZE       2       /* round block sizes up to 1<<2==4      */
                     22: #else
                     23: #define        ARENASIZE       11      /* round arena sizes up to 1<<11==2048  */
                     24: #define        BLOCKSIZE       1       /* round block sizes up to 1<<1==2      */
                     25: #endif
                     26: #define        ALIGNMENT (1<<BLOCKSIZE) /* maximum alignment for any data type */
                     27: #define        BADSBRK   ((char *)-1)  /* sbrk() failure return value          */
                     28: #define        DECRSIZE        256     /* arena size decrement at end          */
                     29: #define        FREE            1       /* free block marker                    */
                     30: #define        LEASTFREE (2*sizeof(unsigned))  /* free nothing smaller         */
                     31: 
                     32: /* Macros. */
                     33: #define        bumpp(p,n)      (((char *)(p))+(n))     /* bump pointer p by n bytes */
                     34: #define        isfree(x)       (((unsigned)(x))&FREE)
                     35: #define        mblockp(p)      ((char *)(p)-sizeof(unsigned))  /* convert malloc ptr */
                     36: #define        realsize(x)     ((x) & ~FREE)
                     37: #define        roundup(i,j)    (((i) + (1 << (j)) - 1) & ~((1 << (j)) - 1))
                     38: 
                     39: /* Memory block structure. */
                     40: typedef        struct  mblock  {
                     41:        unsigned blksize;
                     42:        union {
                     43:                char     *next;
                     44:                unsigned usera[];
                     45:        } uval;
                     46: } MBLOCK;
                     47: 
                     48: /* Globals common to malloc/realloc/memok/notmem. */
                     49: extern unsigned __a_count;
                     50: extern MBLOCK  *__a_scanp, *__a_first, *__a_top;
                     51: 
                     52: #endif
                     53: 
                     54: /* end of /usr/include/sys/malloc.h */

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