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Annotation of os2sdk/demos/apps/sse/ssemem.c, revision 1.1

1.1     ! root        1: #include <doscalls.h>
        !             2: #include <dos.h>
        !             3: #include "ssedefs.h"
        !             4: 
        !             5: 
        !             6: 
        !             7: 
        !             8: /*** allocseg - allocates segments.
        !             9:  *
        !            10:  *   allocseg uses DOSALLOCSEG to allocate segments from DOS.
        !            11:  *
        !            12:  *   This routine will return an error code if it is unable to
        !            13:  *     allocate the segment.
        !            14:  *
        !            15:  *   EXIT   rc - return code of DOSALLOCSEG
        !            16:  *
        !            17:  *
        !            18:  *   EFFECTS : allocates memory from DOS
        !            19:  *            modifies SegTable (by adding a new segment)
        !            20:  *            modifies TotalSegs (by incrementing it by one)
        !            21:  */
        !            22: 
        !            23: short allocseg()
        !            24: {
        !            25:   short  rc;   /* return code of DOS call */
        !            26: 
        !            27:   rc = DOSALLOCSEG(SEGSIZE,
        !            28:                   (unsigned far *)&(SegTable[TotalSegs].segment),
        !            29:                   NOTSHARED);
        !            30: 
        !            31:   if (rc == 0) {
        !            32:       SegTable[TotalSegs].free = SEGSIZE;
        !            33:       ++TotalSegs;
        !            34:   }
        !            35: 
        !            36:   return(rc);
        !            37: } /* end allocseg */
        !            38: 
        !            39: 
        !            40: 
        !            41: 
        !            42: /*** freesegs - free segments
        !            43:  *
        !            44:  *   freesegs uses DOSFREESEG to free all the segments
        !            45:  *     allocated by allocseg.
        !            46:  *
        !            47:  *   EFFECTS: frees all alocated memory (segments) to DOS
        !            48:  *           sets TotalSegs to zero
        !            49:  *           makes SegTable invalid
        !            50:  */
        !            51: 
        !            52: void freesegs()
        !            53: {
        !            54:   register unsigned short i;
        !            55: 
        !            56:   for (i = 0; i < TotalSegs; i++) {
        !            57:       DOSFREESEG(SegTable[i].segment);
        !            58:   }
        !            59:   TotalSegs = 0;
        !            60: } /* end freesegs */

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