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Annotation of os2sdk/demos/apps/sse/ssemem.c, revision 1.1.1.2

1.1.1.2 ! root        1: /* Created by Microsoft Corp. 1987  */
        !             2: 
        !             3: #define INCL_DOSMEMMGR
        !             4: 
        !             5: #include <os2def.h>
        !             6: #include <bsedos.h>
1.1       root        7: #include "ssedefs.h"
                      8: 
                      9: 
                     10: 
                     11: 
                     12: /*** allocseg - allocates segments.
                     13:  *
1.1.1.2 ! root       14:  *   allocseg uses DosAllocSeg to allocate segments from OS/2.
1.1       root       15:  *
                     16:  *   This routine will return an error code if it is unable to
                     17:  *     allocate the segment.
                     18:  *
1.1.1.2 ! root       19:  *   EXIT   rc - return code of DosAllocSeg
1.1       root       20:  *
                     21:  *
1.1.1.2 ! root       22:  *   EFFECTS : allocates memory from OS/2
1.1       root       23:  *            modifies SegTable (by adding a new segment)
                     24:  *            modifies TotalSegs (by incrementing it by one)
                     25:  */
                     26: 
1.1.1.2 ! root       27: SHORT allocseg()
1.1       root       28: {
1.1.1.2 ! root       29:   SHORT  rc;   /* return code of OS/2 call */
1.1       root       30: 
1.1.1.2 ! root       31:   rc = DosAllocSeg(SEGSIZE,
        !            32:                   &(SegTable[TotalSegs].segment),
1.1       root       33:                   NOTSHARED);
                     34: 
                     35:   if (rc == 0) {
                     36:       SegTable[TotalSegs].free = SEGSIZE;
                     37:       ++TotalSegs;
                     38:   }
                     39: 
                     40:   return(rc);
                     41: } /* end allocseg */
                     42: 
                     43: 
                     44: 
                     45: 
                     46: /*** freesegs - free segments
                     47:  *
1.1.1.2 ! root       48:  *   freesegs uses DosFreeSeg to free all the segments
1.1       root       49:  *     allocated by allocseg.
                     50:  *
1.1.1.2 ! root       51:  *   EFFECTS: frees all alocated memory (segments) to OS/2
1.1       root       52:  *           sets TotalSegs to zero
                     53:  *           makes SegTable invalid
                     54:  */
                     55: 
                     56: void freesegs()
                     57: {
1.1.1.2 ! root       58:   register USHORT i;
1.1       root       59: 
                     60:   for (i = 0; i < TotalSegs; i++) {
1.1.1.2 ! root       61:       DosFreeSeg(SegTable[i].segment);
1.1       root       62:   }
                     63:   TotalSegs = 0;
                     64: } /* end freesegs */

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