ipc/shm_fragment_test.c

   1 /***************************************************************************
   2  * Copyright 1995, Technion, Israel Institute of Technology
   3  * Electrical Eng, Software Lab.
   4  * Author:    Michael Veksler.
   5  ***************************************************************************
   6  * File:      shm_fragment_test.c
   7  * Purpose:   Test data fragments and free list items. Allocate and free blocks.
   8  ***************************************************************************
   9  */
  10 #include <assert.h>
  11 #include <stdio.h>
  12 #define DEBUG_DEFINE_VARIABLES     /* just avoid dumb errors */
  13 #include "debugtools.h"            /* for "stddeb" */
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include "shm_block.h"
  17 #include "shm_fragment.h"
  18 #include "xmalloc.h"
  19
  20 #define DO_FREE(id) (-id)
  21 #define LIST_LENGTH 20
  22
  23 int main()
  24 {
  25   struct shm_block *block;
  26   char *ret;
  27   int size;
  28   int i;
  29
  30   /* important: The test will work only for the current implementation of */
  31   /* allocation, if the implementation will change, the list should also */
  32   /* cahnge. */
  33   static int sizes[LIST_LENGTH]={
  34     SHM_MINBLOCK,                  /* 0: should fail */
  35     0x3fe0-4,                      /* 1: */
  36     0x4000-4,                      /* 2: */
  37     0x4000-4,                      /* 3: */
  38     0x4000-4+1,                    /* 4: should fail */
  39     0x4000-4,                      /* 5: */
  40     /* allocated(5,3,2,1) free() */
  41     -5,                            /* 6: */
  42     0x1c00-4,                      /* 7: */
  43     0x1400-4,                      /* 8: */
  44     0x1000-4,                      /* 9: */
  45     /* allocated(9,8,7,3,2,1) free() */
  46     -9,                            /* 10: */
  47     -3,                            /* 11: */
  48     -1,                            /* 12: */
  49     /* allocated(8,7,2) free(9,3,1) */
  50     0x1000-4,                      /* 13: */
  51     -13,                           /* 14: */
  52     0x1000+1-4,                    /* 15: */
  53     /* allocated(8,7,15,2) free(9,[3-15],1) */
  54     -2,                            /* 16: */
  55     /* allocated(8,7,15) free(9,[3-15],1+2) */
  56     -8,                            /* 17: */
  57     -7,                            /* 18: */
  58     -15                            /* 19: */
  59     };
  60
  61   static char *ptr[LIST_LENGTH];
  62
  63   block=xmalloc(SHM_MINBLOCK);
  64
  65   /* setup first item in the free list */
  66   shm_FragmentInit(block, sizeof(*block), SHM_MINBLOCK);
  67
  68   fprintf(stddeb,"After shm_FragmentInit\n");
  69   shm_print_free_list(block);
  70
  71   for(i=0 ; i < LIST_LENGTH; i++) {
  72      size=sizes[i];
  73      if (size>0) {                 /* allocate */
  74         ret=shm_FragPtrAlloc(block, size);
  75         ptr[i]=ret;
  76         fprintf(stddeb,
  77                 "%d: After shm_FragmentAlloc(block, 0x%06x) == ",
  78                 i, size);
  79         if (ret==NULL)
  80            fprintf(stddeb, "NULL\n");
  81         else {
  82            fprintf(stddeb, "0x%06x\n", (int)ret-(int)block);
  83            memset( ret,0, size );  /* test boundaries */
  84         }
  85      } else {                      /* free */
  86         /* free shm fragment */
  87         ret=ptr[-sizes[i]];
  88         fprintf(stddeb, "%d: Doing shm_FragmentFree(block, ", i);
  89         if (ret==NULL)
  90            fprintf(stddeb, "NULL)\n");
  91         else
  92            fprintf(stddeb, "0x%06x)\n", (int)ret-(int)block);
  93         fflush(stddeb);
  94         shm_FragPtrFree(block, ret);
  95      }
  96      shm_print_free_list(block);
  97   }
  98   return 0;
  99 }