Category : OS/2 Files
Archive   : EMXTST8F.ZIP
Filename : SWAPTEST.C
#include
#include
#include
#define FALSE 0
#define TRUE 1
static int pages;
static long *count;
static char *mem;
static void usage (void)
{
fprintf (stderr, "Usage: swaptest
exit (1);
}
static void test (int i, int flag)
{
long *pm;
pm = (long *)(mem + 4096 * i);
if (count[i] == 0)
{
if (flag)
{
if (*pm != 0)
{
fprintf (stderr, "Page contents not zero\n");
exit (2);
}
pm[0] = i;
pm[1] = 1;
count[i] = 1;
}
}
else
{
if (pm[0] != i)
{
fprintf (stderr, "Pages confused\n");
exit (2);
}
if (pm[1] != count[i])
{
fprintf (stderr, "Dirty page not restored from swap file\n");
exit (2);
}
if (flag && rand () < RAND_MAX / 3)
pm[1] = ++count[i];
}
}
int main (int argc, char *argv[])
{
long l, iter, w;
char *p;
int c, i, d, u, m;
int interactive;
interactive = _isterm (fileno (stdout));
if (argc != 2)
usage ();
errno = 0;
l = strtol (argv[1], &p, 0);
if (errno != 0 || l <= 0 || l >= 0x7fff || *p != 0)
usage ();
pages = (int)l;
count = malloc (pages * sizeof (*count));
if (count == NULL)
{
fprintf (stderr, "malloc: Out of memory\n");
exit (2);
}
for (i = 0; i < pages; ++i)
count[i] = 0;
d = pages * (RAND_MAX / pages);
fprintf (stdout, "This is swaptest\n"); fflush (stdout);
fprintf (stderr, "\n"); fflush (stderr);
mem = sbrk (pages * 4096);
if ((int)mem == -1)
{
perror ("sbrk");
exit (2);
}
m = 0;
for (iter = 0; ; ++iter)
{
c = _read_kbd (0, 0, 1);
switch (c)
{
case 0x1b:
return (0);
case ' ':
u = 0; w = 0;
for (i = 0; i < pages; ++i)
{
w += count[i];
if (count[i] == m)
++u;
}
printf ("%ld iterations, count=%d for %d pages, average count=%g\n",
iter, m, u, (double)w / (double)pages);
if (u == 0)
++m;
break;
case 'b':
__asm__ ("int $3");
break;
case 't':
printf ("Testing..."); fflush (stdout);
for (i = 0; i < pages; ++i)
{
test (i, FALSE);
if (interactive && (i % 10 == 0))
{
printf ("\rTesting (%d)...", i); fflush (stdout);
}
}
if (interactive)
printf ("\rTesting...OK \n");
else
printf ("OK\n");
fflush (stdout);
break;
}
do
{
i = rand ();
} while (i >= d);
test (i % pages, TRUE);
}
return (0);
}
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