test/stress/t_mlockall.c

   1 #include <err.h>
   2 #include <stdlib.h>
   3 #include <sys/mman.h>
   4 #include <sys/types.h>
   5 #include <sys/wait.h>
   6 #include <unistd.h>
   7
   8 #define TESTSIZE        (32*1024*1024L)
   9
  10 char *TestBuf;
  11
  12 void
  13 child(void)
  14 {
  15         size_t i;
  16
  17         sleep(1);
  18         for (i = 0; i < TESTSIZE; i += 4096) {
  19                 ++TestBuf[i];
  20                 //usleep(1000000 / 10);
  21         }
  22         usleep(1000000 / 4);    /* ensure children are concurrent */
  23 }
  24
  25 int
  26 main(int argc, char **argv)
  27 {
  28         int status;
  29
  30         TestBuf = malloc(TESTSIZE);
  31
  32         if (fork() == 0) {
  33                 if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1)
  34                         err(1, "mlockall(MCL_CURRENT | MCL_FUTURE)");
  35                 fork();
  36                 child();
  37                 exit(0);
  38         }
  39         wait(&status);
  40
  41         return (0);
  42 }