#include <err.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#define TESTSIZE        (32*1024*1024L)

char *TestBuf;

void
child(void)
{
        size_t i;

        sleep(1);
        for (i = 0; i < TESTSIZE; i += 4096) {
                ++TestBuf[i];
                //usleep(1000000 / 10);
        }
        usleep(1000000 / 4);    /* ensure children are concurrent */
}

int
main(int argc, char **argv)
{
        int status;

        TestBuf = malloc(TESTSIZE);

        if (fork() == 0) {
                if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1)
                        err(1, "mlockall(MCL_CURRENT | MCL_FUTURE)");
                fork();
                child();
                exit(0);
        }
        wait(&status);

        return (0);
}