nanosleep mystery

Hi,
I executed the following code on slackware 10.2 (with 2.6.22 kernel)
and ubuntu 7.10 (again with 2.6.22 kernel).
On slackware, the value of "diff" is sometimes 0(zero). On ubuntu it
is consistently above 1(one). Can anybody tell me why this may be
happening??

/***************** Code listing ****************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <sys/times.h>

int main(int argc, char *argv[])
{
clock_t t1, t2, diff;
struct timespec req_time, rem_time;

req_time.tv_sec = 0;
req_time.tv_nsec = atol(argv[1]);

do {
if ((t1 = times(NULL)) == (clock_t)(-1)) {
perror("times");
exit(1);
}

if (nanosleep(&req_time, &rem_time) == -1) {
perror("nanosleep");
exit(1);
}

if ((t2 = times(NULL)) == (clock_t)(-1)) {
perror("times");
exit(1);
}

diff = t2 - t1;

printf("diff = %ld\n", diff);
} while (1);

return 0;
}
.

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