1#include <assert.h> 2#include <sys/resource.h> 3 4int main() { 5 struct rusage ru1; 6 struct rusage ru2; 7 long long s1; 8 long long us1; 9 long long s2; 10 long long us2; 11 int r; 12 int success = 0; 13 14 r = getrusage(RUSAGE_SELF, &ru1); 15 assert(r == 0); 16 s1 = ru1.ru_utime.tv_sec; 17 us1 = ru1.ru_utime.tv_usec; 18 19 for (int i = 0; i < 10000; i++) { 20 r = getrusage(RUSAGE_SELF, &ru2); 21 assert(r == 0); 22 s2 = ru2.ru_utime.tv_sec; 23 us2 = ru2.ru_utime.tv_usec; 24 assert(s1 <= s2); 25 26 // Verify that some time has passed. 27 if (s2 > s1 || (s2 == s1 && us2 > us1)) { 28 success = 1; 29 break; 30 } 31 } 32 33 assert(success == 1); 34} 35