| /* Time inconsistency check test |
| * by: john stultz (johnstul@us.ibm.com) |
| * (C) Copyright IBM 2003, 2004, 2005 |
| */ |
| |
| /* |
| * Copyright (C) 2003-2006 IBM |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of the |
| * License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| * 02111-1307, USA. |
| */ |
| |
| #include <stdio.h> |
| #include <time.h> |
| #include <sys/time.h> |
| |
| #define CALLS_PER_LOOP 64 |
| #define NSEC_PER_SEC 1000000000ULL |
| |
| /* returns 1 if a <= b, 0 otherwise */ |
| static inline int in_order(struct timespec a, struct timespec b) |
| { |
| if (a.tv_sec < b.tv_sec) |
| return 1; |
| if (a.tv_sec > b.tv_sec) |
| return 0; |
| if (a.tv_nsec > b.tv_nsec) |
| return 0; |
| return 1; |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| struct timespec list[CALLS_PER_LOOP]; |
| int i, inconsistent; |
| unsigned long seconds = -1; |
| long now, then; |
| int clock_type = CLOCK_MONOTONIC; |
| |
| if (argc > 1) |
| seconds = atol(argv[1]); |
| |
| /* make sure CLOCK_MONOTONIC is supported */ |
| if (clock_gettime(clock_type, &list[0])) { |
| printf("Using CLOCK_REALTIME\n"); |
| clock_type = CLOCK_REALTIME; |
| } |
| |
| |
| clock_gettime(clock_type, &list[0]); |
| now = then = list[0].tv_sec; |
| |
| /* timestamp start of test */ |
| system("date"); |
| while (seconds == -1 || now - then < seconds) { |
| inconsistent = 0; |
| |
| /* Fill list */ |
| for (i=0; i < CALLS_PER_LOOP; i++) |
| clock_gettime(clock_type, &list[i]); |
| |
| /* Check for inconsistencies */ |
| for (i=0; i < CALLS_PER_LOOP-1; i++) |
| if (!in_order(list[i],list[i+1])) |
| inconsistent = i; |
| |
| /* display inconsistency */ |
| if (inconsistent) { |
| unsigned long long delta; |
| for (i=0; i < CALLS_PER_LOOP; i++) { |
| if (i == inconsistent) |
| printf("--------------------\n"); |
| printf("%lu:%lu\n",list[i].tv_sec, |
| list[i].tv_nsec); |
| if (i == inconsistent + 1 ) |
| printf("--------------------\n"); |
| } |
| delta = list[inconsistent].tv_sec*NSEC_PER_SEC; |
| delta += list[inconsistent].tv_nsec; |
| delta -= list[inconsistent+1].tv_sec*NSEC_PER_SEC; |
| delta -= list[inconsistent+1].tv_nsec; |
| printf("Delta: %llu ns\n", delta); |
| fflush(0); |
| /* timestamp inconsistency*/ |
| system("date"); |
| return -1; |
| } |
| now = list[0].tv_sec; |
| } |
| return 0; |
| } |