Annotation of embedaddon/lrzsz/src/timing.c, revision 1.1
1.1 ! misho 1: /*
! 2: timing.c - Timing routines for computing elapsed wall time
! 3: Copyright (C) 1994 Michael D. Black
! 4: Copyright (C) 1996, 1997 Uwe Ohse
! 5:
! 6: This program is free software; you can redistribute it and/or modify
! 7: it under the terms of the GNU General Public License as published by
! 8: the Free Software Foundation; either version 2, or (at your option)
! 9: any later version.
! 10:
! 11: This program is distributed in the hope that it will be useful,
! 12: but WITHOUT ANY WARRANTY; without even the implied warranty of
! 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! 14: GNU General Public License for more details.
! 15:
! 16: You should have received a copy of the GNU General Public License
! 17: along with this program; if not, write to the Free Software
! 18: Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
! 19: 02111-1307, USA.
! 20:
! 21: originally written by Michael D. Black, mblack@csihq.com
! 22: */
! 23:
! 24: #include "zglobal.h"
! 25:
! 26: #include "timing.h"
! 27:
! 28: #if HAVE_SYS_PARAM_H
! 29: #include <sys/param.h>
! 30: #endif
! 31:
! 32: #if !defined(TIME_WITH_SYS_TIME) && !defined(HAVE_SYS_TIME_H)
! 33: /* can't use gettimeofday without struct timeval */
! 34: # undef HAVE_GETTIMEOFDAY
! 35: #endif
! 36:
! 37: /* Prefer gettimeofday to ftime to times. */
! 38: #if defined(HAVE_GETTIMEOFDAY)
! 39: # undef HAVE_FTIME
! 40: # undef HAVE_TIMES
! 41: #else
! 42: # if defined(HAVE_FTIME)
! 43: # undef HAVE_TIMES
! 44: # endif
! 45: #endif
! 46:
! 47: #ifdef HAVE_FTIME
! 48: # include <sys/timeb.h>
! 49: #endif
! 50:
! 51: #ifdef HAVE_TIMES
! 52: # if HAVE_SYS_TIMES_H
! 53: # include <sys/times.h>
! 54: # endif
! 55: # ifdef _SC_CLK_TCK
! 56: # define HAVE_SC_CLK_TCK 1
! 57: # else
! 58: # define HAVE_SC_CLK_TCK 0
! 59: # endif
! 60: /* TIMES_TICK may have been set in policy.h, or we may be able to get
! 61: it using sysconf. If neither is the case, try to find a useful
! 62: definition from the system header files. */
! 63: # if !defined(TIMES_TICK) && (!defined(HAVE_SYSCONF) || !defined(HAVE_SC_CLK_TCK))
! 64: # ifdef CLK_TCK
! 65: # define TIMES_TICK CLK_TCK
! 66: # else /* ! defined (CLK_TCK) */
! 67: # ifdef HZ
! 68: # define TIMES_TICK HZ
! 69: # endif /* defined (HZ) */
! 70: # endif /* ! defined (CLK_TCK) */
! 71: #else
! 72: # endif /* TIMES_TICK == 0 && (! HAVE_SYSCONF || ! HAVE_SC_CLK_TCK) */
! 73: # ifndef TIMES_TICK
! 74: # define TIMES_TICK 0
! 75: # endif
! 76: #endif /* HAVE_TIMES */
! 77:
! 78: #ifdef HAVE_GETTIMEOFDAY
! 79: /* collides with Solaris 2.5 prototype? */
! 80: /* int gettimeofday (struct timeval *tv, struct timezone *tz); */
! 81: #endif
! 82:
! 83: double
! 84: timing (int reset, time_t *nowp)
! 85: {
! 86: static double elaptime, starttime, stoptime;
! 87: double yet;
! 88: #define NEED_TIME
! 89: #ifdef HAVE_GETTIMEOFDAY
! 90: struct timeval tv;
! 91: struct timezone tz;
! 92:
! 93: #ifdef DST_NONE
! 94: tz.tz_dsttime = DST_NONE;
! 95: #else
! 96: tz.tz_dsttime = 0;
! 97: #endif
! 98: gettimeofday (&tv, &tz);
! 99: yet=tv.tv_sec + tv.tv_usec/1000000.0;
! 100: #undef NEED_TIME
! 101: #endif
! 102: #ifdef HAVE_FTIME
! 103: static int fbad=0;
! 104:
! 105: if (! fbad)
! 106: {
! 107: struct timeb stime;
! 108: static struct timeb slast;
! 109:
! 110: (void) ftime (&stime);
! 111:
! 112: /* On some systems, such as SCO 3.2.2, ftime can go backwards in
! 113: time. If we detect this, we switch to using time. */
! 114: if (slast.time != 0
! 115: && (stime.time < slast.time
! 116: || (stime.time == slast.time && stime.millitm < slast.millitm)))
! 117: fbad = 1;
! 118: else
! 119: {
! 120: yet = stime.millitm / 1000.0 + stime.time;
! 121: slast = stime;
! 122: }
! 123: }
! 124: if (fbad)
! 125: yet=(double) time(NULL);
! 126: #undef NEED_TIME
! 127: #endif
! 128:
! 129: #ifdef HAVE_TIMES
! 130: struct tms s;
! 131: long i;
! 132: static int itick;
! 133:
! 134: if (itick == 0)
! 135: {
! 136: #if TIMES_TICK == 0
! 137: #if HAVE_SYSCONF && HAVE_SC_CLK_TCK
! 138: itick = (int) sysconf (_SC_CLK_TCK);
! 139: #else /* ! HAVE_SYSCONF || ! HAVE_SC_CLK_TCK */
! 140: const char *z;
! 141:
! 142: z = getenv ("HZ");
! 143: if (z != NULL)
! 144: itick = (int) strtol (z, (char **) NULL, 10);
! 145:
! 146: /* If we really couldn't get anything, just use 60. */
! 147: if (itick == 0)
! 148: itick = 60;
! 149: #endif /* ! HAVE_SYSCONF || ! HAVE_SC_CLK_TCK */
! 150: #else /* TIMES_TICK != 0 */
! 151: itick = TIMES_TICK;
! 152: #endif /* TIMES_TICK == 0 */
! 153: }
! 154: yet = ((double) times (&s)) / itick;
! 155: #undef NEED_TIME
! 156: #endif
! 157:
! 158: #ifdef NEED_TIME
! 159: yet=(double) time(NULL);
! 160: #endif
! 161: if (nowp)
! 162: *nowp=(time_t) yet;
! 163: if (reset) {
! 164: starttime = yet;
! 165: return starttime;
! 166: }
! 167: else {
! 168: stoptime = yet;
! 169: elaptime = stoptime - starttime;
! 170: return elaptime;
! 171: }
! 172: }
! 173:
! 174: /*#define TEST*/
! 175: #ifdef TEST
! 176: main()
! 177: {
! 178: int i;
! 179: printf("timing %g\n",timing(1));
! 180: printf("timing %g\n",timing(0));
! 181: for(i=0;i<20;i++){
! 182: sleep(1);
! 183: printf("timing %g\n",timing(0));
! 184: }
! 185: }
! 186: #endif
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