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annotate lib/times.c @ 40186:8964917f9574

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author Karl Berry <karl@freefriends.org>
date Mon, 18 Feb 2019 08:02:49 -0800
parents b06060465f09
children
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1 /* Get process times
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2
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3 Copyright (C) 2008-2019 Free Software Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, see <https://www.gnu.org/licenses/>. */
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17
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18 /* Written by Simon Josefsson <simon@josefsson.org>, 2008. */
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19
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20 #include <config.h>
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21
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22 /* Get times prototype. */
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23 #include <sys/times.h>
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24
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25 /* Get round. */
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26 #include <math.h>
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27
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28 /* Get GetProcessTimes etc. */
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29 #include <windows.h>
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30
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31 static clock_t
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32 filetime2clock (FILETIME time)
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33 {
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34 float f;
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35
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36 /* We have a 64-bit value, in the form of two DWORDS aka unsigned
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37 int, counting the number of 100-nanosecond intervals. We need to
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38 convert these to clock ticks. Older POSIX uses CLK_TCK to
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39 indicate the number of clock ticks per second while modern POSIX
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40 uses sysconf(_SC_CLK_TCK). Mingw32 does not appear to have
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41 sysconf(_SC_CLK_TCK), but appears to have CLK_TCK = 1000 so we
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42 use it. Note that CLOCKS_PER_SEC constant does not apply here,
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43 it is for use with the clock function. */
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44
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45 f = (unsigned long long) time.dwHighDateTime << 32;
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46 f += time.dwLowDateTime;
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47 f = f * CLK_TCK / 10000000;
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48 return (clock_t) round (f);
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49 }
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50
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51 clock_t
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52 times (struct tms * buffer)
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53 {
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54 FILETIME creation_time, exit_time, kernel_time, user_time;
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55
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56 if (GetProcessTimes (GetCurrentProcess (), &creation_time, &exit_time,
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57 &kernel_time, &user_time) == 0)
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58 return (clock_t) -1;
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59
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60 buffer->tms_utime = filetime2clock (user_time);
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61 buffer->tms_stime = filetime2clock (kernel_time);
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62 buffer->tms_cutime = 0;
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63 buffer->tms_cstime = 0;
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64
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65 return clock ();
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66 }