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49 lines
2.9 KiB
C
49 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/struct/timespec.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/time/time.h"
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#include "libc/dce.h"
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#include "libc/nt/synchronization.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/accounting.h"
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#include "libc/fmt/conv.h"
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/**
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* Returns how much CPU program has consumed on time-sharing system.
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*
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* @return value that can be divided by CLOCKS_PER_SEC, or -1 w/ errno
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* @see clock_gettime()
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*/
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int64_t clock(void) {
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struct timespec ts;
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struct NtFileTime creation_time, exit_time, kernel_time, user_time;
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int64_t proc, total;
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// polyfill on Windows where CLOCK_PROCESS_CPUTIME_ID may be not available
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if (IsWindows() && CLOCK_PROCESS_CPUTIME_ID == -1) {
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proc = GetCurrentProcess();
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if (!GetProcessTimes(proc, &creation_time,
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&exit_time, &kernel_time, &user_time)) return -1;
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total = ReadFileTime(kernel_time) + ReadFileTime(user_time);
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ts = WindowsDurationToTimeSpec(total);
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}
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else if (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts) == -1) return -1;
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return ts.tv_sec * CLOCKS_PER_SEC +
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ts.tv_nsec / (1000000000 / CLOCKS_PER_SEC);
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}
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