mirror of
https://github.com/jart/cosmopolitan.git
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99 lines
3.9 KiB
C
99 lines
3.9 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 2021 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/assert.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/sig.internal.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/calls/struct/timespec.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/limits.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/rdtsc.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/synchronization.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/time/clockstonanos.internal.h"
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textwindows int sys_nanosleep_nt(const struct timespec *req,
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struct timespec *rem) {
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bool alertable;
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uint32_t slice;
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uint64_t begin;
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int64_t ms, toto, nanos;
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struct timespec elapsed;
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// check req is legal timespec
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if (!(0 <= req->tv_nsec && req->tv_nsec < 1000000000)) {
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return einval();
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}
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// save beginning timestamp
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if (!__time_critical && rem) {
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begin = rdtsc();
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} else {
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begin = 0; // to prevent uninitialized warning
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}
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// convert timespec to milliseconds
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ms = _timespec_tomillis(*req);
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for (toto = ms;;) {
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// check if signal was delivered
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if (!__time_critical && _check_interrupts(false, g_fds.p)) {
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if (rem) {
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nanos = ClocksToNanos(rdtsc(), begin);
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elapsed.tv_sec = nanos / 1000000000;
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elapsed.tv_nsec = nanos % 1000000000;
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*rem = _timespec_sub(*req, elapsed);
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if (rem->tv_sec < 0) {
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rem->tv_sec = 0;
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rem->tv_nsec = 0;
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}
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}
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return eintr();
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}
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// configure the sleep
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slice = MIN(__SIG_POLLING_INTERVAL_MS, ms);
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if (__time_critical) {
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alertable = false;
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} else {
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alertable = true;
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POLLTRACE("... sleeping %'ldms of %'ld", toto - ms, toto);
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}
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// perform the sleep
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if (SleepEx(slice, alertable) == kNtWaitIoCompletion) {
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POLLTRACE("IOCP EINTR"); // in case we ever figure it out
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continue;
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}
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// check if full duration has elapsed
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if ((ms -= slice) <= 0) {
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if (rem) {
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rem->tv_sec = 0;
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rem->tv_nsec = 0;
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}
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return 0;
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}
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}
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}
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