mirror of
https://github.com/jart/cosmopolitan.git
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85 lines
4 KiB
C
85 lines
4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/atomic.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/sigset.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/calls/syscall-sysv.internal.h"
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#include "libc/errno.h"
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#include "libc/intrin/atomic.h"
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#include "libc/nt/enum/status.h"
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#include "libc/nt/ntdll.h"
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#include "libc/stdio/sysparam.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/sysv/consts/timer.h"
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#include "libc/thread/tls.h"
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#ifdef __x86_64__
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static atomic_int usingRes;
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static atomic_bool changedRes;
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static textwindows int sys_clock_nanosleep_nt_impl(int clock,
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struct timespec abs,
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sigset_t waitmask) {
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struct timespec now, wall;
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uint32_t minRes, maxRes, oldRes;
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sys_clock_gettime_nt(0, &wall);
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if (sys_clock_gettime_nt(clock, &now))
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return -1;
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bool wantRes = clock == CLOCK_REALTIME || //
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clock == CLOCK_MONOTONIC || //
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clock == CLOCK_BOOTTIME;
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if (wantRes && !atomic_fetch_add(&usingRes, 1))
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changedRes = NtSuccess(NtQueryTimerResolution(&minRes, &maxRes, &oldRes)) &&
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NtSuccess(NtSetTimerResolution(maxRes, true, &oldRes));
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if (timespec_cmp(abs, now) > 0)
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wall = timespec_add(wall, timespec_sub(abs, now));
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int rc = _park_norestart(wall, waitmask);
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if (wantRes && atomic_fetch_sub(&usingRes, 1) == 1 && changedRes)
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NtSetTimerResolution(0, false, &minRes);
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return rc;
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}
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textwindows int sys_clock_nanosleep_nt(int clock, int flags,
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const struct timespec *req,
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struct timespec *rem) {
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int rc;
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struct timespec abs, now;
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sigset_t m = __sig_block();
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if (flags) {
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abs = *req;
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} else {
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if ((rc = sys_clock_gettime_nt(clock, &now))) {
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rc = _sysret(rc);
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goto BailOut;
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}
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abs = timespec_add(now, *req);
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}
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rc = sys_clock_nanosleep_nt_impl(clock, abs, m);
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if (rc == -1 && !flags && rem && errno == EINTR) {
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sys_clock_gettime_nt(clock, &now);
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*rem = timespec_subz(abs, now);
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}
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BailOut:
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__sig_unblock(m);
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return rc;
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}
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#endif /* __x86_64__ */
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