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https://github.com/jart/cosmopolitan.git
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38bceaeb8f
Multiple projects I care about make the assumption that this isn't a system call that sleeps for a particular number of nanonseconds, but rather a function that parks processes on kernel scheduler quantums. Anyone who wants the old behavior should use cosmo_clock_nanosleep()
61 lines
3.2 KiB
C
61 lines
3.2 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 2024 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/calls.h"
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#include "libc/calls/cp.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/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/thread.h"
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int sys_clock_nanosleep(int clock, int flags, //
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const struct timespec *req, struct timespec *rem) {
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int rc;
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BEGIN_CANCELATION_POINT;
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if (IsLinux() || IsFreebsd() || IsNetbsd()) {
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rc = __sys_clock_nanosleep(clock, flags, req, rem);
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} else if (IsXnu()) {
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rc = sys_clock_nanosleep_xnu(clock, flags, req, rem);
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} else if (IsOpenbsd()) {
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rc = sys_clock_nanosleep_openbsd(clock, flags, req, rem);
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} else if (IsWindows()) {
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rc = sys_clock_nanosleep_nt(clock, flags, req, rem);
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} else {
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rc = enosys();
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}
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if (rc > 0) {
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errno = rc;
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rc = -1;
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}
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// system call support might not detect cancelation on bsds
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if (rc == -1 && errno == EINTR && //
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_weaken(pthread_testcancel_np) && //
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_weaken(pthread_testcancel_np)()) {
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rc = ecanceled();
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}
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END_CANCELATION_POINT;
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STRACE("sys_clock_nanosleep(%s, %s, %s, [%s]) → %d% m",
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DescribeClockName(clock), DescribeSleepFlags(flags),
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DescribeTimespec(0, req), DescribeTimespec(rc, rem), rc);
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return rc;
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}
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