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Give up on making clock_nanosleep() precise

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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()
This commit is contained in:
Justine Tunney 2024-02-24 10:00:44 -08:00
parent 99f0491f04
commit 38bceaeb8f
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4 changed files with 150 additions and 109 deletions
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61
libc/calls/clock_nanosleep-sys.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2024 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/cp.internal.h"
#include "libc/calls/struct/timespec.h"
#include "libc/calls/struct/timespec.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/intrin/weaken.h"
#include "libc/sysv/errfuns.h"
#include "libc/thread/thread.h"
int sys_clock_nanosleep(int clock, int flags, //
const struct timespec *req, struct timespec *rem) {
int rc;
BEGIN_CANCELATION_POINT;
if (IsLinux() || IsFreebsd() || IsNetbsd()) {
rc = __sys_clock_nanosleep(clock, flags, req, rem);
} else if (IsXnu()) {
rc = sys_clock_nanosleep_xnu(clock, flags, req, rem);
} else if (IsOpenbsd()) {
rc = sys_clock_nanosleep_openbsd(clock, flags, req, rem);
} else if (IsWindows()) {
rc = sys_clock_nanosleep_nt(clock, flags, req, rem);
} else {
rc = enosys();
}
if (rc > 0) {
errno = rc;
rc = -1;
}
// system call support might not detect cancelation on bsds
if (rc == -1 && errno == EINTR && //
_weaken(pthread_testcancel_np) && //
_weaken(pthread_testcancel_np)()) {
rc = ecanceled();
}
END_CANCELATION_POINT;
STRACE("sys_clock_nanosleep(%s, %s, %s, [%s]) → %d% m",
DescribeClockName(clock), DescribeSleepFlags(flags),
DescribeTimespec(0, req), DescribeTimespec(rc, rem), rc);
return rc;
}