mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
3537ecb49c
The generic version is straightforward. For Hurd, its nanosleep implementation is moved to clock_nanosleep with adjustments from generic unix implementation. The generic clock_nanosleep unix version is also removed since it calls nanosleep. Checked on x86_64-linux-gnu and powerpc64le-linux-gnu. Reviewed-by: Florian Weimer <fweimer@redhat.com>
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/* clock_nanosleep - high-resolution sleep with specifiable clock.
|
|
Copyright (C) 2002-2019 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <mach.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
#include <posix-timer.h>
|
|
#include <shlib-compat.h>
|
|
|
|
static int
|
|
nanosleep_call (const struct timespec *req, struct timespec *rem)
|
|
{
|
|
mach_port_t recv;
|
|
struct timespec before;
|
|
error_t err;
|
|
|
|
const mach_msg_timeout_t ms
|
|
= req->tv_sec * 1000
|
|
+ (req->tv_nsec + 999999) / 1000000;
|
|
|
|
recv = __mach_reply_port ();
|
|
|
|
if (rem != NULL)
|
|
__clock_gettime (CLOCK_REALTIME, &before);
|
|
|
|
err = __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
|
|
0, 0, recv, ms, MACH_PORT_NULL);
|
|
__mach_port_destroy (mach_task_self (), recv);
|
|
if (err == EMACH_RCV_INTERRUPTED)
|
|
{
|
|
if (rem != NULL)
|
|
{
|
|
struct timespec after, elapsed;
|
|
__clock_gettime (CLOCK_REALTIME, &after);
|
|
timespec_sub (&elapsed, &after, &before);
|
|
timespec_sub (rem, req, &elapsed);
|
|
}
|
|
|
|
return EINTR;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
__clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
|
|
struct timespec *rem)
|
|
{
|
|
if (clock_id != CLOCK_REALTIME
|
|
|| !valid_nanoseconds (req->tv_nsec)
|
|
|| (flags != 0 && flags != TIMER_ABSTIME))
|
|
return EINVAL;
|
|
|
|
struct timespec now;
|
|
|
|
/* If we got an absolute time, remap it. */
|
|
if (flags == TIMER_ABSTIME)
|
|
{
|
|
long int nsec;
|
|
long int sec;
|
|
|
|
/* Make sure we use safe data types. */
|
|
assert (sizeof (sec) >= sizeof (now.tv_sec));
|
|
|
|
/* Get the current time for this clock. */
|
|
if (__clock_gettime (clock_id, &now) != 0)
|
|
return errno;
|
|
|
|
/* Compute the difference. */
|
|
nsec = req->tv_nsec - now.tv_nsec;
|
|
sec = req->tv_sec - now.tv_sec - (nsec < 0);
|
|
if (sec < 0)
|
|
/* The time has already elapsed. */
|
|
return 0;
|
|
|
|
now.tv_sec = sec;
|
|
now.tv_nsec = nsec + (nsec < 0 ? 1000000000 : 0);
|
|
|
|
/* From now on this is our time. */
|
|
req = &now;
|
|
|
|
/* Make sure we are not modifying the struct pointed to by REM. */
|
|
rem = NULL;
|
|
}
|
|
|
|
return nanosleep_call (req, rem);
|
|
}
|
|
libc_hidden_def (__clock_nanosleep)
|
|
versioned_symbol (libc, __clock_nanosleep, clock_nanosleep, GLIBC_2_17);
|
|
/* clock_nanosleep moved to libc in version 2.17;
|
|
old binaries may expect the symbol version it had in librt. */
|
|
#if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17)
|
|
strong_alias (__clock_nanosleep, __clock_nanosleep_2);
|
|
compat_symbol (libc, __clock_nanosleep_2, clock_nanosleep, GLIBC_2_2);
|
|
#endif
|