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glibc/sysdeps/unix/clock_nanosleep.c
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/* High-resolution sleep with the specified clock. | |
Copyright (C) 2000-2013 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 | |
<http://www.gnu.org/licenses/>. */ | |
#include <assert.h> | |
#include <errno.h> | |
#include <time.h> | |
#include <hp-timing.h> | |
#include <sysdep-cancel.h> | |
#if HP_TIMING_AVAIL | |
# define CPUCLOCK_P(clock) \ | |
((clock) == CLOCK_PROCESS_CPUTIME_ID \ | |
|| ((clock) & ((1 << CLOCK_IDFIELD_SIZE) - 1)) == CLOCK_THREAD_CPUTIME_ID) | |
#else | |
# define CPUCLOCK_P(clock) 0 | |
#endif | |
#ifndef INVALID_CLOCK_P | |
# define INVALID_CLOCK_P(cl) \ | |
((cl) < CLOCK_REALTIME || (cl) > CLOCK_THREAD_CPUTIME_ID) | |
#endif | |
/* This implementation assumes that these is only a `nanosleep' system | |
call. So we have to remap all other activities. */ | |
int | |
__clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, | |
struct timespec *rem) | |
{ | |
struct timespec now; | |
if (__builtin_expect (req->tv_nsec, 0) < 0 | |
|| __builtin_expect (req->tv_nsec, 0) >= 1000000000) | |
return EINVAL; | |
if (clock_id == CLOCK_THREAD_CPUTIME_ID) | |
return EINVAL; /* POSIX specifies EINVAL for this case. */ | |
#ifdef SYSDEP_NANOSLEEP | |
SYSDEP_NANOSLEEP; | |
#endif | |
if (CPUCLOCK_P (clock_id)) | |
return ENOTSUP; | |
if (INVALID_CLOCK_P (clock_id)) | |
return EINVAL; | |
/* 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 (__builtin_expect (clock_gettime (clock_id, &now), 0) != 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; | |
} | |
else if (__builtin_expect (flags, 0) != 0) | |
return EINVAL; | |
else if (clock_id != CLOCK_REALTIME) | |
/* Not supported. */ | |
return ENOTSUP; | |
return __builtin_expect (nanosleep (req, rem), 0) ? errno : 0; | |
} | |
weak_alias (__clock_nanosleep, clock_nanosleep) |