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Add C2X timespec_getres

Browse Source 
ISO C2X adds a timespec_getres function alongside the C11
timespec_get, with functionality similar to that of POSIX clock_getres
(including allowing a NULL pointer to be passed to the function).
Implement this function for glibc, similarly to the implementation of
timespec_get.

This includes a basic test like that of timespec_get, but no
documentation in the manual, given that TIME_UTC and timespec_get
aren't documented in the manual at all.  The handling of 64-bit time
follows that in timespec_get; people maintaining patch series for
64-bit time will need to update them accordingly (to export
__timespec_getres64, redirect calls in time.h and run the test for
_TIME_BITS=64).

Tested for x86_64 and x86, and (previous version; only testcase
differs) with build-many-glibcs.py.
This commit is contained in:
Joseph Myers 2021-05-17 20:55:21 +00:00
parent c6b6b4f2c7
commit e5ac7bd679
44 changed files with 189 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
NEWS
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@ -23,6 +23,8 @@ Major new features:
/proc to be mounted. However, different than fexecve, if the syscall is not
supported by the kernel an error is returned instead of trying a fallback.
* The ISO C2X function timespec_getres has been added.
Deprecated and removed features, and other changes affecting compatibility:
* The function pthread_mutex_consistent_np has been deprecated; programs

6
include/time.h
View File

@ -28,6 +28,9 @@ libc_hidden_proto (__clock_gettime)
extern __typeof (clock_settime) __clock_settime;
libc_hidden_proto (__clock_settime)
extern __typeof (clock_getres) __clock_getres;
libc_hidden_proto (__clock_getres)
extern __typeof (clock_nanosleep) __clock_nanosleep;
libc_hidden_proto (__clock_nanosleep);
@ -306,6 +309,7 @@ extern double __difftime (time_t time1, time_t time0);
# define __clock_nanosleep_time64 __clock_nanosleep
# define __clock_gettime64 __clock_gettime
# define __timespec_get64 __timespec_get
# define __timespec_getres64 __timespec_getres
#else
extern int __clock_nanosleep_time64 (clockid_t clock_id,
int flags, const struct __timespec64 *req,
@ -315,6 +319,8 @@ extern int __clock_gettime64 (clockid_t clock_id, struct __timespec64 *tp);
libc_hidden_proto (__clock_gettime64)
extern int __timespec_get64 (struct __timespec64 *ts, int base);
libc_hidden_proto (__timespec_get64)
extern int __timespec_getres64 (struct __timespec64 *ts, int base);
libc_hidden_proto (__timespec_getres64)
#endif
#if __TIMESIZE == 64

1
sysdeps/mach/hurd/i386/libc.abilist
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@ -2208,6 +2208,7 @@ GLIBC_2.34 __isnanf128 F
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 _hurd_libc_proc_init F
GLIBC_2.34 execveat F
GLIBC_2.34 timespec_getres F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

1
sysdeps/posix/clock_getres.c
View File

@ -62,6 +62,7 @@ __clock_getres (clockid_t clock_id, struct timespec *res)
return retval;
}
libc_hidden_def (__clock_getres)
versioned_symbol (libc, __clock_getres, clock_getres, GLIBC_2_17);
/* clock_getres moved to libc in version 2.17;

1
sysdeps/unix/sysv/linux/aarch64/libc.abilist
View File

@ -2445,6 +2445,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/alpha/libc.abilist
View File

@ -2536,6 +2536,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/arc/libc.abilist
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@ -2204,6 +2204,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/arm/be/libc.abilist
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@ -311,6 +311,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/arm/le/libc.abilist
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@ -308,6 +308,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/clock_getres.c
View File

@ -79,6 +79,7 @@ __clock_getres (clockid_t clock_id, struct timespec *res)
return retval;
}
#endif
libc_hidden_def (__clock_getres)
versioned_symbol (libc, __clock_getres, clock_getres, GLIBC_2_17);
/* clock_getres moved to libc in version 2.17;

1
sysdeps/unix/sysv/linux/csky/libc.abilist
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@ -2388,6 +2388,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/hppa/libc.abilist
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@ -2341,6 +2341,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/i386/libc.abilist
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@ -2524,6 +2524,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/ia64/libc.abilist
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@ -2377,6 +2377,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
View File

@ -312,6 +312,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
View File

@ -2467,6 +2467,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
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@ -2439,6 +2439,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
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@ -2436,6 +2436,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
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@ -2432,6 +2432,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
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@ -2430,6 +2430,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
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@ -2438,6 +2438,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
View File

@ -2432,6 +2432,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/nios2/libc.abilist
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@ -2478,6 +2478,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
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@ -2494,6 +2494,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
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@ -2527,6 +2527,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
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@ -2342,6 +2342,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
View File

@ -2641,6 +2641,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
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@ -2206,6 +2206,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
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@ -2406,6 +2406,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
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@ -2492,6 +2492,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
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@ -2379,6 +2379,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/sh/be/libc.abilist
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@ -2348,6 +2348,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/sh/le/libc.abilist
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@ -2345,6 +2345,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
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@ -2485,6 +2485,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
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@ -2398,6 +2398,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

50
sysdeps/unix/sysv/linux/timespec_getres.c Normal file
View File

@ -0,0 +1,50 @@
/* Get resolution of a time base.
Copyright (C) 2021 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.
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 <time.h>
/* Set TS to resolution of time base BASE. */
int
__timespec_getres64 (struct __timespec64 *ts, int base)
{
if (base == TIME_UTC)
{
__clock_getres64 (CLOCK_REALTIME, ts);
return base;
}
return 0;
}
#if __TIMESIZE != 64
libc_hidden_def (__timespec_getres64)
int
__timespec_getres (struct timespec *ts, int base)
{
int ret;
struct __timespec64 tp64;
ret = __timespec_getres64 (&tp64, base);
if (ret == TIME_UTC && ts != NULL)
*ts = valid_timespec64_to_timespec (tp64);
return ret;
}
#endif
strong_alias (__timespec_getres, timespec_getres);

1
sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
View File

@ -2357,6 +2357,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

1
sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
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@ -2460,6 +2460,7 @@ GLIBC_2.34 sem_wait F
GLIBC_2.34 thrd_detach F
GLIBC_2.34 thrd_exit F
GLIBC_2.34 thrd_join F
GLIBC_2.34 timespec_getres F
GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F

4
time/Makefile
View File

@ -36,7 +36,7 @@ routines := offtime asctime clock ctime ctime_r difftime \
stime dysize timegm ftime \
getdate strptime strptime_l \
strftime wcsftime strftime_l wcsftime_l \
timespec_get \
timespec_get timespec_getres \
clock_getcpuclockid clock_getres \
clock_gettime clock_settime clock_nanosleep
@ -50,7 +50,7 @@ tests := test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
tst-clock tst-clock2 tst-clock_nanosleep tst-cpuclock1 \
tst-adjtime tst-ctime tst-difftime tst-mktime4 tst-clock_settime \
tst-settimeofday tst-itimer tst-gmtime tst-timegm \
tst-timespec_get
tst-timespec_get tst-timespec_getres
include ../Rules

3
time/Versions
View File

@ -74,6 +74,9 @@ libc {
clock_getres; clock_gettime; clock_settime; clock_getcpuclockid;
clock_nanosleep;
}
GLIBC_2.34 {
timespec_getres;
}
GLIBC_PRIVATE {
# same as clock_gettime; used in other libraries
__clock_gettime;

1
time/clock_getres.c
View File

@ -27,6 +27,7 @@ __clock_getres (clockid_t clock_id, struct timespec *res)
__set_errno (ENOSYS);
return -1;
}
libc_hidden_def (__clock_getres)
versioned_symbol (libc, __clock_getres, clock_getres, GLIBC_2_17);
/* clock_getres moved to libc in version 2.17;

7
time/time.h
View File

@ -259,6 +259,13 @@ extern int timespec_get (struct timespec *__ts, int __base)
#endif
#if __GLIBC_USE (ISOC2X)
/* Set TS to resolution of time base BASE. */
extern int timespec_getres (struct timespec *__ts, int __base)
__THROW;
#endif
#ifdef __USE_XOPEN_EXTENDED
/* Set to one of the following values to indicate an error.
1 the DATEMSK environment variable is null or undefined,

32
time/timespec_getres.c Normal file
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@ -0,0 +1,32 @@
/* Get resolution of a time base.
Copyright (C) 2021 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.
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 <time.h>
/* Set TS to resolution of time base BASE. */
int
timespec_getres (struct timespec *ts, int base)
{
if (base == TIME_UTC)
{
__clock_getres (CLOCK_REALTIME, ts);
return base;
}
return 0;
}

51
time/tst-timespec_getres.c Normal file
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@ -0,0 +1,51 @@
/* Basic tests for timespec_getres.
Copyright (C) 2021 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 <time.h>
#include <support/check.h>
static int
do_test (void)
{
{
struct timespec ts;
TEST_COMPARE (timespec_getres (&ts, 0), 0);
TEST_COMPARE (timespec_getres (NULL, 0), 0);
}
{
struct timespec ts;
TEST_COMPARE (timespec_getres (&ts, TIME_UTC), TIME_UTC);
/* Expect all supported systems to support TIME_UTC with
resolution better than one second. */
TEST_VERIFY (ts.tv_sec == 0);
TEST_VERIFY (ts.tv_nsec > 0);
TEST_VERIFY (ts.tv_nsec < 1000000000);
TEST_COMPARE (timespec_getres (NULL, TIME_UTC), TIME_UTC);
/* Expect the resolution to be the same as that reported for
CLOCK_REALTIME with clock_getres. */
struct timespec cts;
TEST_COMPARE (clock_getres (CLOCK_REALTIME, &cts), 0);
TEST_COMPARE (ts.tv_sec, cts.tv_sec);
TEST_COMPARE (ts.tv_nsec, cts.tv_nsec);
}
return 0;
}
#include <support/test-driver.c>