Update.
2000-04-10 Ulrich Drepper <drepper@redhat.com>
* Versions.def (librt): Add GLIBC_2.2.
* rt/Makefile (librt-routines): Add get_clockfreq, clock_getcpuclockid,
clock_getres, clock_gettime, clock_settime, timer_create, timer_delete,
timer_getoverr, timer_gettime, and timer_settime.
* rt/Versions [librt] (GLIBC_2.2): Add clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverrun,
timer_gettime, and timer_settime.
* sysdeps/generic/clock_getcpuclockid.c: New file.
* sysdeps/generic/get_clockfreq.c: New file.
* sysdeps/unix/i386/clock_getcpuclockid.c: New file.
* sysdeps/unix/sysv/linux/i386/get_clockfreq.c: New file.
* sysdeps/mach/hurd/i386/bits/time.h: New file.
* sysdeps/unix/i386/i586/clock_getres.c: New file.
* sysdeps/unix/i386/i586/clock_gettime.c: New file.
* sysdeps/unix/i386/i686/Implies: New file.
* sysdpes/unix/sysv/linux/i386/bits/time.h: New file.
* time/Makefile (routines): Move clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverr,
timer_gettime, and timer_settime to rt/Makefile.
* time/Versions [libc] (GLIBC_2.2): Remove clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverrun,
timer_gettime, and timer_settime.
* sysdeps/mach/hurd/bits/time.h: Drop K&R compatibility. Use __const__
and not const as attribute name.
2000-04-11 15:08:31 +08:00
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/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sys/time.h>
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/* This implementation uses the TSC register in modern (i586 and up) IA-32
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processors (most modern clones also provide it). Since we need the
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resolution of the clock and since determining this is not cheap, we
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cache the value. But this means that systems with processors running
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at different speeds or process migration to machines with slower or
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faster processors will not work without changes. */
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/* Function to determine processor frequency. */
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2000-04-13 04:53:19 +08:00
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extern unsigned long long int __get_clockfreq (void);
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Update.
2000-04-10 Ulrich Drepper <drepper@redhat.com>
* Versions.def (librt): Add GLIBC_2.2.
* rt/Makefile (librt-routines): Add get_clockfreq, clock_getcpuclockid,
clock_getres, clock_gettime, clock_settime, timer_create, timer_delete,
timer_getoverr, timer_gettime, and timer_settime.
* rt/Versions [librt] (GLIBC_2.2): Add clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverrun,
timer_gettime, and timer_settime.
* sysdeps/generic/clock_getcpuclockid.c: New file.
* sysdeps/generic/get_clockfreq.c: New file.
* sysdeps/unix/i386/clock_getcpuclockid.c: New file.
* sysdeps/unix/sysv/linux/i386/get_clockfreq.c: New file.
* sysdeps/mach/hurd/i386/bits/time.h: New file.
* sysdeps/unix/i386/i586/clock_getres.c: New file.
* sysdeps/unix/i386/i586/clock_gettime.c: New file.
* sysdeps/unix/i386/i686/Implies: New file.
* sysdpes/unix/sysv/linux/i386/bits/time.h: New file.
* time/Makefile (routines): Move clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverr,
timer_gettime, and timer_settime to rt/Makefile.
* time/Versions [libc] (GLIBC_2.2): Remove clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverrun,
timer_gettime, and timer_settime.
* sysdeps/mach/hurd/bits/time.h: Drop K&R compatibility. Use __const__
and not const as attribute name.
2000-04-11 15:08:31 +08:00
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/* Clock frequency of the processor. We make it a 64-bit variable
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because some jokers are already playing with processors with more
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than 4GHz. */
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static unsigned long long int freq;
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/* We add an limitation here: we assume that the machine is not up as
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long as it takes to wrap-around the 64-bit timestamp counter. On a
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4GHz machine it would take 136 years of uptime to wrap around so
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2000-04-13 11:55:50 +08:00
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this "limitation" is not severe.
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We use this clock also as the monotonic clock since we don't allow
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setting the CPU-time clock. If this should ever change we will have
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to separate the two. */
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Update.
2000-04-10 Ulrich Drepper <drepper@redhat.com>
* Versions.def (librt): Add GLIBC_2.2.
* rt/Makefile (librt-routines): Add get_clockfreq, clock_getcpuclockid,
clock_getres, clock_gettime, clock_settime, timer_create, timer_delete,
timer_getoverr, timer_gettime, and timer_settime.
* rt/Versions [librt] (GLIBC_2.2): Add clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverrun,
timer_gettime, and timer_settime.
* sysdeps/generic/clock_getcpuclockid.c: New file.
* sysdeps/generic/get_clockfreq.c: New file.
* sysdeps/unix/i386/clock_getcpuclockid.c: New file.
* sysdeps/unix/sysv/linux/i386/get_clockfreq.c: New file.
* sysdeps/mach/hurd/i386/bits/time.h: New file.
* sysdeps/unix/i386/i586/clock_getres.c: New file.
* sysdeps/unix/i386/i586/clock_gettime.c: New file.
* sysdeps/unix/i386/i686/Implies: New file.
* sysdpes/unix/sysv/linux/i386/bits/time.h: New file.
* time/Makefile (routines): Move clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverr,
timer_gettime, and timer_settime to rt/Makefile.
* time/Versions [libc] (GLIBC_2.2): Remove clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverrun,
timer_gettime, and timer_settime.
* sysdeps/mach/hurd/bits/time.h: Drop K&R compatibility. Use __const__
and not const as attribute name.
2000-04-11 15:08:31 +08:00
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#define EXTRA_CLOCK_CASES \
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2000-04-13 11:55:50 +08:00
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case CLOCK_PROCESS_CPUTIME_ID: \
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case CLOCK_THREAD_CPUTIME_ID: \
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Update.
2000-04-10 Ulrich Drepper <drepper@redhat.com>
* Versions.def (librt): Add GLIBC_2.2.
* rt/Makefile (librt-routines): Add get_clockfreq, clock_getcpuclockid,
clock_getres, clock_gettime, clock_settime, timer_create, timer_delete,
timer_getoverr, timer_gettime, and timer_settime.
* rt/Versions [librt] (GLIBC_2.2): Add clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverrun,
timer_gettime, and timer_settime.
* sysdeps/generic/clock_getcpuclockid.c: New file.
* sysdeps/generic/get_clockfreq.c: New file.
* sysdeps/unix/i386/clock_getcpuclockid.c: New file.
* sysdeps/unix/sysv/linux/i386/get_clockfreq.c: New file.
* sysdeps/mach/hurd/i386/bits/time.h: New file.
* sysdeps/unix/i386/i586/clock_getres.c: New file.
* sysdeps/unix/i386/i586/clock_gettime.c: New file.
* sysdeps/unix/i386/i686/Implies: New file.
* sysdpes/unix/sysv/linux/i386/bits/time.h: New file.
* time/Makefile (routines): Move clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverr,
timer_gettime, and timer_settime to rt/Makefile.
* time/Versions [libc] (GLIBC_2.2): Remove clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverrun,
timer_gettime, and timer_settime.
* sysdeps/mach/hurd/bits/time.h: Drop K&R compatibility. Use __const__
and not const as attribute name.
2000-04-11 15:08:31 +08:00
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{ \
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unsigned long long int tsc; \
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\
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2000-04-12 00:27:38 +08:00
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if (__builtin_expect (freq == 0, 0)) \
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Update.
2000-04-10 Ulrich Drepper <drepper@redhat.com>
* Versions.def (librt): Add GLIBC_2.2.
* rt/Makefile (librt-routines): Add get_clockfreq, clock_getcpuclockid,
clock_getres, clock_gettime, clock_settime, timer_create, timer_delete,
timer_getoverr, timer_gettime, and timer_settime.
* rt/Versions [librt] (GLIBC_2.2): Add clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverrun,
timer_gettime, and timer_settime.
* sysdeps/generic/clock_getcpuclockid.c: New file.
* sysdeps/generic/get_clockfreq.c: New file.
* sysdeps/unix/i386/clock_getcpuclockid.c: New file.
* sysdeps/unix/sysv/linux/i386/get_clockfreq.c: New file.
* sysdeps/mach/hurd/i386/bits/time.h: New file.
* sysdeps/unix/i386/i586/clock_getres.c: New file.
* sysdeps/unix/i386/i586/clock_gettime.c: New file.
* sysdeps/unix/i386/i686/Implies: New file.
* sysdpes/unix/sysv/linux/i386/bits/time.h: New file.
* time/Makefile (routines): Move clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverr,
timer_gettime, and timer_settime to rt/Makefile.
* time/Versions [libc] (GLIBC_2.2): Remove clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverrun,
timer_gettime, and timer_settime.
* sysdeps/mach/hurd/bits/time.h: Drop K&R compatibility. Use __const__
and not const as attribute name.
2000-04-11 15:08:31 +08:00
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{ \
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/* This can only happen if we haven't initialized the `freq' \
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variable yet. Do this now. We don't have to protect this \
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code against multiple execution since all of them should \
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lead to the same result. */ \
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freq = __get_clockfreq (); \
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if (__builtin_expect (freq == 0, 0)) \
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/* Something went wrong. */ \
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break; \
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} \
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\
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/* Get the current counter. */ \
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asm volatile ("rdtsc" : "=A" (tsc)); \
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\
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/* Compute the seconds. */ \
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tp->tv_sec = tsc / freq; \
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\
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/* And the nanoseconds. This computation should be stable until \
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we get machines with about 16GHz frequency. */ \
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2000-04-12 00:27:38 +08:00
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tp->tv_nsec = ((tsc % freq) * 1000000000ull) / freq; \
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\
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retval = 0; \
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Update.
2000-04-10 Ulrich Drepper <drepper@redhat.com>
* Versions.def (librt): Add GLIBC_2.2.
* rt/Makefile (librt-routines): Add get_clockfreq, clock_getcpuclockid,
clock_getres, clock_gettime, clock_settime, timer_create, timer_delete,
timer_getoverr, timer_gettime, and timer_settime.
* rt/Versions [librt] (GLIBC_2.2): Add clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverrun,
timer_gettime, and timer_settime.
* sysdeps/generic/clock_getcpuclockid.c: New file.
* sysdeps/generic/get_clockfreq.c: New file.
* sysdeps/unix/i386/clock_getcpuclockid.c: New file.
* sysdeps/unix/sysv/linux/i386/get_clockfreq.c: New file.
* sysdeps/mach/hurd/i386/bits/time.h: New file.
* sysdeps/unix/i386/i586/clock_getres.c: New file.
* sysdeps/unix/i386/i586/clock_gettime.c: New file.
* sysdeps/unix/i386/i686/Implies: New file.
* sysdpes/unix/sysv/linux/i386/bits/time.h: New file.
* time/Makefile (routines): Move clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverr,
timer_gettime, and timer_settime to rt/Makefile.
* time/Versions [libc] (GLIBC_2.2): Remove clock_getres, clock_gettime,
clock_settime, timer_create, timer_delete, timer_getoverrun,
timer_gettime, and timer_settime.
* sysdeps/mach/hurd/bits/time.h: Drop K&R compatibility. Use __const__
and not const as attribute name.
2000-04-11 15:08:31 +08:00
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} \
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break;
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#include <sysdeps/unix/clock_gettime.c>
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