diff options
Diffstat (limited to 'sysdeps/unix/i386/i586/clock_gettime.c')
| -rw-r--r-- | sysdeps/unix/i386/i586/clock_gettime.c | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/sysdeps/unix/i386/i586/clock_gettime.c b/sysdeps/unix/i386/i586/clock_gettime.c deleted file mode 100644 index 5e28370acf..0000000000 --- a/sysdeps/unix/i386/i586/clock_gettime.c +++ /dev/null @@ -1,107 +0,0 @@ -/* Copyright (C) 1999, 2000, 2001 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 Library General Public License as - published by the Free Software Foundation; either version 2 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 - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include <time.h> -#include <libc-internal.h> - -#include "cpuclock-init.h" - - -/* This implementation uses the TSC register in modern (i586 and up) IA-32 - processors (most modern clones also provide it). Since we need the - resolution of the clock and since determining this is not cheap, we - cache the value. But this means that systems with processors running - at different speeds or process migration to machines with slower or - faster processors will not work without changes. */ - - -/* Clock frequency of the processor. We make it a 64-bit variable - because some jokers are already playing with processors with more - than 4GHz. */ -static unsigned long long int freq; - - -/* We need the starting time for the process. */ -CPUCLOCK_VARDECL (_dl_cpuclock_offset); - - -/* This function is defined in the thread library. */ -extern int __pthread_clock_gettime (unsigned long long int freq, - struct timespec *tp) - __attribute__ ((__weak__)); - - -/* We add an limitation here: we assume that the process is not - running as long as it takes to wrap-around the 64-bit timestamp - counter. On a 4GHz machine it would take 136 years of uptime to - wrap around so this "limitation" is not severe. */ -#define EXTRA_CLOCK_CASES \ - case CLOCK_THREAD_CPUTIME_ID: \ - if (__pthread_clock_gettime != NULL) \ - { \ - if (__builtin_expect (freq == 0, 0)) \ - { \ - /* This can only happen if we haven't initialized the `freq' \ - variable yet. Do this now. We don't have to protect this \ - code against multiple execution since all of them should \ - lead to the same result. */ \ - freq = __get_clockfreq (); \ - if (__builtin_expect (freq == 0, 0)) \ - /* Something went wrong. */ \ - break; \ - } \ - \ - retval = __pthread_clock_gettime (freq, tp); \ - break; \ - } \ - /* FALLTHROUGH */ \ - \ - case CLOCK_PROCESS_CPUTIME_ID: \ - { \ - unsigned long long int tsc; \ - \ - if (__builtin_expect (freq == 0, 0)) \ - { \ - /* This can only happen if we haven't initialized the `freq' \ - variable yet. Do this now. We don't have to protect this \ - code against multiple execution since all of them should \ - lead to the same result. */ \ - freq = __get_clockfreq (); \ - if (__builtin_expect (freq == 0, 0)) \ - /* Something went wrong. */ \ - break; \ - } \ - \ - /* Get the current counter. */ \ - asm volatile ("rdtsc" : "=A" (tsc)); \ - \ - /* Compute the offset since the start time of the process. */ \ - tsc -= _dl_cpuclock_offset; \ - \ - /* Compute the seconds. */ \ - tp->tv_sec = tsc / freq; \ - \ - /* And the nanoseconds. This computation should be stable until \ - we get machines with about 16GHz frequency. */ \ - tp->tv_nsec = ((tsc % freq) * 1000000000ull) / freq; \ - \ - retval = 0; \ - } \ - break; - -#include <sysdeps/unix/clock_gettime.c> |