diff options
Diffstat (limited to 'sysdeps/unix')
| -rw-r--r-- | sysdeps/unix/i386/clock_getcpuclockid.c | 34 | ||||
| -rw-r--r-- | sysdeps/unix/i386/i586/clock_getres.c | 71 | ||||
| -rw-r--r-- | sysdeps/unix/i386/i586/clock_gettime.c | 71 | ||||
| -rw-r--r-- | sysdeps/unix/i386/i686/Implies | 1 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/bits/time.h | 75 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/get_clockfreq.c | 73 |
6 files changed, 325 insertions, 0 deletions
diff --git a/sysdeps/unix/i386/clock_getcpuclockid.c b/sysdeps/unix/i386/clock_getcpuclockid.c new file mode 100644 index 0000000000..1fd8ad9044 --- /dev/null +++ b/sysdeps/unix/i386/clock_getcpuclockid.c @@ -0,0 +1,34 @@ +/* Copyright (C) 2000 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 <errno.h> +#include <unistd.h> +#include <sys/time.h> + +int +clock_getcpuclockid (pid_t pid, clockid_t *clock_id) +{ + /* We don't allow any process ID but our own. */ + if (pid != 0 && pid != getpid ()) + return EPERM; + + /* Store the number. */ + *clock_id = __CLOCK_HIGHRES; + + return 0; +} diff --git a/sysdeps/unix/i386/i586/clock_getres.c b/sysdeps/unix/i386/i586/clock_getres.c new file mode 100644 index 0000000000..abafcc079b --- /dev/null +++ b/sysdeps/unix/i386/i586/clock_getres.c @@ -0,0 +1,71 @@ +/* Copyright (C) 1999, 2000 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 <sys/param.h> +#include <sys/time.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. */ + + +/* Function to determine processor frequency. */ +extern unsigned long long int __get_clockfreq (void); + +/* 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 long int nsec; + + +/* We add an limitation here: we assume that the machine is not up 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_HIGHRES: \ + { \ + if (__builtin_expect (nsec != 0, 0)) \ + { \ + unsigned long long int freq; \ + \ + /* 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; \ + \ + nsec = MAX (1000000000ULL / freq, 1); \ + } \ + \ + /* File in the values. The seconds are always zero (unless we \ + have a 1Hz machine). */ \ + res->tv_sec = 0; \ + res->tv_nsec = nsec; \ + \ + retval = 0; \ + } \ + break; + +#include <sysdeps/posix/clock_getres.c> diff --git a/sysdeps/unix/i386/i586/clock_gettime.c b/sysdeps/unix/i386/i586/clock_gettime.c new file mode 100644 index 0000000000..f623cecd09 --- /dev/null +++ b/sysdeps/unix/i386/i586/clock_gettime.c @@ -0,0 +1,71 @@ +/* Copyright (C) 1999, 2000 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 <sys/time.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. */ + + +/* Function to determine processor frequency. */ +extern unsigned long long int __get_glockfreq (void); + +/* 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 add an limitation here: we assume that the machine is not up 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_HIGHRES: \ + { \ + 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 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; \ + } \ + break; + +#include <sysdeps/unix/clock_gettime.c> diff --git a/sysdeps/unix/i386/i686/Implies b/sysdeps/unix/i386/i686/Implies new file mode 100644 index 0000000000..6f31c95d44 --- /dev/null +++ b/sysdeps/unix/i386/i686/Implies @@ -0,0 +1 @@ +unix/i386/i586 diff --git a/sysdeps/unix/sysv/linux/i386/bits/time.h b/sysdeps/unix/sysv/linux/i386/bits/time.h new file mode 100644 index 0000000000..dfd3afac11 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/bits/time.h @@ -0,0 +1,75 @@ +/* System-dependent timing definitions. Linux version. + Copyright (C) 1996, 1997, 1999, 2000 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. */ + +/* + * Never include this file directly; use <time.h> instead. + */ + +#ifndef __need_timeval +# ifndef _BITS_TIME_H +# define _BITS_TIME_H 1 + +/* ISO/IEC 9899:1990 7.12.1: <time.h> + The macro `CLOCKS_PER_SEC' is the number per second of the value + returned by the `clock' function. */ +/* CAE XSH, Issue 4, Version 2: <time.h> + The value of CLOCKS_PER_SEC is required to be 1 million on all + XSI-conformant systems. */ +# define CLOCKS_PER_SEC 1000000 + +# ifndef __STRICT_ANSI__ +/* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK + presents the real value for clock ticks per second for the system. */ +# define CLK_TCK 100 +# endif + +/* Clock ID used in clock and timer functions. */ +typedef int __clockid_t; + +/* Timer ID returned by `timer_create'. */ +typedef int __timer_t; + +# ifdef __USE_POSIX199309 +/* Identifier for system-wide realtime clock. */ +# define CLOCK_REALTIME 0 +/* High-resolution timer from the CPU. */ +# define __CLOCK_HIGHRES 1 + +/* Flag to indicate time is absolute. */ +# define TIMER_ABSTIME 1 +# endif + +# endif /* bits/time.h */ +#endif + +#ifdef __need_timeval +# undef __need_timeval +# ifndef _STRUCT_TIMEVAL +# define _STRUCT_TIMEVAL 1 +# include <bits/types.h> + +/* A time value that is accurate to the nearest + microsecond but also has a range of years. */ +struct timeval + { + __time_t tv_sec; /* Seconds. */ + __suseconds_t tv_usec; /* Microseconds. */ + }; +# endif /* struct timeval */ +#endif /* need timeval */ diff --git a/sysdeps/unix/sysv/linux/i386/get_clockfreq.c b/sysdeps/unix/sysv/linux/i386/get_clockfreq.c new file mode 100644 index 0000000000..28f56c8fc3 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/get_clockfreq.c @@ -0,0 +1,73 @@ +/* Get frequency of the system processor. i386/Linux version. + Copyright (C) 2000 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 <ctype.h> +#include <fcntl.h> +#include <unistd.h> + + +unsigned long long int +__get_clockfreq (void) +{ + /* We read the information from the /proc filesystem. It contains at + least one line like + cpu MHz : 497.840237 + We search for this line and convert the number in an integer. */ + unsigned long long int result = 0ull; + int fd; + + fd = open ("/proc/cpuinfo", O_RDONLY); + if (__builtin_expect (fd != -1, 1)) + { + /* XXX AFAIK the /proc filesystem can generate "files" only up + to a size of 4096 bytes. */ + char buf[4096]; + ssize_t n; + + n = read (fd, buf, sizeof buf); + if (__builtin_expect (n, 1) > 0) + { + char *mhz = memmem (buf, n, "cpu MHz", 7); + + if (__builtin_expect (mhz != NULL, 1)) + { + char *endp = buf + n; + + /* Search for the beginning of the string. */ + while (mhz < endp && (*mhz < '0' || *mhz > '9') && *mhz != '\n') + ++mhz; + + while (mhz < endp && *mhz != '\n') + { + if (*mhz >= '0' && *mhz <= '9') + { + result *= 10; + result += *mhz - '0'; + } + + ++mhz; + } + } + } + + close (fd); + } + + return result; +} |