From baf051ca35b40c73e98f4b5246be50209cd966a6 Mon Sep 17 00:00:00 2001 From: Jeff Johnston Date: Thu, 27 Jun 2002 20:09:26 +0000 Subject: 2002-06-27 Jeff Johnston * libc/sys/linux/Makefile.am: Add new clock routines. * libc/sys/linux/Makefile.in: Regenerated. * libc/sys/linux/clock_getres.c: New file. * libc/sys/linux/clock_gettime.c: Ditto. * libc/sys/linux/clock_settime.c: Ditto. * libc/sys/linux/hp-timing.h: Ditto. * libc/sys/linux/libc-internal.h: Ditto. * libc/sys/linux/sysconf.c: Fix typo. * libc/sys/linux/include/time.h: New file. * libc/sys/linux/machine/hp-timing.h: New file. * libc/sys/linux/machine/i386/Makefile.am: Add new files. * libc/sys/linux/machine/i386/Makefile.in: Regenerated. * libc/sys/linux/machine/i386/get_clockfreq.c: New file. * libc/sys/linux/machine/i386/hp-timing.c: Ditto. * libc/sys/linux/machine/i386/hp-timing.h: Ditto. * libc/sys/linux/sys/linux_time.h: Ditto. * libc/sys/linux/sys/time.h: Remove include of and replace with . --- newlib/libc/sys/linux/clock_getres.c | 94 ++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 newlib/libc/sys/linux/clock_getres.c (limited to 'newlib/libc/sys/linux/clock_getres.c') diff --git a/newlib/libc/sys/linux/clock_getres.c b/newlib/libc/sys/linux/clock_getres.c new file mode 100644 index 000000000..8bf648f51 --- /dev/null +++ b/newlib/libc/sys/linux/clock_getres.c @@ -0,0 +1,94 @@ +/* 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 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include +#include +#include +#include +#include +#include + + +#if HP_TIMING_AVAIL +/* Clock frequency of the processor. */ +static long int nsec; +#endif + + +/* Get resolution of clock. */ +int +clock_getres (clockid_t clock_id, struct timespec *res) +{ + int retval = -1; + + switch (clock_id) + { + case CLOCK_REALTIME: + { + long int clk_tck = sysconf (_SC_CLK_TCK); + + if (__builtin_expect (clk_tck != -1, 1)) + { + /* This implementation assumes that the realtime clock has a + resolution higher than 1 second. This is the case for any + reasonable implementation. */ + res->tv_sec = 0; + res->tv_nsec = 1000000000 / clk_tck; + + retval = 0; + } + } + break; + +#if HP_TIMING_AVAIL + case CLOCK_PROCESS_CPUTIME_ID: + case CLOCK_THREAD_CPUTIME_ID: + { + if (__builtin_expect (nsec == 0, 0)) + { + hp_timing_t 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 (UINT64_C (1000000000) / 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; +#endif + + default: + __set_errno (EINVAL); + break; + } + + return retval; +} -- cgit v1.2.3