From 1418bf990e16ae15a4f3b7a8b38ac57a79e7f4dd Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Thu, 3 Jul 2003 08:51:46 +0000 Subject: Update. 2003-07-03 Ulrich Drepper * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_AT_CLKTCK): Define. * sysdeps/unix/sysv/linux/prof-freq.h: New file. --- sysdeps/unix/sysv/linux/prof-freq.c | 51 +++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/prof-freq.c (limited to 'sysdeps/unix/sysv/linux/prof-freq.c') diff --git a/sysdeps/unix/sysv/linux/prof-freq.c b/sysdeps/unix/sysv/linux/prof-freq.c new file mode 100644 index 0000000000..00e963556c --- /dev/null +++ b/sysdeps/unix/sysv/linux/prof-freq.c @@ -0,0 +1,51 @@ +/* Determine realtime clock frequency. + Copyright (C) 2003 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 "kernel-features.h" +#include + + +int +__profile_frequency (void) +{ +#ifdef __ASSUME_AT_CLKTCK + return GL(dl_clktck); +#else + if (GL(dl_clktck) != ) + return GL(dl_clktck); + + struct itimerval tim; + + tim.it_interval.tv_sec = 0; + tim.it_interval.tv_usec = 1; + tim.it_value.tv_sec = 0; + tim.it_value.tv_usec = 0; + + __setitimer (ITIMER_REAL, &tim, 0); + __setitimer (ITIMER_REAL, 0, &tim); + + if (tim.it_interval.tv_usec < 2) + return 0; + + return 1000000 / tim.it_interval.tv_usec; +#endif +} +libc_hidden_def (__profile_frequency) -- cgit 1.4.1