mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 23:30:07 +00:00
83 lines
3.0 KiB
C
83 lines
3.0 KiB
C
/* High precision, low overhead timing functions. Generic version.
|
|
Copyright (C) 1998, 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
|
|
|
|
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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _HP_TIMING_H
|
|
#define _HP_TIMING_H 1
|
|
|
|
|
|
/* There are no generic definitions for the times. We could write something
|
|
using the `gettimeofday' system call where available but the overhead of
|
|
the system call might be too high.
|
|
|
|
In case a platform supports timers in the hardware the following macros
|
|
and types must be defined:
|
|
|
|
- HP_TIMING_AVAIL: test for availability.
|
|
|
|
- HP_TIMING_INLINE: this macro is non-zero if the functionality is not
|
|
implemented using function calls but instead uses some inlined code
|
|
which might simply consist of a few assembler instructions. We have to
|
|
know this since we might want to use the macros here in places where we
|
|
cannot make function calls.
|
|
|
|
- hp_timing_t: This is the type for variables used to store the time
|
|
values.
|
|
|
|
- HP_TIMING_ZERO: clear `hp_timing_t' object.
|
|
|
|
- HP_TIMING_NOW: place timestamp for current time in variable given as
|
|
parameter.
|
|
|
|
- HP_TIMING_DIFF_INIT: do whatever is necessary to be able to use the
|
|
HP_TIMING_DIFF macro.
|
|
|
|
- HP_TIMING_DIFF: compute difference between two times and store it
|
|
in a third. Source and destination might overlap.
|
|
|
|
- HP_TIMING_ACCUM: add time difference to another variable. This might
|
|
be a bit more complicated to implement for some platforms as the
|
|
operation should be thread-safe and 64bit arithmetic on 32bit platforms
|
|
is not.
|
|
|
|
- HP_TIMING_ACCUM_NT: this is the variant for situations where we know
|
|
there are no threads involved.
|
|
|
|
- HP_TIMING_PRINT: write decimal representation of the timing value into
|
|
the given string. This operation need not be inline even though
|
|
HP_TIMING_INLINE is specified.
|
|
|
|
*/
|
|
|
|
/* Provide dummy definitions. */
|
|
#define HP_TIMING_AVAIL (0)
|
|
#define HP_TIMING_INLINE (0)
|
|
typedef int hp_timing_t;
|
|
#define HP_TIMING_ZERO(Var)
|
|
#define HP_TIMING_NOW(var)
|
|
#define HP_TIMING_DIFF_INIT()
|
|
#define HP_TIMING_DIFF(Diff, Start, End)
|
|
#define HP_TIMING_ACCUM(Sum, Diff)
|
|
#define HP_TIMING_ACCUM_NT(Sum, Diff)
|
|
#define HP_TIMING_PRINT(Buf, Len, Val)
|
|
|
|
/* Since this implementation is not available we tell the user about it. */
|
|
#define HP_TIMING_NONAVAIL 1
|
|
|
|
#endif /* hp-timing.h */
|