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- /* 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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #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 */
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