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+/* High precision, low overhead timing functions. Generic version.
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+ Copyright (C) 1998, 2000 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, write to the Free
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+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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+ 02111-1307 USA. */
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+
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+#ifndef _HP_TIMING_H
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+#define _HP_TIMING_H 1
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+
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+
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+/* There are no generic definitions for the times. We could write something
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+ using the `gettimeofday' system call where available but the overhead of
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+ the system call might be too high.
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+
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+ In case a platform supports timers in the hardware the following macros
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+ and types must be defined:
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+
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+ - HP_TIMING_AVAIL: test for availability.
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+
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+ - HP_TIMING_INLINE: this macro is non-zero if the functionality is not
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+ implemented using function calls but instead uses some inlined code
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+ which might simply consist of a few assembler instructions. We have to
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+ know this since we might want to use the macros here in places where we
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+ cannot make function calls.
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+
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+ - hp_timing_t: This is the type for variables used to store the time
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+ values.
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+
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+ - HP_TIMING_ZERO: clear `hp_timing_t' object.
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+
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+ - HP_TIMING_NOW: place timestamp for current time in variable given as
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+ parameter.
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+
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+ - HP_TIMING_DIFF_INIT: do whatever is necessary to be able to use the
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+ HP_TIMING_DIFF macro.
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+
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+ - HP_TIMING_DIFF: compute difference between two times and store it
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+ in a third. Source and destination might overlap.
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+
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+ - HP_TIMING_ACCUM: add time difference to another variable. This might
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+ be a bit more complicated to implement for some platforms as the
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+ operation should be thread-safe and 64bit arithmetic on 32bit platforms
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+ is not.
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+
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+ - HP_TIMING_ACCUM_NT: this is the variant for situations where we know
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+ there are no threads involved.
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+
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+ - HP_TIMING_PRINT: write decimal representation of the timing value into
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+ the given string. This operation need not be inline even though
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+ HP_TIMING_INLINE is specified.
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+
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+*/
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+
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+/* Provide dummy definitions. */
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+#define HP_TIMING_AVAIL (0)
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+#define HP_TIMING_INLINE (0)
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+typedef int hp_timing_t;
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+#define HP_TIMING_ZERO(Var)
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+#define HP_TIMING_NOW(var)
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+#define HP_TIMING_DIFF_INIT()
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+#define HP_TIMING_DIFF(Diff, Start, End)
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+#define HP_TIMING_ACCUM(Sum, Diff)
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+#define HP_TIMING_ACCUM_NT(Sum, Diff)
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+#define HP_TIMING_PRINT(Buf, Len, Val)
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+
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+/* Since this implementation is not available we tell the user about it. */
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+#define HP_TIMING_NONAVAIL 1
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+
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+#endif /* hp-timing.h */
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Mike Frysinger