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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_100
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161_01
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document.d
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###do.mp
.ds F USER MANUAL
.NM DO "repetitive timing macros"
.SY
#include "timer1.h"
DO_IEXPR(comment) \f2\s10integer_expression\f6\s8 OD;
DO_FEXPR(comment) \f2\s10floating_expression\f6\s8 OD;
DO_STMT(comment) \f2\s10statement\f6\s8 OD;
DO_SKIP(comment) \f2\s10statement\f6\s8 OD;
char *comment;
.FU
The DO macro generates a loop around the code sample which
executes it enough times to give 100 clock-tick samples for
the code sample.
The comment is printed on the timing report, along with the
space requirement and CPU time for the code sample.
The DO_SKIP macro simply place-holds a report output line.
.MN
###do.mpo
DO USER MANUAL DO
NAME
DO - repetitive timing macro
SYNOPSIS
#include "timer1.h"
DO_IEXPR(comment) integer_expression OD;
DO_FEXPR(comment) floating_expression OD;
DO_STMT(comment) statement OD;
char *comment;
DO_SKIP(comment) statement OD;
FUNCTION
The DO macro generates a loop around the code sample which
executes it enough times to give 100 clock-tick samples for
the code sample.
The comment is printed on the timing report, along with the
space requirement and CPU time for the code sample.
The DO_SKIP macro simply place-holds a report output line.
###cputim.mp
.ds F USER MANUAL
.NM cputim "report CPU time since last call"
.SY
#include "cputim.h"
cputim_t cputim()
.FU
.PT cputim
tells how many clock ticks have elapsed since the
previous invocation.
The resolution of the CPU clock is system-dependent.
On UNIX/Idris, it is 1/60 second.
The header \f6"cputim.h"\f1 provides a defined constant named
.PT CLOCK_TICKS_PER_SECOND .
.MN
###cputim.mpo
cputim USER MANUAL cputim
NAME
cputim - report CPU time since last call
SYNOPSIS
long cputim()
char *returnp(argp)
char *argp;
FUNCTION
Cputim tells how many clock ticks have elapsed since the pre-
vious invocations. Its format is intended for portability
between operating systems.
Returnp tells the address to which its calling function will
return. It is passed the address of the first argument of the
calling function. The location of the return pointer relative
to the first argument may be different on different systems;
therefore, the implementation of returnp may need tailoring to
each system.
BUGS
The resolution of the CPU clock is system-dependent. On
UNIX/Idris, it is 1/60 second.
###returnp.mp
.ll 66
.lt 66
.ds F USER MANUAL
.hy 15
.NM returnp "reveal a function's return pointer"
int *returnp(pa)
int **pa;
.FU
.IT
returnp
tells the address to which its calling function will
return.
The argument passed to
.IT
returnp
is system-dependent; it may be the address of the function's
first argument, or the address of the function's first auto
variable.
The location of the return pointer
may be different on different systems;
therefore, the implementation of returnp may need tailoring
to each system.
(Some simple customization is found in
.IT
"config.h".)
###returnp.mpo
returnp USER MANUAL returnp
NAME
returnp - reveal a function's return pointer
SYNOPSIS
int *returnp(pa)
int **pa;
FUNCTION
returnp_______ tells the address to which its calling function will
return. The argument passed to returnp_______ is system-dependent;
it may be the address of the function's first argument, or the
address of the function's first auto variable. The location
of the return pointer may be different on different systems;
therefore, the implementation of returnp may need tailoring to
each system. (Some simple customization is found in
"config______.h_".)
###EOF