70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
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/* NetWare can not use this implementation of clock, since it does not
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have times or any similar function. It provides its own version of
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clock in clib.nlm. If we can not use clib.nlm, then we must write
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clock in sys/netware. */
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#ifdef CLOCK_PROVIDED
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int _dummy_clock = 1;
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#else
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/*
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* clock.c
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* Original Author: G. Haley
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*
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* Determines the processor time used by the program since invocation. The time
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* in seconds is the value returned divided by the value of the macro CLK_TCK.
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* If the processor time used is not available, (clock_t) -1 is returned.
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*/
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/*
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FUNCTION
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<<clock>>---cumulative processor time
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INDEX
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clock
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ANSI_SYNOPSIS
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#include <time.h>
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clock_t clock(void);
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TRAD_SYNOPSIS
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#include <time.h>
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clock_t clock();
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DESCRIPTION
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Calculates the best available approximation of the cumulative amount
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of time used by your program since it started. To convert the result
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into seconds, divide by the macro <<CLOCKS_PER_SEC>>.
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RETURNS
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The amount of processor time used so far by your program, in units
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defined by the machine-dependent macro <<CLOCKS_PER_SEC>>. If no
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measurement is available, the result is <<-1>>.
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PORTABILITY
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ANSI C requires <<clock>> and <<CLOCKS_PER_SEC>>.
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Supporting OS subroutine required: <<times>>.
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*/
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#include <time.h>
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#include <sys/times.h>
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#include <reent.h>
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clock_t
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clock ()
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{
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struct tms tim_s;
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clock_t res;
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if ((res = (clock_t) _times_r (_REENT, &tim_s)) != -1)
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res = (clock_t) (tim_s.tms_utime + tim_s.tms_stime +
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tim_s.tms_cutime + tim_s.tms_cstime);
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return res;
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}
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#endif /* CLOCK_PROVIDED */
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