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Copyright 1991 David Jurgens |
clock_t clock( void )
- prototype in time.h
- returns elapsed processor time used by the calling process,
or -1L on error
- C startup code retrieves the clock count as preparation for a
later call to clock() (Turbo C++ and some versions of MS C)
- resolution is limited to 54ms for both MS C and Turbo C due
to the dependency on INT 8 clock tics
- CLK_TCK is shouldn't be used unless CLOCKS_PER_SEC isn't available
since the latter is defined by ANSI.
- MS C uses INT 21,2C to get the processor time with 1000 as the
value of CLK_TCK
- Turbo C uses INT 1A,2 to get the processor time with 18 as the
value of CLK_TCK
- Example usage:
clock_t start, finish, duration;
start = clock();
delay(2000);
finish = clock();
duration = finish - start;
printf("%ld - %ld = %ld tics\n", start, finish, duration);
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clock |
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