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1 perry 1 CLOCK
2 !!!CLOCK
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 RETURN VALUE
7 CONFORMING TO
8 NOTES
9 SEE ALSO
10 ----
11 !!NAME
12
13
14 clock - Determine processor time
15 !!SYNOPSIS
16
17
18 __#include
19 __
20 !!DESCRIPTION
21
22
23 The __clock()__ function returns an approximation of
24 processor time used by the program.
25 !!RETURN VALUE
26
27
28 The value returned is the CPU time used so far as a
29 __clock_t__; to get the number of seconds used, divide by
30 __CLOCKS_PER_SEC__. If the processor time used is not
31 available or its value cannot be represented, the function
32 returns the value (clock_t)-1.
33 !!CONFORMING TO
34
35
36 ANSI C. POSIX requires that CLOCKS_PER_SEC equals 1000000
37 independent of the actual resolution.
38 !!NOTES
39
40
41 The C standard allows for arbitrary values at the start of
42 the program; subtract the value returned from a call to
43 __clock()__ at the start of the program to get maximum
44 portability.
45
46
47 Note that the time can wrap around. On a 32bit system where
48 CLOCKS_PER_SEC equals 1000000 this function will return the
49 same value approximately every 72 minutes.
50
51
52 The __times()__ function call returns more
53 information.
54 !!SEE ALSO
55
56
57 getrusage(2), times(2)
58 ----
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