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#include <u.h>
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#include <libc.h>
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#define	HZ	1000
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double
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cputime(void)
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{
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	long t[4];
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	int i;
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	times(t);
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	for(i=1; i<4; i++)
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		t[0] += t[i];
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	return t[0] / (double)HZ;
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}