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#include <u.h>
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#include <libc.h>
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#include <thread.h>
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static Lock l;
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void
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_xinc(long *p)
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{
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	lock(&l);
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	(*p)++;
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	unlock(&l);
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}
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long
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_xdec(long *p)
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{
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	long r;
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	lock(&l);
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	r = --(*p);
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	unlock(&l);
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	return r;
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}