35 lines
623 B
C
35 lines
623 B
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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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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}
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