Plan 9 from Bell Labs’s /usr/web/sources/contrib/quanstro/locktest/semlock.h

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Distributed under the MIT License.
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#define Lock SemLock
typedef
struct Lock {
	long	key;
	long	sem;
} Lock;
#define lock(xyz)		semlock(xyz)
#define unlock(xyz)	semunlock(xyz)
#define	canlock(xyz)	semcanlock(xyz)

extern	void	lock(Lock*);
extern	void	unlock(Lock*);
extern	int	canlock(Lock*);

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