/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #if !defined(_RESEARCH_SOURCE) && !defined(_PLAN9_SOURCE)   This header file is an extension of ANSI/POSIX#endif #ifndef __LOCK_H#define __LOCK_H#pragma lib "/$M/lib/ape/libap.a" #include <u.h> typedef struct{	long	key;	long	sem;} Lock; #ifdef __cplusplusextern "C" {#endif extern	void	lock(Lock*);extern	void	unlock(Lock*);extern	int	canlock(Lock*);extern	int	tas(int*); #ifdef __cplusplus}#endif #endif