#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 typedef struct { long key; long sem; } Lock; #ifdef __cplusplus extern "C" { #endif extern void lock(Lock*); extern void unlock(Lock*); extern int canlock(Lock*); extern int tas(int*); #ifdef __cplusplus } #endif #endif