lock.h
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/* @(#) lock.h 1.2 1/27/86 17:47:07 */
/*ident "@(#)cfront:incl/sys/lock.h 1.2"*/
/*
* flags for locking procs and texts
*/
#define UNLOCK 0
#define PROCLOCK 1
#define TXTLOCK 2
#define DATLOCK 4
extern int plock (int);