/ SCCSID: @(#)lock.s 3.0 4/22/86 / ////////////////////////////////////////////////////////////////////// / Copyright (c) Digital Equipment Corporation 1984, 1985, 1986. / / All Rights Reserved. / / Reference "/usr/src/COPYRIGHT" for applicable restrictions. / ////////////////////////////////////////////////////////////////////// / / lock -- C library / lock(f) / modified to share same syscall as SYSTEM V plock / Bill Burns 3/20/85 .globl _lock, _plock, cerror .lock = 53. _plock: mov r5,-(sp) mov sp,r5 br 2f _lock: mov r5,-(sp) mov sp,r5 tst 4(r5) beq 2f mov $1000,4(r5) 2: mov 4(r5),0f sys 0; 9f .data 9: sys .lock; 0:.. .text bec 1f jmp cerror 1: clr r0 mov (sp)+,r5 rts pc