.NLIST	TOC,SYM
.TITLE	$LCKPG
.SBTTL	ULBLIB 024	- Routines to Set/Clear Page Status Bits
.IDENT	\V01.00\
.PSECT	.LIBC.
.ENABL	LC,GBL

; Copyright (c) 1998 by Mentec, Inc., Nashua, NH.
; All rights reserved
;
; This software is furnished under a license for use only on a
; single computer system and  may  be  copied  only  with  the
; inclusion of the above copyright notice.  This software,  or
; any other copies thereof, may not be provided  or  otherwise
; made available to any other person except for  use  on  such
; system and to one who agrees to these license  terms.  Title
; to  and  ownership of the software shall at all times remain
; in Mentec, Inc.
;
; The information in this document is subject to change without
; notice and should not be construed as a commitment by Digital
; Equipment Corporation, or Mentec, Inc.
;
; Digital and Mentec  assume  no  responsibility for the use or
; reliability of its software on equipment which is not supplied
; by Digital  or Mentec,  and listed  in the  Software  Product
; Description.
;+
; $LCKPG
; $UNLPG
; $WRMPG
; These routines set/clear the approriate bits in the page status byte
;
;	R1	= virtual address
;
;	CALL	routine
;
;	C-bit	= 0 => page was marked as requested
;
;	C-bit	= 1 => page was not resident
;-

$LCKPG::
	JSR	R2,$SAVVR	;Save volatile registers
	CALL	$FNDPG		;Find specified page
	BCS	1$		;If C-bit = 1, page not in memory
	INCB	P$GLOK(R0)	;Increment lock count
1$:	RETURN

$UNLPG::
	JSR	R2,$SAVVR	;Save volatile registers
	CALL	$FNDPG		;Find specified page
	BCS	1$		;If C-bit = 1, page not in memory
	DECB	P$GLOK(R0)	;Decrement lock count
1$:	RETURN

$WRMPG::
	JSR	R2,$SAVVR	;Save volatile registers
	CALL	$FNDPG		;Find specified page
	BCS	1$		;If C-bit = 1, not resident
	BISB	#PG$WRT,P$GSTS(R0) ;Write-mark page
1$:	RETURN

.END