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.VARIABLE TWENTY 2 1
\\
.LM0;.RM70;.F;.J;.FLAG CAP;.SP1;.TS5
<SRT4A.BWR -- ^BEWARE FILE FOR <SORT <V4B
.BR
^SEPTEMBER 1979
.FG30
^^COPYRIGHT (C) 1979 BY
.BR
DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.
.B2
THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND 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.  NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY
TRANSFERRED.
.B1
THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE
AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT
CORPORATION.
.B1
DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL\\.
.AUTOPARAGRAPH			!PARAGRAPHS START WITH A LEADING SPACE
.T <SRT4B.BWR -- ^BEWARE FILE FOR <SORT <V4B
.PARAGRAPH 0, 1, 1		!SET NORMAL PARAGRAPHING
.AUTOPARAGRAPH			!PARAGRAPHS START WITH A SPACE
.TAB STOPS 9, 17, 25, 33, 41, 49, 57, 63, 69  !USUAL TTY TABBING
.PG.LM0.RM70.SP1.F.J
.B3.LM0.RM70
.B 3
.IF TWENTY
.LITERAL
Digital Equipment Corporation       25-SEP-79    Page   2
PCO Log Report

[PCO Write-up]



                        **********


[SYMPTOM]
 
 
 
 
DUMPI  JSYS  in  no-wait  mode  has  inconsistent   actions.
Attempting   error   correction   using   GDSTS   is   often
unsuccessful when processing tapes.
 
 

                        **********


[DIAGNOSIS]
 
GDSTS JSYS waits for all pending I/O operations to complete.
Unfortunately,  the monitor is not aborting pending tape I/O
requests when an error such as illegal record length occurs.
This causes timing races and uncertain tape positioning.
 
 

                        **********


[CURE]
 
Abort  pending  I/O  at  interrupt  level  on   this   error
condition.
 

Digital Equipment Corporation       25-SEP-79    Page   3
PCO Log Report


[FILCOM]
@FILCOM]
@! PATCH TO THE RELEASE 3A MONITOR TO CORRECT THE OPERATION
@! OF THE DUMPI JSYS IN HANDLING ERROR CONDITIONS.  CAUSES
@! PENDING IORBS TO BE ABORTED AT INTERRUPT LEVEL.
@
@ENABLE (CAPABILITIES)
$GET SYSTEM:MONITR
$ST 140
DDT
 
MAGTAP$:
 
MTDINT+2/   MOVE B,0(A)   FFF$<
FFF/   0   MOVE T2,IRBCNT(T1)
FFF2+1/   0   HRRZ CX,MTIRSD+1(T1)
FFF2+2/   0   CAME T2,CX
FFF2+3/   0   JRST MTDINE+2$>
FFF2+4/   MOVE B,0(A)
FFF2+5/   JUMPA A,MTDINT+3
FFF2+6/   JUMPA B,MTDINT+4
MTDINT+2/   JUMPA FFF2
 
^Z
$SAVE SYSTEM:MONITR
 <SYSTEM>MONITR.EXE.2 Saved
$

[End PCO Write-up]
.END LITERAL
.ELSE TWENTY
^FILE IS EMPTY.
.ENDIF TWENTY
.B 3
^^[END OF SRT4B.BWR]\\