Orphan control blocks
Resend: My original reply had subject line "Re: Orphan control blocks". Resending with original subject line. Sorry about that. This *may* be the classical problem described in Principles of Operation, SA22-7832-10. Look at the description of COMPARE AND SWAP and COMPARE DOUBLE AND SWAP beginning on page 7-127. In particular, note 4 in the Programming Notes on page 7-128 -- 7-129. Finally, Appendix A has sample code you should examine. See the "Free Pool Manipulation" section that begins on page A-50. Compare the code you supplied with the ADD TO FREE LIST Routine on page A-51. Regards, John Ganci -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Orphan control blocks
This *may* be the classical problem described in Principles of Operation, SA22-7832-10. Look at the description of COMPARE AND SWAP and COMPARE DOUBLE AND SWAP beginning on page 7-127. In particular, Note 4 in the Programming Notes on page 7-128 -- 7-129. Finally, Appendix A has sample code you should examine. See the "Free Pool Manipulation" section that begins on page A-50. Compare the code you supplied with the ADD TO FREE LIST Routine on page A-51. Regards, John Ganci -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Orphan control blocks
On 6/19/2017 11:51 AM, Donald Likens wrote: Does anyone see any problems with the following code... Updating free space pointer. To fully understand the possibilities for error you would need to show both sides of the processing, allocation and freeing. In cases like this there is almost always an unintended interaction between the two. Regards, Greg -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Orphan control blocks
Does anyone see any problems with the following code... Updating free space pointer. *C DO UNTIL SBLKFREE IS SET *C SET R6 = CSALSBLK.SBLKFREE (ADDRESS TO PUT STORAGE) LG R5,CSALSBLK 01-SBLK LG R6,SBLKFREE-MSBLKCB(,R5) 01-SBLK SBDOA0008DS 0H 01-SBLK *C SET R8 = CSALSBLK.SBLKFREE + ROUND() LGR R8,R6 01-SBLK AGR R8,R7 01-SBLK *C SET SBLKFREE = SBLKEOBA (SERIALIZED) *C* MAY PUT SBLKFREE PAST SBLKEOBA BUT WILL NOT USE IT, IF DOES (not likely in middle!) CSG R6,R8,SBLKFREE-MSBLKCB(R5) 01-SBLK *IF SBLKFREE = R6, STG R8 SBLKFREE BC4,SBDOA0008 ELSE GOTO SBDOA 01-SBLK It seems correct to me but I have one user that has problems with orphan control blocks once in a while and would like your thoughts. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
