The light bulb finally went off, ever so dimly. Now I think I got it. ATTACH can use an ECB that the Mother can wait on until Daughter ends. The POSTing of the ECB is done by the system upon completion of Daughter.
But, and this is what was so hard for me to get. Mother can pass Daughter an ECB for the Daughter task to use. Daughter does some stuff and then WAITs. Mother goes about her business until she needs Daughter do so something. <this is still fuzzy> Mother clears the ECB and POSTs it freeing Daughter from her slumber. "Get to work, you." Daughter does her thing and then WAITs for further instruction. Mother could also POST with a return code indicating that Daughter should just call it a night and end, whereas Mother could WAIT on the original ECB used with the0 ATTACH until Daughter comes back home. ECB's are used all over the place it seems, and are not just a control block used with ATTACH. I missed that, hence my confusion. Am I even close? This kept me up till 4:30 this morning. Lindy Things like "atomic" and "compare and swap" are still beyond me right now. I'll get it sooner or later. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of David Logan Sent: 20. tammikuuta 2008 18:55 To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? The bottom line is that one task needs to be suspended until some event occurs. WAIT causes MVS to suspend the task until the ECB is posted POST causes MVS to resume the task that has been waiting. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
