> 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.

NO!!!! Mother does not clear the ECB. Mother just issues POST against
the ECB and the system does the rest. Clearing the ECB would cause the
POST to fail.

> 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.

As in horshoes? Yes. The ECB is one of the most widely used "tools" in
the system. As a serialization primitive it is just awful, but there's
no getting away from it now.

CC

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