- **status**: assigned --> accepted
---
** [tickets:#1208] IMM: Update README clarifying that augmented CCBs must be
kept pure**
**Status:** accepted
**Milestone:** 4.4.2
**Created:** Tue Nov 11, 2014 12:42 PM UTC by Anders Bjornerstedt
**Last Updated:** Mon Dec 08, 2014 06:24 AM UTC
**Owner:** Anders Bjornerstedt
When a ccb augmentation is started by an OI, the IMM server will disable
the OI timer that is normally monitoring an OI callback. The reason for this
is that the OI doing a ccb-augmentation is in eseence an om-client.
The purpose of the OI timeout is to detect if an OI gets hung for some reson
that does not involve the imm itself. While the OI is doing augment operations
it is using the OM-API that is itself monitored by the IMMA_SYNCR_TIMEOUT.
So the OI can not hang indefinitely on any such ccb augment downcalls.
But it must be clarified in the README that an OI performing an augmentation
must avoid doing "other things" than the augmentation operations. It should
stay "pure" and not interleave augmentation operations with other tasks.
Finally there is also a problem in that after an augmentation is completed,
but before the OI callback returns, then no OI timer is restored.
So an OI that hangs on some other operation inside the callback, but after
the ccb-augmentation has been closed, will hang for an indefinite time period.
In practice until the either the user closes the handle or the ccb gets aborted
due to an imm-.sync.
So in addition to the OI keeping the augmentation pure, the OI implementer
should try to do other tasks befor an augmentation, i.e. avoid doing anything
after an augmentation.
This last problem of an OI callback not being timer monitored after the close
of an augmentation is complex/expensive to fix. A fix for this will be done as
an enhancement and tracked by a spearate ticket.
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