[PATCH] Fix an abort in transaction_loop under transaction_loop_recovery test (bug 12580)

[Amitay Isaacs]

Hi,

What's the best practice when using tevent_queue with tevent_req?

comm_write_send/recv computation is used to send data to an fd.  There can
be multiple write requests occurring simultaneously, so comm_write_send
uses a tevent_queue to serialize all those requests.  However, what happens
if tevent_req which is in the queue is freed?  What's the best way to track
the queue entry corresponding to that tevent_req?

Here's an attempt to track tevent_req and corresponding tevent_queue_entry,
so when tevent_req is free'd, the corresponding tevent_queue_entry also
gets freed and the entry is removed from the queue.

Please review and push.

Amitay.
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