[ofw] anyone know about events and overlapped I/O?

[Anatoly Greenblatt]

I think you should have an event for each i/o struct and call to
waitformultipleobjects.

Anatoly.
 
-----Original Message-----
From: ofw-bounces at lists.openfabrics.org
[mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of Sean Hefty
Sent: Wednesday, March 04, 2009 20:51
To: ofw at lists.openfabrics.org
Subject: [ofw] anyone know about events and overlapped I/O?

Does anyone know if it's safe for multiple overlapped I/O operations to
reference the same event?  I bring this up because I'm trying to do just
this,
and my application hangs waiting for events.  I'm using manual reset
events,
though I've tried with auto-reset as well.

As a point of reference, this is in the documentation for the hEvent
field in
the OVERLAPPED structure:

"Functions such as ReadFile and WriteFile set this handle to the
nonsignaled
state before they begin an I/O operation. When the operation has
completed, the
handle is set to the signaled state."  This makes me think that it's
possible to
lose events if shared between overlapped structures.

Although under the Remarks section it states: "You should also create an
event
object for each thread that processes data."  This makes me think that
it's
doable.

- Sean

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