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    <p>By putting extra steps, and debugging outputs we figure out that there is a problem with the aio driver on our linux (<strong>5.3 Carthage, 2.6.18-128.el5</strong>)</p> <p>Solution we applied (I'm putting it in just in case someone runs in the the same problem) is this:<br/> <em>(We count elapsed seconds for a call outselves.)</em></p> <p>1) If we see an error returned from <code>io_getevents()</code> we report it. DONE.</p> <p>2) If we see 0 jobs finished and elapsed seconds we count ourselves went above expected one we report an error. DONE. Otherwise we continue (we do not change timeout on <code>io_getevents()</code>)</p> <p>3) If some jobs are finished, we analyze their <code>res</code> for an error (negative value), and if there was any failing job we report it. DONE.</p> <p>4) If there are some remaining jobs, we reset timer (yes, we will again wait 'expected' time) and continue.</p> <p>With this method we will report an error if <code>io_getevents()</code> reported an error or any of the jobs reported an error. In the worst case scenario, when each job returns ok after whole T-epsilon wait time, the whole process will take N * T time to complete.</p> <p>I hope someone will find it useful.<br/> Blessings,<br/> Greg.</p> <p>Example:</p> <pre><code>struct timespec tmCountStart ; unsigned seconds_delay = SECONDS_DELAY ; clock_gettime( CLOCK_REALTIME, &amp;tmCountStart ) ; while ( num_remaining_jobs &gt; 0 ) { struct timespec ts = { seconds_delay, 0 } ; struct io_event events[ num_remaining_jobs ] ; long ec ; do { ec = io_getevents( ctx, num_remaining_jobs, num_remaining_jobs, &amp;events[ 0 ], &amp;ts ) ; } while( ec == -EINTR ) ; if ( ec &lt; 0 ) throw exception reporting error ec. cancel all remaining jobs else if ( ec == 0 ) { const double elapsed = count elapsed seconds from tmCountStart seconds_delay = SECONDS_DELAY - static_cast&lt; unsigned &gt;( elapsed ) ; if ( seconds_delay &gt; SECONDS_DELAY ) throw exception reporting timeout. cancel all remaining jobs } else // we got some jobs back. may not all of them { for ( int i = 0 ; i &lt; ec ; i++ ) if (( int64_t )events[ i ].res &lt; 0 ) throw exception reporting failing job. cancel all remaining jobs. num_remaining_jobs -= ec ; if ( num_remaining_jobs &gt; 0 ) { clock_gettime( CLOCK_REALTIME, &amp;tmCountStart ) ; // reset timer. seconds_delay = SECONDS_DELAY ; } } } </code></pre>
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