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How to track child process using strace?
...nux box.
$ ./strace-graph /srv/tftp/app.trc
(anon)
+-- touch /tmp/ppp.sleep
+-- killall -HUP pppd
+-- amixer set Speaker 70%
+-- amixer set Speaker 70%
+-- amixer set Speaker 70%
+-- amixer set Speaker 70%
+-- amixer set Speaker 50%
+-- amixer set Speaker 70%
`-- amixer set Spea...
Center content of UIScrollView when smaller
...etc. but nothing worked great (as everyone else has found out too).
After sleeping on it, I tried a couple of alternative angles:
Subclassing the UIImageView so it alters it's own size dynamically - this didn't work well at all.
Subclassing the UIScrollView so it alters it's own contentOffset dyn...
How to modify a global variable within a function in bash?
...e while the _passback x is running.
You can see this yourself if you add a sleep 1; before printf or _passback.
_xcapture a d; echo then outputs x or a first, respectively.
The _passback x should not be part of _xcapture,
because this makes it difficult to reuse that recipe.
Also we have some unned...
How can I do division with variables in a Linux shell?
...y find useful:
start=`date +%s`
# ... do something that takes a while ...
sleep 71
end=`date +%s`
let deltatime=end-start
let hours=deltatime/3600
let minutes=(deltatime/60)%60
let seconds=deltatime%60
printf "Time spent: %d:%02d:%02d\n" $hours $minutes $seconds
Another simple example - calculat...
Hidden Features of PHP? [closed]
...as of PHP 5.3
// on serialize() / unserialize()
public function __sleep();
public function __wakeup();
// conversion to string (e.g. with (string) $obj, echo $obj, strlen($obj), ...)
public function __toString();
// calling the object like a function (e.g. $obj($arg, $arg2...
Practical uses for the “internal” keyword in C#
...
so you don't lock your door when you sleep, because you've never heard of a thief stopped by a lock?
– Sergio
Jul 5 '17 at 22:07
4
...
When to use actors instead of messaging solutions such as WebSphere MQ or Tibco Rendezvous?
...r.class)));
producer.tell("Produce", probe.ref());
Thread.sleep(1000);
}
}
class Producer extends UntypedProducerActor{
@Override
public String getEndpointUri() {
return "activemq:foo.bar";
}
}
class Consumer extends UntypedConsumerActor{
@Override
...
How the single threaded non blocking IO model works in Node.js
...request to thread pool. It can accept more requests as it does not wait or sleep. SQL queries/HTTP requests/file system reads all happen this way.
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How many concurrent AJAX (XmlHttpRequest) requests are allowed in popular browsers?
...r delay)!!!!
*/
$r = (int)$_GET['r'];
$w = (int)$_GET['w'];
if($r) {
sleep($w);
echo json_encode($_GET);
die ();
} //else
?><head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/ja...
Lock-free multi-threading is for real threading experts
...he it will run fast. A cache miss is really expensive, it puts the CPU to sleep for as many as 10 cycles if the data is not in the 1st cache, as many as 200 cycles if it isn't in the 2nd cache and it needs to be read from RAM.
Every CPU core has its own cache, they store their own "view" of RAM. ...