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Quick-and-dirty way to ensure only one instance of a shell script is running at a time
...m -f ${LOCKFILE}; exit" INT TERM EXIT
echo $$ > ${LOCKFILE}
# do stuff
sleep 1000
rm -f ${LOCKFILE}
The trick here is the kill -0 which doesn't deliver any signal but just checks if a process with the given PID exists. Also the call to trap will ensure that the lockfile is removed even when ...
async/await - when to return a Task vs void?
...id AsyncMethod2(int num)
{
await Task.Factory.StartNew(() => Thread.Sleep(num));
}
Yes, use async and await here, they make sure your method still works correctly if an exception is thrown.
for more information see: http://msdn.microsoft.com/en-us/magazine/jj991977.aspx
...
Code for decoding/encoding a modified base64 URL
...n for Xamarin without having to pull in a library.
– Sleeping_Giant
Aug 2 '18 at 16:43
add a comment
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...
What is the need of JSF, when UI can be achieved with JavaScript libraries such as jQuery and Angula
... thing with powerful control over HTML.
– Plain_Dude_Sleeping_Alone
Jul 19 '15 at 21:29
add a...
load and execute order of scripts
...cript has been loaded and executed.
To test this fact:
// file: test.php
sleep(10);
die("alert('Done!');");
// HTML file:
<script type="text/javascript" src="test.php"></script>
Dynamically added scripts are executed as soon as they are appended to the document.
To test this fact:
...
Is it possible to read from a InputStream with a timeout?
...am.write(1);
outputStream.write(2);
Thread.sleep(5000);
outputStream.write(3);
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
};
executor.submit(writeTask);...
Download a file with Android, and showing the progress in a ProgressDialog
...urrentThread().isInterrupted()) {
try {
Thread.sleep(1000);
Message msg = new Message();
progress = getProgressPercentage();
handler.sendMessage(msg);
} catch (InterruptedException e) {
T...
Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragme
...ce the application isn't necessarily completely shut down (but just put to sleep in the background), the previous code i submitted would fail upon restarting the application. I've updated the code to something that works for me, both going in & out of the map and exiting and restarting the appli...
C# 5 async CTP: why is internal “state” set to 0 in generated code before EndAwait call?
...await m2;
}
async Task m2()
{
await m3();
}
async Task m3()
{
Thread.Sleep(10000);
}
Does the movenext delegate get called multiple times in this situation ?
Just a punt really?
share
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imp...
Asserting successive calls to a mock method
...: def __init__(self):
...: import time
...: time.sleep(2) # <- Spends a lot of time here
...:
...: def do_work(self, arg1, arg2):
...: print("Called with %r and %r" % (arg1, arg2))
...:
here is some code that uses two instances of the H...