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Quick-and-dirty way to ensure only one instance of a shell script is running at a time
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Here's an implementation that uses a lockfile and echoes a PID into it. This serves as a protection if the process is killed before removing the pidfile:
LOCKFILE=/tmp/lock.txt
if [ -e ${LOCKFILE} ] && kill -0 `cat ${LOCKFILE}`; then
echo "already running"
exit
fi
# mak...
Checking for empty arrays: count vs empty
...on I would say that count is O(1), since PHP stores the number of elements internally. Check out this answer stackoverflow.com/a/5835419/592454
– elitalon
May 21 '12 at 13:03
4
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“ArrayAdapter requires the resource ID to be a TextView” xml problems
...e List<MyEntity> values;
public SpinnerAdapter(Context context, int textViewResourceId,
List<MyEntity> values) {
//Pass in the resource id: R.id.text_view
super(context, textViewResourceId, values);
this.context = context;
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Does pandas iterrows have performance issues?
...ply usually can be handled by an iterator in Cython space. This is handled internally by pandas, though it depends on what is going on inside the apply expression. For example, df.apply(lambda x: np.sum(x)) will be executed pretty swiftly, though of course, df.sum(1) is even better. However somethin...
How to check whether an object has certain method/property?
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It is an old question, but I just ran into it.
Type.GetMethod(string name) will throw an AmbiguousMatchException if there is more than one method with that name, so we better handle that case
public static bool HasMethod(this object objectToCheck, string methodN...
Guava: Why is there no Lists.filter() function?
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You can use Iterables.filter, which will definitely maintain ordering.
Note that by constructing a new list, you'll be copying the elements (just references, of course) - so it won't be a live view onto the original list. Creating a view would be pretty tricky - consider this s...
Using Mockito's generic “any()” method
I have an interface with a method that expects an array of Foo :
4 Answers
4
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Why main does not return 0 here?
...undefined.
You can enable it by passing -std=c99 to gcc.
As a side note, interestingly 9 is returned because it's the return of printf which just wrote 9 characters.
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When should we use intern method of String on String literals
According to String#intern() , intern method is supposed to return the String from the String pool if the String is found in String pool, otherwise a new string object will be added in String pool and the reference of this String is returned.
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Beyond Stack Sampling: C++ Profilers
...rofiler output (AQtime, Sleepy, XPerf, etc). Once the visualization has pointed out the offending function(s), jump back to the raw profile data to get better hints on what the real cause is.
The gprof2dot tool generates a dot graph description that you then feed into a graphviz tool. The output i...