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Difference between dispatch_async and dispatch_sync on serial queue?
...k is finished whereas dispatch_async return after it is added to the queue and may not finished.
for this code
dispatch_async(_serialQueue, ^{ printf("1"); });
printf("2");
dispatch_async(_serialQueue, ^{ printf("3"); });
printf("4");
It may print 2413 or 2143 or 1234 but 1 always before 3
for ...
Detect if stdin is a terminal or pipe?
...
On POSIX there is no io.h and for isatty() you need to include unistd.h.
– maxschlepzig
Sep 29 '11 at 13:22
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Check a collection size with JSTL
...r Facelets:
<... xmlns:fn="http://java.sun.com/jsp/jstl/functions">
And use like this in your page:
<p>The length of the companies collection is: ${fn:length(companies)}</p>
So to test with length of a collection:
<c:if test="${fn:length(companies) gt 0}">
</c:if>
A...
Warning on “diff.renamelimit variable” when doing git push
I'm pushing the local commit to the remote git server and got the following warning messages:
2 Answers
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Difference between and text
... you more layout freedom over the design of the button. In all its intents and purposes, it seemed excellent at first, but various browser quirks make it hard to use at times.
In your example, IE6 will send text to the server, while most other browsers will send nothing. To make it cross-browser c...
Static link of shared library function in gcc
...is actually an executable in a special format
with entry points specified (and some sticky addressing issues
included). It does not have all the information needed to
link statically.
You can't statically link a shared library (or dynamically link a static one).
The flag -static will force the linke...
Python idiom to return first item or None
...last option is almost exactly what I'm looking for: it's clear, it works, and it doesn't require me to define a new function. I'd say "exactly" if the break were somehow not needed, because the risk of omitting it is not insignificant. But this approach has the ring of truth.
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How to install grunt and how to build script with it
...ing to install Grunt on Windows 7 64 bit. I have installed Grunt using commands
4 Answers
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MySql Table Insert if not exist otherwise update
... description bugs.mysql.com/bug.php?id=58637
– broadband
Sep 2 '14 at 13:28
1
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How do I find numeric columns in Pandas?
Let's say df is a pandas DataFrame.
I would like to find all columns of numeric type.
Something like:
11 Answers
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