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Why does pthread_cond_wait have spurious wakeups?
...t;Kaz Kylheku wrote:
> >: It is so because implementations can sometimes not avoid inserting
> >: these spurious wakeups; it might be costly to prevent them.
> >But why? Why is this so difficult? For example, are we talking about
> >situations where a wait times out j...
Why can't variable names start with numbers?
... numbers which started with A-F and ended with h. Tripped me up the first time I tried to define a label to point to the music data for Bach's Two Part Invention #13 (logical name? Bach).
– supercat
Nov 20 '12 at 17:52
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Mercurial error: abort no username supplied
Problem on WindowsXP (likely will happen on all Win installs), first time using Mercurial. I found the answer in an inobvious place so I'm asking/answering the question myself so others don't have to search like I did.
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What is the easiest way to push an element to the beginning of the array?
I can't think of a one line way to do this. Is there a way?
6 Answers
6
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django models selecting single field
I have a table/models called Employees and I would like to get all rows of a single field as a queryset.
5 Answers
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Building a notification system [closed]
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(Add time fields where you see fit)
This is basically for grouping changes per object, so that you could say "You have 3 friend requests". And grouping per actor is useful, so that you could say "User James Bond made changes in y...
How can I ssh directly to a particular directory?
..., but it's a tad bit more verbose, and you have to remember to do it every time (unless you make an alias) so it seems a bit less "fun".
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What is the point of “final class” in Java?
...classes. So, if you call a.x() and a is declared final, we know at compile-time what the code will be and can inline into the calling function. I have no idea whether this is actually done, but with final it is a possibility.
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What's the difference between lists and tuples?
What's the difference?
20 Answers
20
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How to show math equations in general github's markdown(not github's blog)
After investigating, I've found mathjax can do this. But when I write some example in my markdown file, it doesn't show the correct equations:
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