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Why can't I use the 'await' operator within the body of a lock statement?
...d resumes. That arbitrary code could be taking out locks that produce lock ordering inversions, and therefore deadlocks.
Worse, the code could resume on another thread (in advanced scenarios; normally you pick up again on the thread that did the await, but not necessarily) in which case the unlock ...
Collection that allows only unique items in .NET?
...at contains no duplicate elements, and whose elements are in no particular order.
Note that the HashSet<T>.Add(T item) method returns a bool -- true if the item was added to the collection; false if the item was already present.
...
How do I get user IP address in django?
... on the Internet
else:
# The client's IP address is private
# Order of precedence is (Public, Private, Loopback, None)
Advanced Usage:
Custom Header - Custom request header for ipware to look at:
i, r = get_client_ip(request, request_header_order=['X_FORWARDED_FOR'])
i, r = get_cli...
'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine
...application.
If you have built your project under x86 platform, then in order to
resolve you issue you should install the following packages on your
machine:
In order to use the 'Microsoft.ACE.OLEDB.12.0' provider you must
install the Microsoft Access Database Engine 2010 Redistributable
first...
Are static class instances unique to a request or a server in ASP.NET?
...ferent requests may or may not be handled by the same worker process.
In order to share data with a specific user and across requests, use HttpContext.Current.Session.
In order to share data within a specific request, use HttpContext.Current.Items.
In order to share data across the entire applicat...
Avoid synchronized(this) in Java?
...angerous. You've now introduced a client-side (user's of this class) lock ordering requirement. If two threads are calling method1() and method2() in a different order, they are likely to deadlock, but the user of this class has no idea that this is the case.
– daveb
...
Which is faster/best? SELECT * or SELECT column1, colum2, column3, etc
...nificant practical reason is that it forces the user to magically know the order in which columns will be returned. It's better to be explicit, which also protects you against the table changing, which segues nicely into...
If a column name you're using changes, it's better to catch it early (at the...
Git: how to reverse-merge a commit?
...it show <merge commit SHA1> to see the parents, the numbering is the order they appear e.g. Merge: e4c54b3 4725ad2
git merge documentation:
http://schacon.github.com/git/git-merge.html
git merge discussion (confusing but very detailed):
http://schacon.github.com/git/howto/revert-a-faulty-me...
What is q=0.5 in Accept* HTTP headers?
...
Very nice, thanks! But why not just list them in the order of preference?
– kolypto
Dec 18 '11 at 16:12
9
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how to check the dtype of a column in python pandas
...y of the question is specific. So any other answers may be used.
But in order to fully answer the title question it should be clarified that it seems like all of the approaches may fail in some cases and require some rework. I reviewed all of them (and some additional) in decreasing of reliabilit...