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Why do pthreads’ condition variable functions require a mutex?

...iting for, is for 'some_data' to be non-null. If it is non-null the "first time", great, you're holding the mutex and can safely use the data. If you had a do/while loop you would miss the notification if someone signalled the condition variable before you waited on it (it's nothing like the events ...
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How do you delete an ActiveRecord object?

... 4 Answers 4 Active ...
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How to add a button to PreferenceScreen

Is there any way to add a button to the bottom of preferences screen and make them work correct when scrolling? 12 Answers ...
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Why start a shell command with a backslash?

Why is the command starting with \ ? This is the site where I saw it. 2 Answers 2 ...
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Access denied for user 'root@localhost' (using password:NO)

...ly when I start my mysql service again I face withthe exact error but this time with (using password:yes) what should I do? – Nasser Hadjloo Jun 8 '10 at 6:13 ...
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Associating enums with strings in C#

... I can't help thinking that reflecting the enum every time you want do display the text sounds kind of painful from a performance perspective! – Liath Sep 1 '14 at 15:03 ...
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PHP DOMDocument loadHTML not encoding UTF-8 correctly

...ent already had a conflicting declaration. Many thanks - saved me a lot of time chasing this down. – Peter Bagnall Jul 4 '13 at 12:43 1 ...
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How can I return to a parent activity correctly?

...d" and "singleTop" modes differ from each other in just one respect: Every time there's a new intent for a "standard" activity, a new instance of the class is created to respond to that intent. Each instance handles a single intent. Similarly, a new instance of a "singleTop" activity may also be cre...
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Why am I not getting a java.util.ConcurrentModificationException in this example?

...tor methods are fail-fast: if the list is structurally modified at any time after the iterator is created, in any way except through the iterator's own remove or add methods, the iterator will throw a ConcurrentModificationException. This check is done in the next() method of the iterator ...
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Is there XNOR (Logical biconditional) operator in C#?

I'm new to C# and could not find XNOR operator to provide this truth table: 4 Answers ...