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Why do pthreads’ condition variable functions require a mutex?
I’m reading up on pthread.h ; the condition variable related functions (like pthread_cond_wait(3) ) require a mutex as an argument. Why? As far as I can tell, I’m going to be creating a mutex just to use as that argument? What is that mutex supposed to do?
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Is C++ context-free or context-sensitive?
... (Grammar symbols may be either terminals or non-terminals).
This can be read as A → γ only in the context [α, β]. In a context-free (Type 2) grammar, α and β must be empty.
It turns out that you can also restrict grammars with the "monotonic" restriction, where every producti...
What modern C++ libraries should be in my toolbox? [closed]
...ACE
Boost.Asio
ICE
Testing
Boost.Test
Google Test
UnitTest++
doctest
Threading
Boost.Thread
Version Control
libgit2
Web Application Framework
CppCMS
Wt
XML
Libxml2
pugixml
RapidXml
TinyXML
Xerces-C++
Links to additional lists of open source C++ libraries:
http://en.cppreference....
What's the best way to parse a JSON response from the requests library?
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@Krishna_Oza data mirrors the structure of the JSON it's reading. For example, if the response is: [{"a": {...}}], data is a list, with list[0] == {'a': {...}}. If the response is {"a": "b", "c": "d"}, data is a dict. Does that answer your question?
– pswamina...
HTML5 check if audio is playing?
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While I am really late to this thread, I use this implementation to figure out if the sound is playing:
service.currentAudio = new Audio();
var isPlaying = function () {
return service.currentAudio
&& service.currentAudio.currentTime &g...
Performance optimization strategies of last resort [closed]
There are plenty of performance questions on this site already, but it occurs to me that almost all are very problem-specific and fairly narrow. And almost all repeat the advice to avoid premature optimization.
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Show pending migrations in rails
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How do you read the output of this command? If the status of a row is "down", does that mean it's a pending migration?
– Dennis
Feb 13 '15 at 15:00
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Android - How to get application name? (Not package name)
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while reading App Name from string.xml, sometimes, am getting junk characters. I dont know why ..Ex: स्कैनर
– harikrishnan
Oct 17 '16 at 9...
How can I use “” in javadoc without formatting?
... to use markdown, you can just surround it with backticks.
`A<B>C` reads a bit nicer than {@code A<B>C}
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Deleting folders in python recursively
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The command (given by Tomek) can't delete a file, if it is read only. therefore, one can use -
import os, sys
import stat
def del_evenReadonly(action, name, exc):
os.chmod(name, stat.S_IWRITE)
os.remove(name)
if os.path.exists("test/qt_env"):
shutil.rmtree('test/qt_en...