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What is a deadlock?

...s try to access the same resource at the same time. One process loses out and must wait for the other to finish. A deadlock occurs when the waiting process is still holding on to another resource that the first needs before it can finish. So, an example: Resource A and resource B are used by pro...
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Brew doctor says: “Warning: /usr/local/include isn't writable.”

... Take ownership of it and everything in it. Mac OS High Sierra or newer: (ty to Kirk in the comments below) $ sudo chown -R $(whoami) $(brew --prefix)/* Previous versions of macos: $ sudo chown -R $USER:admin /usr/local/include Then do anot...
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Generating a SHA-256 hash from the Linux command line

... On OSX, it might be handy to create an alias: alias sha256sum='shasum --algorithm 256' – Jonathan Cross Jun 4 '16 at 13:21 1 ...
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Understanding reference counting with Cocoa and Objective-C

I'm just beginning to have a look at Objective-C and Cocoa with a view to playing with the iPhone SDK. I'm reasonably comfortable with C's malloc and free concept, but Cocoa's references counting scheme has me rather confused. I'm told it's very elegant once you understand it, but I'm just not o...
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install / uninstall APKs programmatically (PackageManager vs Intents)

My application installs other applications, and it needs to keep track of what applications it has installed. Of course, this could be achieved by simply keeping a list of installed applications. But this should not be necessary! It should be the responsibility of the PackageManager to maintain the ...
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Are memory leaks ever ok? [closed]

...ever OK to do this?" but rather "Is there ever a good reason to do this?" And "hunting down that memory leak is a pain" isn't a good reason. I like to keep things simple. And the simple rule is that my program should have no memory leaks. That makes my life simple, too. If I detect a memory lea...
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How to get screen dimensions as pixels in Android

I created some custom elements, and I want to programmatically place them to the upper right corner ( n pixels from the top edge and m pixels from the right edge). Therefore I need to get the screen width and screen height and then set position: ...
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Programmatically generate video or animated GIF in Python?

...d not using images2gif from visvis because it has problems with PIL/Pillow and is not actively maintained (I should know, because I am the author). Instead, please use imageio, which was developed to solve this problem and more, and is intended to stay. Quick and dirty solution: import imageio im...
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How can I get a list of locally installed Python modules?

...is solution applies to the system scope or to a virtual environment scope, and covers packages installed by setuptools, pip and (god forbid) easy_install. My use case I added the result of this call to my flask server, so when I call it with http://example.com/exampleServer/environment I get the l...
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Android Studio quick documentation always “fetching documentation”

I just move to Android studio from eclipse,I found that it always shows "fetching documentation" when I use quick documentation(Ctrl+Q),How to solve this?(I download documentation for API19,still problem) ...