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App Inventor 2 字典代码块 · App Inventor 2 中文网
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What is a mutex?
...ople hoilding the mu.. chicken are competing threads. The Moderator is the OS. When people requests the chicken, they do a lock request. When you call mutex.lock(), your thread stalls in lock() and makes a lock request to the OS. When the OS detects that the mutex was released from a thread, it mere...
How can I shuffle the lines of a text file on the Unix command line or in a shell script?
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You can use shuf. On some systems at least (doesn't appear to be in POSIX).
As jleedev pointed out: sort -R might also be an option. On some systems at least; well, you get the picture. It has been pointed out that sort -R doesn't really shuffle but instead sort items according to their hash ...
What's the meaning of Base SDK, iOS deployment target, Target, and Project in xcode
...base SDK to 7, what does it mean? It could mean that the app would run on iOS 7. But that's what iOS deployment target is for.
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How to fix “containing working copy admin area is missing” in SVN?
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fwiw, I had a similar situation and used svn --force delete __dir__. That solved the issue for...
What is memory fragmentation?
...and you can't, even though you appear to have enough memory free. Another possible consequence is the inability of the process to release memory back to the OS (because each of the large blocks it has allocated from the OS, for malloc etc. to sub-divide, has something left in it, even though most of...
What is the difference between connection and read timeout for sockets?
...nite loop, but the attempt to connect can be unblocked by another thread closing the socket. (A Thread.interrupt() call may also do the trick ... not sure.)
3) What does read timeout set to "infinity" mean? In what situation can it remain in an infinite loop? What can trigger that the infinite...
Unable to show a Git tree in terminal
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git log --oneline --decorate --all --graph
A visual tree with branch names included.
Use th...
what happens when you type in a URL in browser [closed]
...is is an extremely rough and oversimplified sketch, assuming the simplest possible HTTP request (no HTTPS, no HTTP2, no extras), simplest possible DNS, no proxies, single-stack IPv4, one HTTP request only, a simple HTTP server on the other end, and no problems in any step. This is, for most contempo...
Convert javascript array to string
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Converting From Array to String is So Easy !
var A = ['Sunday','Monday','Tuesday','Wednesday'...