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Mutex example / tutorial? [closed]
...t acquire a lock on a mutex (clutching the door handle of the booth). Only then will a thread be able to run those lines of code (making the phone call).
Once the thread has executed that code, it should release the lock on the mutex so that another thread can acquire a lock on the mutex (other p...
How does “do something OR DIE()” work in PHP?
...
If the first statement returns true, then the entire statement must be true therefore the second part is never executed.
For example:
$x = 5;
true or $x++;
echo $x; // 5
false or $x++;
echo $x; // 6
Therefore, if your query is unsuccessful, it will evaluat...
Unable to forward search Bash history similarly as with CTRL-r
...\e[6~": history-search-backward
logout/login, type the first letters and then pgup or pgdown to search throughout history
ctrl-R search all lines containing words, whereas history-search-forward search lines beginning with words
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Vim: Move window left/right?
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@ostler.c create a vertical split, then create a horizontal split within one of the columns. Now use <c-w> r and it only cycles the two windows within the one vertical split.
– Chev
Dec 19 '13 at 18:08
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How to find the files that are created in the last hour in unix
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If the dir to search is srch_dir then either
$ find srch_dir -cmin -60 # change time
or
$ find srch_dir -mmin -60 # modification time
or
$ find srch_dir -amin -60 # access time
shows files created, modified or accessed in the last hour.
correction ...
Table Header Views in StoryBoards
...rst; I dragged it all the way to the bottom of the outline for that scene. Then, in a 2nd step, I could move it onto the table view.
– Daniel Schneller
Sep 23 '13 at 20:00
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Reverting a single file to a previous version in git [duplicate]
...on
git commit
(The checkout command first reads the file into the index, then copies it into the work tree, so there's no need to use git add to add it to the index in preparation for committing.)
If your file may not have a simple history (e.g. renames and copies), see VonC's excellent comment. ...
Minimal web server using netcat
...TP_VERSION=$(echo ${I[0]} |cut -d" " -f3)
If METHOD = "GET" ]; then
case "$REQUEST" in
"/") Message_Body="HTML formatted home page stuff"
;;
/who) Message_Body="HTML formatted results of who"
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Is there a way to auto-adjust Excel column widths with pandas.ExcelWriter?
... If you can't use index=False (because you have a multiindex on rows), then you can get the index level depth with df.index.nlevels and then use this to add on to your set column call: worksheet.set_column(idx+nlevels, idx+nlevels, max_len). Otherwise the length is calculated for the first colum...
What is the best way to use a HashMap in C++?
...you need ordering in your container and are fine with the O(log n) runtime then just use std::map.
Otherwise, if you really need a hash-table (O(1) insert/access), check out std::unordered_map, which has a similar to std::map API (e.g. in the above example you just have to search and replace map wi...