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Mutex example / tutorial? [closed]
...le concurrently, we have potential for a race condition. Consider the following code
//somewhere long ago, we have i declared as int
void my_concurrently_called_function()
{
i++;
}
The internals of this function look so simple. It's only one statement. However, a typical pseudo-assembly languag...
Collections.emptyMap() vs new HashMap()
...sing a Collection instead of null to avoid Exceptions being thrown on following operations? Using an immutable collection would just result in some other sort of exception I imagine. And assigning null is most certainly not less efficient than assigning a immutable constant.
– ...
Why do pthreads’ condition variable functions require a mutex?
...ed before you do a wait.
The wait will "atomically" unlock the mutex, allowing others access to the condition variable (for signalling). Then when the condition variable is signalled or broadcast to, one or more of the threads on the waiting list will be woken up and the mutex will be magically loc...
Performance optimization strategies of last resort [closed]
...t's hard to sample, so I give it 10 times as much work to do, but the following times are based on the original workload.
More diagnosis reveals that it is spending time in queue-management. In-lining these reduces the time to 7 seconds.
Now a big time-taker is the diagnostic printing I had been d...
Difference between modes a, a+, w, w+, and r+ in built-in open function?
...ows:
The argument mode points to a string beginning with one of the following
sequences (Additional characters may follow these sequences.):
``r'' Open text file for reading. The stream is positioned at the
beginning of the file.
``r+'' Open for reading and writing. The stream i...
d3 axis labeling
...ed Jun 28 '17 at 14:16
因特网的小熊因特网的小熊
3533 bronze badges
...
LINQ equivalent of foreach for IEnumerable
I'd like to do the equivalent of the following in LINQ, but I can't figure out how:
22 Answers
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Best way to serialize an NSData into a hexadeximal string
...:) You are right on the lengthy, I was just trying to hit everywhere I can win microseconds! It divide the loop iterations by 2. But I admit it lacks elegance. Bye
– Moose
Nov 15 '17 at 19:10
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How to run an EXE file in PowerShell with parameters with spaces and quotes
How do you run the following command in PowerShell?
19 Answers
19
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Redirect all to index.php using htaccess
...tant files or folders ) to index.php , you can use something like the following :
RewriteEngine on
RewriteRule ^((?!index\.php).+)$ /index.php [L]
Note the pattern ^((?!index\.php).+)$ matches any uri except index.php we have excluded the destination path to prevent infinite looping error.
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