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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...ere:
https://github.com/CarloWood/ai-statefultask-testsuite/blob/b69b112e2e91d35b56a39f41809d3e3de2f9e4b8/src/mutex_test.cxx
Note that it has a few hardcoded values specific for my box (xrange, yrange and rdtsc overhead), so you probably have to experiment with it before it will work for you.
The ...
Why would one use nested classes in C++?
...
John DiblingJohn Dibling
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...
Iterator invalidation rules
...dated, but iterators to elements remaining in a2 will remain valid. (Table 91 — Unordered associative container requirements)
Container Adaptors
stack: inherited from underlying container
queue: inherited from underlying container
priority_queue: inherited from underlying container
Erasure
Se...
Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ts an interface for a real-time data server.
/// </summary>
[Guid("EC0E6191-DB51-11D3-8F3E-00C04F3651B8")]
[TypeLibType(4160)]
public interface IRtdServer2
{
/// <summary>
/// Adds new topics from a real-time data server. The ConnectData method is called
/// when a file is op...
Is there a way to detect if an image is blurry?
...
FM = entropy(Image);
case 'HISR' % Histogram range (Firestone91)
FM = max(Image(:))-min(Image(:));
case 'LAPE' % Energy of laplacian (Subbarao92a)
LAP = fspecial('laplacian');
FM = imfilter(Image, LAP, 'replicate', 'conv');
FM = mean2(FM.^2);
...
How to automatically generate a stacktrace when my program crashes
...ets you this output:
$ ./test
Error: signal 11:
./test(handler+0x19)[0x400911]
/lib64/tls/libc.so.6[0x3a9b92e380]
./test(baz+0x14)[0x400962]
./test(bar+0xe)[0x400983]
./test(foo+0xe)[0x400993]
./test(main+0x28)[0x4009bd]
/lib64/tls/libc.so.6(__libc_start_main+0xdb)[0x3a9b91c4bb]
./test[0x40086a]
...
Git workflow and rebase vs merge questions
...CVonC
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内存管理内幕：动态分配的选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
...的版本非常类似的基本结构，但是它加入了索引，这使得搜索速度更快，并且可以将多个没有被使用的块组合为一个大的块。它还支持缓存，以便更快地再次使用最近释放的内存。 ptmalloc 是 Doug Lea Malloc 的一个扩展版本，支持多...
C dynamically growing array
...
@Balkania: 7 * 3264 * 32 bit sounds like 91.39 kilobytes. Not that much by any standard these days ;)
– Wolph
Aug 21 '10 at 3:57
1
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How to calculate moving average using NumPy?
...± std. dev. of 7 runs, 100 loops each)
Numpy array rolling :
31.3 ms ± 91.9 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
Numpy array rolling, edge handling :
61.1 ms ± 55.9 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
Timing, Large window (n=1001)
Direct "for" loo...