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C++ SpinLock 自旋锁的代码实现（全网最简略的方式） - C/C++ - 清泛网 - ...
...r>
#include <unistd.h>
using namespace std;
class SpinLock {
atomic_flag f_;
public:
SpinLock():f_(ATOMIC_FLAG_INIT) {}
virtual ~SpinLock() {}
void lock() { while(f_.test_and_set(memory_order_acquire)); }
void unlock() { f_.clear(memory_order_release); }
};
2、有退避策略的...
Import multiple csv files into pandas and concatenate into one DataFrame
I would like to read several csv files from a directory into pandas and concatenate them into one big DataFrame. I have not been able to figure it out though. Here is what I have so far:
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What does ** (double star/asterisk) and * (star/asterisk) do for parameters?
In the following method definitions, what does the * and ** do for param2 ?
22 Answers
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best way to preserve numpy arrays on disk
I am looking for a fast way to preserve large numpy arrays. I want to save them to the disk in a binary format, then read them back into memory relatively fastly. cPickle is not fast enough, unfortunately.
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How to get process ID of background process?
I start a background process from my shell script, and I would like to kill this process when my script finishes.
7 Answers...
Get path from open file in Python
If I have an opened file, is there an os call to get the complete path as a string?
4 Answers
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PHP Array to CSV
I'm trying to convert an array of products into a CSV file, but it doesn't seem to be going to plan. The CSV file is one long line, here is my code:
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What is a lambda expression in C++11?
What is a lambda expression in C++11? When would I use one? What class of problem do they solve that wasn't possible prior to their introduction?
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Add a CSS class to
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<%= f.submit 'name of button here', :class => 'submit_class_name_here' %>
This should do. If you're getting an error, chances are that you're not supplying the name.
Alternatively, you can style the button without a clas...
Reading a binary file with python
I find particularly difficult reading binary file with Python. Can you give me a hand?
I need to read this file, which in Fortran 90 is easily read by
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