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Is errno thread-safe?
In errno.h , this variable is declared as extern int errno; so my question is, is it safe to check errno value after some calls or use perror() in multi-threaded code. Is this a thread safe variable? If not, then whats the alternative ?
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Saving utf-8 texts in json.dumps as UTF8, not as \u escape sequence
...ealize it was that simple. You only need to be careful if the data you are converting to json is untrusted user input.
– Karim Sonbol
Jun 29 '18 at 9:48
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Print new output on same line [duplicate]
I want to print the looped output to the screen on the same line.
7 Answers
7
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What is Autoloading; How do you use spl_autoload, __autoload and spl_autoload_register?
...lternate universes, please add that spl_autoload very, um, "helpfully" (?) converts all filenames to lowercase (see my comment to @user below). Can't use spl_autoload_register() vanilla if you like your CapitalLettersAndStuff.
– Just Plain High
Nov 28 '13 at 4:...
PreparedStatement IN clause alternatives?
...eter count is known, run:
sql = any( sql, count );
For example:
/**
* Converts a SQL statement containing exactly one IN clause to an IN clause
* using multiple comma-delimited parameters.
*
* @param sql The SQL statement string with one IN clause.
* @param params The number of parameters t...
Stopping python using ctrl+c
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What if there isn't? I'm on a Intel Macbook, and it doesn't have a very full-featured keyboard.
– Bluu
Sep 24 '10 at 22:03
53
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Why is reading lines from stdin much slower in C++ than Python?
...rs, this could lead to a problem if both were used together. For example:
int myvalue1;
cin >> myvalue1;
int myvalue2;
scanf("%d",&myvalue2);
If more input was read by cin than it actually needed, then the second integer value wouldn't be available for the scanf function, which has its o...
How do I plot in real-time in a while loop using matplotlib?
.../motivation that would be great. (seems like this new blit operation would convert Matplotlib from only use for offline or very slowly changing data to now you can use Matplotlib with very fast updating data... almost like an oscilloscope).
– Trevor Boyd Smith
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Having options in argparse with a dash
...nd stripping away the initial -- string. Any internal - characters will be converted to _ characters to make sure the string is a valid attribute name
So you should be using args.pm_export.
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可重入函数、不可重入函数及线程安全 - C/C++ - 清泛网 - 专注C/C++及内核技术
...clude <stdlib.h>
#include <stdio.h>
#include <pwd.h>
static void func(int signo)
{
struct passwd *rootptr;
if( ( rootptr = getpwnam( "root" ) ) == NULL )
{
err_sys( "getpwnam error" );
}
signal(SIGALRM,func);
alarm(1);
}
int main(int argc, char** argv...