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开源邮件传输代理软件 -- Postfix 介绍 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...兼容性。1. postfix是免费的：
postfix想要作用的范围是广大的Internet用户，试图影响大多数的Internet上的电子邮件系统，因此它是免费的。
2. 更快：
postfix在性能上大约比sendmail快三倍。一部运行postfix的台式PC每天可以收发上...
Why is the console window closing immediately once displayed my output?
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I'm a little bit late to the party, but: in Visual Studio 2019 for .NET Core projects the console doesn't close automatically by default. You can configure the behaviour through menu Tools → Options → Debugging → General → Automatically close the console when debugging stops. If you get y...
select、poll、epoll之间的区别总结[整理] - C/C++ - 清泛网 - 专注C/C++及内核技术
...把fd_set从内核空间拷贝到用户空间。
总结：
select的几大缺点：
（1）每次调用select，都需要把fd集合从用户态拷贝到内核态，这个开销在fd很多时会很大
（2）同时每次调用select都需要在内核遍历传递进来的所有fd，这个开销...
开源MQTT网关：EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区，为创新赋能！
...键业务场景。EMQX 采用 Erlang/OTP 编写，这是一种用于构建大规模可扩展软实时系统的编程语言。与 Mosquitto 不同，EMQX 在设计之初即采用了分布式集群架构，可以轻松实现弹性水平扩展，从而稳定承载大规模的 MQTT 客户端接入。最...
Passing variable arguments to another function that accepts a variable argument list
... to happen. This allows printf, sprintf, and fprintf to all use the same 'core' mechanism. For example, vsprintf might be something like:
void s_out(PRINTF_INFO *p_inf, char ch)
{
(*(p_inf->destptr)++) = ch;
p_inf->result++;
}
int vsprintf(char *dest, const char *fmt, va_list args)
{
...
Test whether a list contains a specific value in Clojure
... this case... it slightly surprises me that there isn't one already in the core language.
– mikera
Jul 14 '10 at 19:06
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BSS段、数据段、代码段、堆与栈 剖析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...指用来存放程序执行代码的一块内存区域。这部分区域的大小在程序运行前就已经确定，并且内存区域通常属于只读, 某些架构也允许代码段为可写，即允许修改程序。在代码段中，也有可能包含一些只读的常数变量，例如字符...
How to run a single RSpec test?
...de
end
RSpec documentation:
https://www.rubydoc.info/github/rspec/rspec-core/RSpec/Core/Configuration#filter_run_when_matching-instance_method
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Which version of Perl should I use on Windows? [closed]
...s that my modules sometimes fail to install because I need an upgrade to a core module, but they won't allow that. Thus, everybody who doesn't use Windows can use my code, but they can't do that with ActiveState's Perl.
ActiveState also has a very dodgy build system which often fails to report exa...
How to remove a single, specific object from a ConcurrentBag?
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FYI, SynchronizedCollection is not available in .NET Core. As of the date of this comment, the System.Collections.Concurrent types are the way current way to go for .NET Core based implementations.
– Matthew Snyder
Jun 13 '19 at 14:58
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