boost :: asio :: steady_timer()vs sleep()我应该使用哪一个? [英] boost::asio::steady_timer() vs sleep() which one should I use?

问题描述

从运行时间的角度来看，以下两个程序相同，均等待5秒钟才能继续.一个使用boost :: asio :: steady_timer，另一个使用sleep()，哪个更好?

The following two program are same from run time point of view, both waiting for 5 seconds to continue. One uses boost::asio::steady_timer, another uses sleep(), which one is better?

1)使用sleep()

1) Use sleep()

$ cat b.cpp
#include <iostream>
#include <unistd.h>

int main(void)
{
    std::cout << "start" << std::endl;
    sleep(5);
    std::cout << "end" << std::endl;
}

$ g++ b.cpp && ./a.out
start
end

2)使用boost :: asio :: steady_timer

2) Use boost::asio::steady_timer

$ cat c.cpp
#include <iostream>
#include <boost/asio.hpp>

int main(void)
{
    std::cout << "start" << std::endl;
    boost::asio::io_context io;
    boost::asio::steady_timer t(io, boost::asio::chrono::seconds(5));
    t.wait();
    std::cout << "end" << std::endl;
    return 0;
}

$ g++ c.cpp -lpthread -lboost_system && ./a.out
start
end

推荐答案

1)

sleep(5)

• meh:依赖于unistd.h标头，它是非标准且特定于posix的，可能会或可能不会出现问题，但需要考虑
• con:仅需整数，因此您无法选择亚秒级睡眠，并且可能不清楚这表示5秒，而不是其他单位.
• meh: relies on the unistd.h header, which is nonstandard and posix-specific, which may or may not be a problem, but is something to consider
• con: only takes integer so you don't have the option to sleep for sub-seconds, and can be unclear that it means 5 seconds and not some other unit.

2)

boost::asio::io_context io;
boost::asio::steady_timer t(io, boost::asio::chrono::seconds(5));
t.wait();

• meh:依赖于boost，如果您已经包含另一个boost库，这不是问题，但仅出于此目的会显得过分
• con:取决于io_context
• pro:使用boost::asio::chrono定义睡眠时间，可以使您更细腻，更清晰
• meh: relies on boost, not a problem if you're already including another boost library, but would be overkill just for this purpose
• con: depends on an io_context
• pro: uses boost::asio::chrono for defining the time to sleep which can give you more granularity and more clarity

3)

std::this_thread::sleep_for(std::chrono::seconds(5));

• pro:标准库函数(C ++ 11及更高版本)
• pro:使用std::chrono定义睡眠时间，可以使您更细腻，更清晰
• pro: standard library function (C++11 and up)
• pro: uses std::chrono for defining the time to sleep which can give you more granularity and more clarity

注意:如果您是C ++ 11之前的版本，boost也有 this_thread::sleep_for

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