C++ thread sleeping inconsistency

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Hey there guys.

Superb weird issue I got with c++... hope anyone can help me out understanding root cause...
The code:

for(int i = 0; i < 10; i++) {
    std::cout << i << " ";
    std::this_thread::sleep_for(std::chrono::milliseconds(1000));
}

Now - the thing is that if I run this in windows - the output comes as expected - every second a number is printed into console. And - when trying this on ubuntu machine it shows nothing and after 10 seconds prints all numbers instantly.

Any idea why it does not print the output every second as in windows?

What I have tried:

Tried building and running this in CodeLite with and without integrated terminal. Tried compiling and running using simple terminal manually (tried c++11 and c++14).

Posted 27-Jul-18 6:41am

MK-Gii

Updated 27-Jul-18 6:49am

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jeron1 · Accepted Answer · 2018-07-27T06:50:00

Solution 1

Try adding a std::flush to the cout line.

std::cout << i << " " << std::flush;

Posted 27-Jul-18 6:50am

jeron1

Comments

MK-Gii 27-Jul-18 12:56pm

Fantastic. Thank you:) That was fast, simple and graceful :)

jeron1 27-Jul-18 13:13pm

You're welcome. Doing a quick search for 'stdout buffering' will help you with details of why it was doing what it was doing.