while(true)

[Selim Ozel]

On Saturday, 25 September 2021 at 09:46:09 UTC, jfondren wrote:
> On Saturday, 25 September 2021 at 09:35:16 UTC, Selim Ozel 
> wrote:
>> Let's say that I have a simple D program as follows:
>> ```
>> void main() {
>>   while(true) {
>>   }
>>   assert(false);
>> }
>> ```
>>
>> It will run until killed. It also uses a lot of CPU. Is there 
>> a good DLang way to make it use less CPU?
>>
>> Selim
>
> ```d
> void main() {
>     import core.sys.posix.unistd : pause;
>
>     while (true) {
>         pause;
>     }
>     assert(false);
> }
> ```
>
> man 2 pause, it sleeps the calling thread until a signal is 
> received.

Thanks for the answer. I have actually just re-remembered the 
thread library in D. Following worked for me.

```d
import core.thread;
import core.time: dur;
import std.stdio;

void threadFunc(){
   writeln("Thread entered");
   while(true){
     Thread.sleep( dur!("seconds")( 5 ) );
     writeln("Once per 5 seconds.");
   }
}

void main() {
   auto composed = new Thread(&threadFunc).start();
}

```