non-block reading from pipe stdout

[Oleg B]

On Tuesday, 3 October 2017 at 12:32:43 UTC, kdevel wrote:
> IMHO a program should sleep (consume 0 CPU time and 0 energy) 
> if there is nothing to process. This is best accomplished by 
> not polling on a file descriptor in order to check if data has 
> arrived. If your program must yield() there's probably 
> something wrong with the design. I would suggest you put all 
> the filedescriptors into a fd_set an then select(3) on the set.

Programs based on fibers can't sleep while wait data and it's not 
a design problem.