runBlocking{
println("init")                                  
 launch{
delay(200)                                        
println("launch one")
}                                                 
println("mid")
    launch{                                           
     delay(100)
     println("launch two")                          
   }
   println("end")                                  
 }
init
mid
end                                                  
launch two
launch one


suspend fun cli(arg:String)=Runtime.getRuntime() .exec(arg).getInputStream().bufferedReader().readLines().forEach(::println)


runBlocking{
   println("init")
   launch{
   cli("du -hs")
   println("launch one")
   }

   println("mid")

   launch{
   cli("ls")
   println("launch two")
   }
   println("end")
 }

//optput
init
mid
end
11G     .
launch one 
AR 
UB
storage
launch two

In this code why in second runBlocking i am not getting output like mentioned below where du -hs takes more time compare to ls command. In first runBlocking launch one has 200 delay so first second launch runs but in second runBlocking it doesn't why? Sorry for noob question or queries but I am new to coroutines and trying to learn. init mid end AR UB storage launch two 11G launch one

Your

cli()

calls are blocking calls, marking the function

suspend

does not make it automatically non-blocking. Running the process and reading the input stream is blocking the only thread you're using (the one held by

runBlocking

). You can work around this by wrapping the body of

cli()

in

withContext(<http://Dispatchers.IO|Dispatchers.IO>) { ... }

so it's dispatched on another thread and blocks that thread instead of the one of runBlocking

Thanks this was really helpful 😇