Why does DoEvents use 100% cpu? And whats an alternative?

[VaxoP]

Do
Doevents
Loop until condition = true

thats the code thats generally used to have the app perform a task 'synchronously' so that further code is not executed until something else is done.

But the problem is, the loop causes 100% cpu usage until the condition is true, slowing all other open processes needlessly.

An alternative is adding the sleep function to the loop

Do
Doevents
Sleep 100
Loop until condition = true

but Sleep causes all executions to halt in the app

so..
Doevents: Lets the app execute the background function, but uses 100% cpu
Sleep: Does not let the app execute the background function, uses 0% CPU
Combination: App can execute things in the background while sleep is not being called, ~0% CPU, but not good enough.

There HAS to be a better way to wait until something is done (background) before going on to the next line, without using doevents or sleep..

Anyone know what that is?

the best way i can think of doing this is a timer.. but its not elegant at all

'below is an alternative to RunSomeFunctionInTheBackground(): Do: Doevents: Loop until condition = true: Continue with other stuff
 
Private Sub Form_Load()
mySub 0
End Sub
 
Private Sub mySub(whereToStart As Integer)
Select Case whereToStart
Case 0
    RunSomeFunctionInTheBackground()
    Timer1.Enabled = True
    Exit Sub
Case 1
    'The function is done running, I can continue with my app
End Select
End Sub
 
Private Sub Timer1_Timer()
If someCondition = True Then
    Timer1.Enabled = False
    mySub 1
End If
End Sub
 
'this method will function like DoEvents, and it will not halt execution of the thread like Sleep.  Timer interval is something like 10

Basically I just want to be able to use

RunSomeFunctionInTheBackground()
waitUntilThatFunctionisDone() '(but not use 100% cpu like doevents, or halt the execution of that function with sleep)
continue with app