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# Spawn
Limbo supports the creation of processes operating on a given function via the `spawn` statement. Functions passed to spawn cannot have a return value.
Inferno processes share memory with their parent processes which spawn them, bar the process's respective stack. Inferno processes are pre-emptively scheduled by the Inferno kernel. These processes are analogous, but not equivocal to, threads in unix-like systems.
Synchronization between processes is recommended to be done through [channels](../Channels).
For further reading on potential inspirations for Inferno processes, see [rfork(2)](http://man.cat-v.org/9front/2/fork).
## Source
### spawn.b:31,40
This section spawns four processes all of which will attempt to print to their standard output. Two functions spawn running the `quacker()` function and two function spawn running the `summer()` function with varying arguments.
Note: The call to `sleep()` in this context within the `init()` function.
## Demo
; limbo spawn.b
; spawn
quack!
Sum (2): 0
quack!
Sum (3): 0
Sum (2): 1
Sum (3): 1
Sum (2): 3
Sum (3): 3
Final sum (2): 3
Sum (3): 6
Final sum (3): 6
;
## Exercises
- How many different orders do you see the print statements occur in?
- What happens if you remove the sleep?
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