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# Message passing & capacity
Software tasks support message passing, this means that software tasks can be spawned
with an argument: `foo::spawn(1)` which will run the task `foo` with the argument `1`.
Capacity sets the size of the spawn queue for the task. If it is not specified, the capacity defaults to 1.
In the example below, the capacity of task `foo` is `3`, allowing three simultaneous
pending spawns of `foo`. Exceeding this capacity is an `Error`.
The number of arguments to a task is not limited:
``` rust,noplayground
{{#include ../../../../examples/message_passing.rs}}
```
``` console
$ cargo xtask qemu --verbose --example message_passing
{{#include ../../../../ci/expected/message_passing.run}}
```
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