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# Mutexed Data
To serve the general case of synchronizing access to shared datastructures,
Tomo uses the `mutexed` keyword, which returns a function which can be used
to ensure that all access to a datastructure is guarded by a mutex:
```tomo
with_nums := mutexed [10, 20, 30]
thread := Thread.new(func():
with_nums(func(nums:&[Int]):
nums:insert(30)
)
)
with_nums(func(nums:&[Int]):
nums:insert(40)
)
thread:join()
```
Without having a mutex guard, the code above could run into concurrency issues
leading to data corruption.
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