TVar package:unliftio

data () => TVar a

Shared memory locations that support atomic memory transactions.

Lifted version of mkWeakTVar

Mutate the contents of a TVar. N.B., this version is non-strict.

Strict version of modifyTVar.

Create a new TVar holding a value supplied

Lifted version of newTVarIO

Return the current value stored in a TVar.

Lifted version of readTVarIO

Like modifyTVar' but the function is a simple state transition that can return a side value which is passed on as the result of the STM.

Swap the contents of a TVar for a new value.

Write the supplied value into a TVar.