Control.Concurrent.Classy.STM.TMVar

A TMVar is like an MVar or a mVar, but using transactional memory. As transactions are atomic, this makes dealing with multiple TMVars easier than wrangling multiple mVars.

Create a TMVar containing the given value.

Create a TMVar containing the given value, with the given name.

Name conflicts are handled as usual for TVars. The name is prefixed with "ctmvar-".

Create a new empty TMVar.

Create a new empty TMVar with the given name.

Name conflicts are handled as usual for TVars. The name is prefixed with "ctmvar-".

Take the contents of a TMVar, or retry if it is empty.

Write to a TMVar, or retry if it is full.

Read from a TMVar without emptying, or retry if it is empty.

Try to take the contents of a TMVar, returning Nothing if it is empty.

Try to write to a TMVar, returning False if it is full.

Try to read from a TMVar without emptying, returning Nothing if it is empty.

Check if a TMVar is empty or not.

Swap the contents of a TMVar returning the old contents, or retry if it is empty.