| Copyright | (c) Sergey Vinokurov 2022 |
|---|---|
| License | Apache-2.0 (see LICENSE) |
| Maintainer | serg.foo@gmail.com |
| Safe Haskell | None |
| Language | Haskell2010 |
Control.Concurrent.Counter.Lifted.IO
Description
Lifted Counter specialized to
operate in the IO monad.
Synopsis
- data Counter
- new :: Int -> IO Counter
- get :: Counter -> IO Int
- set :: Counter -> Int -> IO ()
- cas :: Counter -> Int -> Int -> IO Int
- add :: Counter -> Int -> IO Int
- sub :: Counter -> Int -> IO Int
- and :: Counter -> Int -> IO Int
- or :: Counter -> Int -> IO Int
- xor :: Counter -> Int -> IO Int
- nand :: Counter -> Int -> IO Int
Documentation
Memory location that supports select few atomic operations.
Isomorphic to IORef Int.
Create
Read/write
Arguments
| :: Counter | |
| -> Int | Expected old value |
| -> Int | New value |
| -> IO Int |
Atomic compare and swap, i.e. write the new value if the current value matches the provided old value. Returns the value of the element before the operation
Arithmetic operations
add :: Counter -> Int -> IO Int Source #
Atomically add an amount to the counter and return its old value.
sub :: Counter -> Int -> IO Int Source #
Atomically subtract an amount from the counter and return its old value.
Bitwise operations
and :: Counter -> Int -> IO Int Source #
Atomically combine old value with a new one via bitwise and. Returns old counter value.
or :: Counter -> Int -> IO Int Source #
Atomically combine old value with a new one via bitwise or. Returns old counter value.