blob: 0e2bb98b0c6bd7f04ae51d59f23159f68fde0663 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
{- git-annex assistant transfer slots
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Assistant.TransferSlots where
import Control.Exception
import Control.Concurrent
type TransferSlots = QSemN
{- Number of concurrent transfers allowed to be run from the assistant.
-
- Transfers launched by other means, including by remote assistants,
- do not currently take up slots.
-}
numSlots :: Int
numSlots = 1
newTransferSlots :: IO TransferSlots
newTransferSlots = newQSemN numSlots
{- Waits until a transfer slot becomes available, and runs a transfer
- action in the slot.
-}
inTransferSlot :: TransferSlots -> IO a -> IO a
inTransferSlot s = bracket_ (waitQSemN s 1) (signalQSemN s 1)
|