28/28: gnu: Add ghc-concurrent-extra.

[guix-commits]

rob pushed a commit to branch wip-haskell-updates
in repository guix.

commit 8719e8fa31f06ea9e745353112a8aa81e0840d9b
Author: Robert Vollmert <address@hidden>
Date:   Mon Jul 15 10:50:58 2019 +0200

    gnu: Add ghc-concurrent-extra.
    
    * gnu/packages/haskell-xyz.scm (ghc-concurrent-extra): New package.
---
 gnu/packages/haskell-xyz.scm | 46 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/gnu/packages/haskell-xyz.scm b/gnu/packages/haskell-xyz.scm
index f8a063a..37ff8c1 100644
--- a/gnu/packages/haskell-xyz.scm
+++ b/gnu/packages/haskell-xyz.scm
@@ -259,3 +259,49 @@ The advantages of this package are:
 * Correct handling of asynchronous exceptions.
 * GHC specific functionality like forkOn and forkIOWithUnmask.")
     (license license:bsd-3)))
+
+(define-public ghc-concurrent-extra
+  (package
+    (name "ghc-concurrent-extra")
+    (version "0.7.0.12")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             
"https://hackage.haskell.org/package/concurrent-extra/concurrent-extra-";
+             version
+             ".tar.gz"))
+       (sha256
+        (base32
+         "1y8xk460fvnw0idzdiylmm874sjny4q9jxb1js9fjz8lw2wns3h4"))))
+    (build-system haskell-build-system)
+    (inputs
+     `(("ghc-unbounded-delays" ,ghc-unbounded-delays)))
+    (native-inputs
+     `(("ghc-hunit" ,ghc-hunit)
+       ("ghc-random" ,ghc-random)
+       ("ghc-test-framework" ,ghc-test-framework)
+       ("ghc-test-framework-hunit"
+        ,ghc-test-framework-hunit)
+       ("ghc-async" ,ghc-async)))
+    (home-page
+     "https://github.com/basvandijk/concurrent-extra";)
+    (synopsis "Extra concurrency primitives")
+    (description
+     "The concurrent-extra package offers among other things the following
+selection of synchronisation primitives:
+* Broadcast: Wake multiple threads by broadcasting a value.
+* Event: Wake multiple threads by signalling an event.
+* Lock: Enforce exclusive access to a resource.  Also known as a binary
+semaphore or mutex.  The package additionally provides an alternative that
+works in the STM monad.
+* RLock: A lock which can be acquired multiple times by the same thread.
+Also known as a reentrant mutex.
+* ReadWriteLock: Multiple-reader, single-writer locks.  Used to protect
+shared resources which may be concurrently read, but only sequentially
+written.
+* ReadWriteVar: Concurrent read, sequential write variables.
+Please consult the API documentation of the individual modules for more
+detailed information.
+This package was inspired by the concurrency libraries of Java and Python.")
+    (license license:bsd-3)))