gnu: Add libcuckoo.

* gnu/packages/datastructures.scm (libcuckoo): New variable.

gnu/packages/datastructures.scm

@@ -4,7 +4,7 @@
 ;;; Copyright © 2018 Meiyo Peng <meiyo.peng@gmail.com>
 ;;; Copyright © 2019, 2020, 2022 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2020 Mark H Weaver <mhw@netris.org>
-;;; Copyright © 2020 Marius Bakke <marius@gnu.org>
+;;; Copyright © 2020, 2022 Marius Bakke <marius@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -28,6 +28,7 @@
   #:use-module (gnu packages perl)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix packages)
+  #:use-module (guix gexp)
   #:use-module (guix download)
   #:use-module (guix git-download)
   #:use-module (guix build-system cmake)
@@ -134,6 +135,29 @@ that have sequences of identical bytes in the same order, even though bytes
 in between these sequences may be different in both content and length.")
     (license license:gpl2+)))
 
+(define-public libcuckoo
+  (package
+    (name "libcuckoo")
+    (version "0.3.1")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/efficient/libcuckoo")
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0h9yhpkhk813dk66y6bs2csybw3pbpfnp3cakr2xism02vjwy19l"))))
+    (build-system cmake-build-system)
+    (arguments
+     (list #:configure-flags #~'("-DBUILD_TESTS=1")))
+    (home-page "https://efficient.github.io/libcuckoo/")
+    (synopsis "Concurrent hash table")
+    (description
+     "@code{libcuckoo} provides a high-performance, compact hash table that
+allows multiple concurrent reader and writer threads.")
+    (license license:asl2.0)))
+
 (define-public liburcu
   (package
     (name "liburcu")