[bug#56202] [PATCH v3] gnu: Add nsync.

[Antero Mejr]

* gnu/packages/c.scm (nsync): New variable.
---
 gnu/packages/c.scm | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/gnu/packages/c.scm b/gnu/packages/c.scm
index b2f16613dd..c7d3fb258c 100644
--- a/gnu/packages/c.scm
+++ b/gnu/packages/c.scm
@@ -1375,3 +1375,32 @@ (define-public utest-h
       (description
        "This package provides a header-only unit testing library for C/C++.")
       (license license:unlicense))))
+
+(define-public nsync
+  (package
+    (name "nsync")
+    (version "1.25.0")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/google/nsync";)
+                    (commit version)))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "1nnavsm5m0yl65r9nyxzzg0y1z1dr0r9933b5329k7n1r6ndinbd"))))
+    (build-system cmake-build-system)
+    (arguments
+     (list #:configure-flags #~(list "-DBUILD_SHARED_LIBS=ON")))
+    (home-page "https://github.com/google/nsync";)
+    (synopsis "C library for synchronization primitives")
+    (description
+     "nsync is a C library that exports various synchronization primitives:
+@itemize
+@item locks
+@item condition variables
+@item run-once initialization
+@item waitable counter (useful for barriers)
+@item waitable bit (useful for cancellation, or other conditions)
+@end itemize")
+    (license license:asl2.0)))
-- 
2.38.1