distro: Add GNU Pth.

* distro/packages/pth.scm: New file.
* Makefile.am (MODULES): Add it.

Makefile.am

@@ -60,6 +60,7 @@ MODULES =					\
   distro/packages/ncurses.scm			\
   distro/packages/perl.scm			\
   distro/packages/pkg-config.scm		\
+  distro/packages/pth.scm			\
   distro/packages/readline.scm			\
   distro/packages/recutils.scm
 

distro/packages/pth.scm

@@ -0,0 +1,60 @@
+;;; Guix --- Nix package management from Guile.         -*- coding: utf-8 -*-
+;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of Guix.
+;;;
+;;; Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (distro packages pth)
+  #:use-module (guix packages)
+  #:use-module (guix ftp)
+  #:use-module (guix build-system gnu))
+
+(define-public pth
+  (package
+    (name "pth")
+    (version "2.0.7")
+    (source
+     (origin
+      (method ftp-fetch)
+      (uri (string-append "ftp://ftp.gnu.org/gnu/pth/pth-" version
+                          ".tar.gz"))
+      (sha256
+       (base32
+        "0ckjqw5kz5m30srqi87idj7xhpw6bpki43mj07bazjm2qmh3cdbj"))))
+    (build-system gnu-build-system)
+    (arguments '(#:parallel-build? #f))
+    (home-page "http://www.gnu.org/software/pth")
+    (synopsis "The GNU Portable Threads library")
+    (description
+     "Pth is a very portable POSIX/ANSI-C based library for Unix
+platforms which provides non-preemptive priority-based scheduling for
+multiple threads of execution (aka ``multithreading'') inside
+event-driven applications. All threads run in the same address space of
+the server application, but each thread has it's own individual
+program-counter, run-time stack, signal mask and errno variable.
+
+The thread scheduling itself is done in a cooperative way, i.e., the
+threads are managed by a priority- and event-based non-preemptive
+scheduler. The intention is that this way one can achieve better
+portability and run-time performance than with preemptive
+scheduling. The event facility allows threads to wait until various
+types of events occur, including pending I/O on file descriptors,
+asynchronous signals, elapsed timers, pending I/O on message ports,
+thread and process termination, and even customized callback functions.
+
+Additionally Pth provides an optional emulation API for POSIX.1c
+threads (\"Pthreads\") which can be used for backward compatibility to
+existing multithreaded applications.")
+    (license #f)))