preparing to build tox from sources

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diff --git a/libs/pthreads/src/pthread_attr_setdetachstate.c b/libs/pthreads/src/pthread_attr_setdetachstate.c
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+++ b/libs/pthreads/src/pthread_attr_setdetachstate.c
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+/*
+ * pthread_attr_setdetachstate.c
+ *
+ * Description:
+ * This translation unit implements operations on thread attribute objects.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      Pthreads-win32 - POSIX Threads Library for Win32
+ *      Copyright(C) 1998 John E. Bossom
+ *      Copyright(C) 1999,2005 Pthreads-win32 contributors
+ * 
+ *      Contact Email: rpj@callisto.canberra.edu.au
+ * 
+ *      The current list of contributors is contained
+ *      in the file CONTRIBUTORS included with the source
+ *      code distribution. The list can also be seen at the
+ *      following World Wide Web location:
+ *      http://sources.redhat.com/pthreads-win32/contributors.html
+ * 
+ *      This library is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU Lesser General Public
+ *      License as published by the Free Software Foundation; either
+ *      version 2 of the License, or (at your option) any later version.
+ * 
+ *      This library 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
+ *      Lesser General Public License for more details.
+ * 
+ *      You should have received a copy of the GNU Lesser General Public
+ *      License along with this library in the file COPYING.LIB;
+ *      if not, write to the Free Software Foundation, Inc.,
+ *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "pthread.h"
+#include "implement.h"
+
+
+int
+pthread_attr_setdetachstate (pthread_attr_t * attr, int detachstate)
+     /*
+      * ------------------------------------------------------
+      * DOCPUBLIC
+      *      This function specifies whether threads created with
+      *      'attr' will run detached.
+      *
+      * PARAMETERS
+      *      attr
+      *              pointer to an instance of pthread_attr_t
+      *
+      *      detachstate
+      *              an integer containing one of:
+      *
+      *              PTHREAD_CREATE_JOINABLE
+      *                              Thread ID is valid, must be joined
+      *
+      *              PTHREAD_CREATE_DETACHED
+      *                              Thread ID is invalid, cannot be joined,
+      *                              canceled, or modified
+      *
+      *
+      * DESCRIPTION
+      *      This function specifies whether threads created with
+      *      'attr' will run detached.
+      *
+      *      NOTES:
+      *              1)      You cannot join or cancel detached threads.
+      *
+      * RESULTS
+      *              0               successfully set detach state,
+      *              EINVAL          'attr' or 'detachstate' is invalid
+      *
+      * ------------------------------------------------------
+      */
+{
+  if (ptw32_is_attr (attr) != 0)
+    {
+      return EINVAL;
+    }
+
+  if (detachstate != PTHREAD_CREATE_JOINABLE &&
+      detachstate != PTHREAD_CREATE_DETACHED)
+    {
+      return EINVAL;
+    }
+
+  (*attr)->detachstate = detachstate;
+  return 0;
+}