Cthread changes for the Hurd.

---
Copyright 2001, Igor Khavkine, All rights reserved.
This is free software; you can redistribute and use it
under the same terms as OpenLDAP itself.

configure.in

@@ -1549,7 +1549,7 @@ if test $ol_with_threads = auto -o $ol_with_threads = yes \
 	-o $ol_with_threads = mach ; then
 
 	dnl check for Mach CThreads
-	AC_CHECK_HEADERS(mach/cthreads.h)
+	AC_CHECK_HEADERS(mach/cthreads.h cthread.h)
 	if test $ac_cv_header_mach_cthreads_h = yes ; then
 		ol_with_threads=found
 
@@ -1577,17 +1577,34 @@ if test $ol_with_threads = auto -o $ol_with_threads = yes \
 			fi
 		fi
 
-		if test $ol_link_threads != no ; then
+    elif test $ac_cv_header_cthreads_h = yes ; then
-			: check for cthread specific functionality here
+		dnl Hurd variant of Mach Cthreads
-			AC_DEFINE(HAVE_MACH_CTHREADS,1,
+		dnl uses <cthreads.h> and -lthreads
-				[define if you have Mach Cthreads])
+
+		ol_with_threads=found
+ 
+		dnl save the flags
+		save_LIBS="$LIBS"
+		LIBS="$LIBS -lthreads"
+		AC_CHECK_FUNC(cthread_fork,[ol_link_threads=yes])
+		LIBS="$save_LIBS"
+
+		if test $ol_link_threads = yes ; then
+			LTHREAD_LIBS="-lthreads"
+			ol_link_threads=mach
 		else
 			AC_MSG_ERROR([could not link with Mach CThreads])
 		fi
+
+	elif test $ol_with_threads = mach ; then
+		AC_MSG_ERROR([could not locate Mach CThreads])
 	fi
 
-	if test $ol_with_threads = mach ; then
+	if test $ol_link_threads = mach ; then
-		AC_MSG_ERROR([could not locate Mach CThreads])
+		AC_DEFINE(HAVE_MACH_CTHREADS,1,
+			[define if you have Mach Cthreads])
+	elif test $ol_with_threads = found ; then
+		AC_MSG_ERROR([could not link with Mach CThreads])
 	fi
 fi
 

include/ldap_int_thread.h

@@ -62,7 +62,11 @@ LDAP_END_DECL
  *                                *
  **********************************/
 
+#if defined( HAVE_MACH_CTHREADS_H )
 #	include <mach/cthreads.h>
+#elif defined( HAVE_CTHREAD_H
+#	include <cthreads.h>
+#endif
 
 LDAP_BEGIN_DECL
 

include/portable.h.in

@@ -343,6 +343,9 @@
 /* Define if you have the <crypt.h> header file.  */
 #undef HAVE_CRYPT_H
 
+/* Define if you have the <cthread.h> header file.  */
+#undef HAVE_CTHREAD_H
+
 /* Define if you have the <db.h> header file.  */
 #undef HAVE_DB_H