From 393b24fe894312605801141718b3e6f5195cf1bd Mon Sep 17 00:00:00 2001
From: Neil Cook <neil.cook@noware.co.uk>
Date: Wed, 26 Oct 2016 14:32:35 +0000
Subject: [PATCH 1/2] pthread-based locking for arc4random

---
 configure.ac           |  2 +-
 src/compat/arc4_lock.c | 19 ++++++++++++++++++-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index b2c066a2..90a27d04 100644
--- a/configure.ac
+++ b/configure.ac
@@ -644,7 +644,7 @@ CHECK_CFLAGS=""
 PKG_CHECK_MODULES([CHECK],[check >= 0.9.6],[CHECK_GETDNS="check_getdns"],[
 AC_SEARCH_LIBS([floor], [m])
 AC_SEARCH_LIBS([timer_create], [rt])
-AC_SEARCH_LIBS([pthread_create], [pthread])
+AC_SEARCH_LIBS([pthread_create], [pthread], [AC_DEFINE([HAVE_PTHREADS], [1], [Define if pthreads exist.])])
 AC_SEARCH_LIBS([srunner_create],[check check_pic],[
 CHECK_GETDNS="check_getdns"
 CHECK_LIBS="$LIBS"],[
diff --git a/src/compat/arc4_lock.c b/src/compat/arc4_lock.c
index 44662841..facf9575 100644
--- a/src/compat/arc4_lock.c
+++ b/src/compat/arc4_lock.c
@@ -34,6 +34,23 @@
 #include "config.h"
 #define LOCKRET(func) func
 
+#ifdef HAVE_PTHREADS
+#include "pthread.h"
+
+static pthread_mutex_t arc_lock = PTHREAD_MUTEX_INITIALIZER;
+
+void _ARC4_LOCK(void)
+{
+    pthread_mutex_lock(&arc_lock);
+}
+
+void _ARC4_UNLOCK(void)
+{
+    pthread_mutex_unlock(&arc_lock);
+}
+
+#else
+/* XXX - add windows-(or at least non pthread) specific lock routines here */
 void _ARC4_LOCK(void)
 {
 }
@@ -41,4 +58,4 @@ void _ARC4_LOCK(void)
 void _ARC4_UNLOCK(void)
 {
 }
-
+#endif

From db6cee94fa537bff05f6a01a92b3cbb322adc4dc Mon Sep 17 00:00:00 2001
From: Neil Cook <neil.cook@noware.co.uk>
Date: Wed, 26 Oct 2016 15:47:44 +0000
Subject: [PATCH 2/2] Fix HAVE_PTHREADS define in configure.ac

---
 configure.ac | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 90a27d04..e8a1650b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -644,7 +644,7 @@ CHECK_CFLAGS=""
 PKG_CHECK_MODULES([CHECK],[check >= 0.9.6],[CHECK_GETDNS="check_getdns"],[
 AC_SEARCH_LIBS([floor], [m])
 AC_SEARCH_LIBS([timer_create], [rt])
-AC_SEARCH_LIBS([pthread_create], [pthread], [AC_DEFINE([HAVE_PTHREADS], [1], [Define if pthreads exist.])])
+AC_SEARCH_LIBS([pthread_create], [pthread])
 AC_SEARCH_LIBS([srunner_create],[check check_pic],[
 CHECK_GETDNS="check_getdns"
 CHECK_LIBS="$LIBS"],[
@@ -924,6 +924,10 @@ if [ test -n "$DOXYGEN" ]
 fi
 
 
+#---- check for pthreads library
+AC_SEARCH_LIBS([pthread_mutex_init],[pthread],[AC_DEFINE([HAVE_PTHREADS], [1], [Have pthreads library])], [AC_MSG_WARN([pthreads not available])])
+
+
 dnl -----
 dnl ----- Start of "Things needed for gldns" section
 dnl -----