From b548cce9d872ba9fa9819f1f2d5c956409535145 Mon Sep 17 00:00:00 2001
From: Neel Goyal <ngoyal@verisign.com>
Date: Fri, 28 Feb 2014 19:24:09 -0500
Subject: [PATCH] Add a method to change unbound async mode (getdns_extra)
 between fork and thread

---
 src/context.c             | 15 +++++++++++++++
 src/getdns/getdns_extra.h |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/src/context.c b/src/context.c
index 92e355bd..d6f0f1fb 100644
--- a/src/context.c
+++ b/src/context.c
@@ -1791,4 +1791,19 @@ getdns_context_set_return_dnssec_status(getdns_context* context, int enabled) {
     return GETDNS_RETURN_GOOD;
 }
 
+getdns_return_t
+getdns_context_set_use_threads(getdns_context* context, int use_threads) {
+    RETURN_IF_NULL(context, GETDNS_RETURN_INVALID_PARAMETER);
+    if (context->resolution_type_set != 0) {
+        /* already setup */
+        return GETDNS_RETURN_CONTEXT_UPDATE_FAIL;
+    }
+    int r = 0;
+    if (use_threads)
+        r = ub_ctx_async(context->unbound_ctx, 1);
+    else
+        r = ub_ctx_async(context->unbound_ctx, 0);
+    return r == 0 ? GETDNS_RETURN_GOOD : GETDNS_RETURN_CONTEXT_UPDATE_FAIL;
+}
+
 /* context.c */
diff --git a/src/getdns/getdns_extra.h b/src/getdns/getdns_extra.h
index eeba17dd..c17996e2 100644
--- a/src/getdns/getdns_extra.h
+++ b/src/getdns/getdns_extra.h
@@ -55,6 +55,8 @@ int getdns_context_fd(getdns_context* context);
 /* process async reqs */
 getdns_return_t getdns_context_process_async(getdns_context* context);
 
+/* tells underlying unbound to use background threads or fork */
+getdns_return_t getdns_context_set_use_threads(getdns_context* context, int use_threads);
 
 /* extensions */
 typedef void (*getdns_timeout_callback) (void* userarg);