From 70399f1c8cae6e9ddd43cd28ecdaf17c96274c65 Mon Sep 17 00:00:00 2001
From: Matthias Andreas Benkard <code@mail.matthias.benkard.de>
Date: Thu, 1 Sep 2011 19:51:19 +0200
Subject: Use GCC-specific atomic memory access primitives for reference
 counting.

---
 bitmapped_patricia_tree.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/bitmapped_patricia_tree.c b/bitmapped_patricia_tree.c
index ca36271..79ac076 100644
--- a/bitmapped_patricia_tree.c
+++ b/bitmapped_patricia_tree.c
@@ -435,13 +435,13 @@ static unsigned int bpt_find_diverging_chunk(bpt_key_t a, bpt_key_t b) {
 
 void bpt_retain(bpt_t bpt) {
   if (bpt) {
-    bpt->refcount++;
+    __sync_fetch_and_add(&bpt->refcount, 1);
   }
 }
 
 void bpt_release(bpt_t bpt) {
   if (bpt) {
-    if (--(bpt->refcount) == 0) {
+    if (__sync_sub_and_fetch(&bpt->refcount, 1) == 0) {
       bpt_dealloc(bpt);
     }
   }
-- 
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