From 8a2fd3b8efc2de080349c4ab50a314748adc2699 Mon Sep 17 00:00:00 2001
From: dimitri staessens <dimitri.staessens@ugent.be>
Date: Tue, 4 Apr 2017 20:24:13 +0200
Subject: lib: Fix insertion in lockless rbuff

---
 src/lib/shm_rbuff_ll.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'src/lib/shm_rbuff_ll.c')

diff --git a/src/lib/shm_rbuff_ll.c b/src/lib/shm_rbuff_ll.c
index d777de8b..1e072b21 100644
--- a/src/lib/shm_rbuff_ll.c
+++ b/src/lib/shm_rbuff_ll.c
@@ -244,14 +244,14 @@ int shm_rbuff_write(struct shm_rbuff * rb,
 
         nhead = RB_HEAD;
 
+        *(rb->shm_base + nhead) = (ssize_t) idx;
+
         do {
                 ohead = nhead;
                 nhead = (ohead + 1) & ((SHM_BUFFER_SIZE) - 1);
                 nhead = __sync_val_compare_and_swap(rb->head, ohead, nhead);
         } while (nhead != ohead);
 
-        *(rb->shm_base + nhead) = (ssize_t) idx;
-
         if (was_empty)
                 pthread_cond_broadcast(rb->add);
 
-- 
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