update LOAD_SHARED/STORE_SHARED for need_mb.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>

diff --git a/urcu.c b/urcu.c
index 140cd19b98add54f276755e08b13bfad9e8c3d0c..a3ceca3f5263be7812288f4e909eed6878246980 100644 (file)
--- a/urcu.c
+++ b/urcu.c
@@ -99,9 +99,9 @@ static void mutex_lock(pthread_mutex_t *mutex)
                        perror("Error in pthread mutex lock");
                        exit(-1);
                }
-               if (rcu_reader.need_mb) {
+               if (LOAD_SHARED(rcu_reader.need_mb)) {
                        smp_mb();
-                       rcu_reader.need_mb = 0;
+                       _STORE_SHARED(rcu_reader.need_mb, 0);
                        smp_mb();
                }
                poll(NULL,0,10);
@@ -155,8 +155,7 @@ static void force_mb_all_readers(void)
         * cache flush is enforced.
         */
        list_for_each_entry(index, &registry, head) {
-               index->need_mb = 1;
-               smp_mc();       /* write need_mb before sending the signal */
+               STORE_SHARED(index->need_mb, 1);
                pthread_kill(index->tid, SIGRCU);
        }
        /*
@@ -173,7 +172,7 @@ static void force_mb_all_readers(void)
         * the Linux Test Project (LTP).
         */
        list_for_each_entry(index, &registry, head) {
-               while (index->need_mb) {
+               while (LOAD_SHARED(index->need_mb)) {
                        pthread_kill(index->tid, SIGRCU);
                        poll(NULL, 0, 1);
                }
@@ -382,7 +381,7 @@ static void sigrcu_handler(int signo, siginfo_t *siginfo, void *context)
         * executed on.
         */
        smp_mb();
-       rcu_reader.need_mb = 0;
+       _STORE_SHARED(rcu_reader.need_mb, 0);
        smp_mb();
 }