X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=urcu-bp.c;h=9c7da3d8d235355246de95dfb5de87c8dcc1fec8;hb=288b842166255327245cb4e8a05ea34b79504e04;hp=cbdebf407a892c2d201d42d948025723702414e7;hpb=e44dd88adfc9a89b6cd7393163bc0d680d292f4d;p=userspace-rcu.git

diff --git a/urcu-bp.c b/urcu-bp.c
index cbdebf4..9c7da3d 100644
--- a/urcu-bp.c
+++ b/urcu-bp.c
@@ -373,7 +373,8 @@ void expand_arena(struct registry_arena *arena)
 			sizeof(struct registry_chunk)
 			+ sizeof(struct rcu_reader));
 		new_chunk_len = ARENA_INIT_ALLOC;
-		new_chunk = mmap(NULL, new_chunk_len,
+		new_chunk = (struct registry_chunk *) mmap(NULL,
+			new_chunk_len,
 			PROT_READ | PROT_WRITE,
 			MAP_ANONYMOUS | MAP_PRIVATE,
 			-1, 0);
@@ -407,7 +408,8 @@ void expand_arena(struct registry_arena *arena)
 	}
 
 	/* Remap did not succeed, we need to add a new chunk. */
-	new_chunk = mmap(NULL, new_chunk_len,
+	new_chunk = (struct registry_chunk *) mmap(NULL,
+		new_chunk_len,
 		PROT_READ | PROT_WRITE,
 		MAP_ANONYMOUS | MAP_PRIVATE,
 		-1, 0);
@@ -579,6 +581,17 @@ void urcu_bp_thread_exit_notifier(void *rcu_key)
 	rcu_bp_unregister(rcu_key);
 }
 
+static
+void rcu_sys_membarrier_status(int available)
+{
+	/*
+	 * membarrier has blocking behavior, which changes the
+	 * application behavior too much compared to using barriers when
+	 * synchronize_rcu is used repeatedly (without using call_rcu).
+	 * Don't use membarrier for now.
+	 */
+}
+
 static
 void rcu_bp_init(void)
 {
@@ -591,9 +604,8 @@ void rcu_bp_init(void)
 		if (ret)
 			abort();
 		ret = membarrier(MEMBARRIER_CMD_QUERY, 0);
-		if (ret >= 0 && (ret & MEMBARRIER_CMD_SHARED)) {
-			urcu_bp_has_sys_membarrier = 1;
-		}
+		rcu_sys_membarrier_status(ret >= 0
+				&& (ret & MEMBARRIER_CMD_SHARED));
 		initialized = 1;
 	}
 	mutex_unlock(&init_lock);
@@ -609,7 +621,7 @@ void rcu_bp_exit(void)
 
 		cds_list_for_each_entry_safe(chunk, tmp,
 				&registry_arena.chunk_list, node) {
-			munmap(chunk, chunk->data_len
+			munmap((void *) chunk, chunk->data_len
 					+ sizeof(struct registry_chunk));
 		}
 		CDS_INIT_LIST_HEAD(&registry_arena.chunk_list);