ovs-atomic: Use raw types, not structs, when locks are required.

[sliver-openvswitch.git] / lib / ovs-atomic-locked.c

diff --git a/lib/ovs-atomic-locked.c b/lib/ovs-atomic-locked.c
new file mode 100644 (file)
index 0000000..dc2a435
--- /dev/null
+++ b/lib/ovs-atomic-locked.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2013, 2014 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <config.h>
+
+#include "ovs-atomic.h"
+#include "hash.h"
+#include "ovs-thread.h"
+
+#ifdef OVS_ATOMIC_LOCKED_IMPL
+static struct ovs_mutex *
+mutex_for_pointer(void *p)
+{
+    OVS_ALIGNED_STRUCT(CACHE_LINE_SIZE, aligned_mutex) {
+        struct ovs_mutex mutex;
+        char pad[PAD_SIZE(sizeof(struct ovs_mutex), CACHE_LINE_SIZE)];
+    };
+
+    static struct aligned_mutex atomic_mutexes[] = {
+#define MUTEX_INIT { .mutex = OVS_MUTEX_INITIALIZER }
+#define MUTEX_INIT4  MUTEX_INIT,  MUTEX_INIT,  MUTEX_INIT,  MUTEX_INIT
+#define MUTEX_INIT16 MUTEX_INIT4, MUTEX_INIT4, MUTEX_INIT4, MUTEX_INIT4
+        MUTEX_INIT16, MUTEX_INIT16,
+    };
+    BUILD_ASSERT_DECL(IS_POW2(ARRAY_SIZE(atomic_mutexes)));
+
+    uint32_t hash = hash_pointer(p, 0);
+    uint32_t indx = hash & (ARRAY_SIZE(atomic_mutexes) - 1);
+    return &atomic_mutexes[indx].mutex;
+}
+
+void
+atomic_lock__(void *p)
+    OVS_ACQUIRES(mutex_for_pointer(p))
+{
+    ovs_mutex_lock(mutex_for_pointer(p));
+}
+
+void
+atomic_unlock__(void *p)
+    OVS_RELEASES(mutex_for_pointer(p))
+{
+    ovs_mutex_unlock(mutex_for_pointer(p));
+}
+#endif /* OVS_ATOMIC_LOCKED_IMPL */