From 518c2d19e98ecef8b4616085480d66d13d22a702 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dominik=20Tomic=CC=8Cevic=CC=81?=
<dominik.tomicevic@gmail.com>
Date: Sat, 4 Jul 2015 11:50:42 +0200
Subject: [PATCH] moved sync directory to root
---
sync/spinlock.hpp | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
create mode 100644 sync/spinlock.hpp
diff --git a/sync/spinlock.hpp b/sync/spinlock.hpp
new file mode 100644
index 000000000..70559727a
--- /dev/null
+++ b/sync/spinlock.hpp
@@ -0,0 +1,29 @@
+#ifndef MEMGRAPH_UTILS_SYNC_SPINLOCK_HPP
+#define MEMGRAPH_UTILS_SYNC_SPINLOCK_HPP
+
+#include <atomic>
+#include <unistd.h>
+
+class SpinLock
+{
+public:
+
+ void lock()
+ {
+ // TODO add asm pause and counter first before sleeping
+ // might be faster, but test this and see
+ while(lock_flag.test_and_set(std::memory_order_acquire))
+ usleep(250);
+ }
+
+ void unlock()
+ {
+ lock_flag.clear(std::memory_order_release);
+ }
+
+private:
+ // guaranteed by standard to be lock free!
+ std::atomic_flag lock_flag = ATOMIC_FLAG_INIT;
+};
+
+#endif