From 2f749a2e0d38c5aae58fbf9947e9386e46ea1836 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sat, 17 Sep 2011 18:39:05 +0000
Subject: C++0x AtomicInt and AtomicPtr implementation.

git-svn-id: http://svn.drobilla.net/lad/trunk/raul@3468 a436a847-0d15-0410-975c-d299462d15a1
---
 raul/AtomicInt.hpp | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 raul/AtomicPtr.hpp | 35 ++++++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+)

(limited to 'raul')

diff --git a/raul/AtomicInt.hpp b/raul/AtomicInt.hpp
index 4aa6145..63d5071 100644
--- a/raul/AtomicInt.hpp
+++ b/raul/AtomicInt.hpp
@@ -18,6 +18,62 @@
 #ifndef RAUL_ATOMIC_INT_HPP
 #define RAUL_ATOMIC_INT_HPP
 
+#ifdef RAUL_CPP0x
+
+#include <atomic>
+
+/** Atomic integer.
+ * \ingroup raul
+ */
+class AtomicInt {
+public:
+	inline AtomicInt(int val) : _val(val) {}
+
+	inline AtomicInt(const AtomicInt& copy) : _val(copy.get()) {}
+
+	inline int get() const { return _val.load(); }
+
+	inline void operator=(int val) { _val = val; }
+ 
+	inline void operator+=(int val) { _val += val; }
+
+	inline void operator-=(int val) { _val -= val; }
+
+	inline bool operator==(int val) const { return _val == val; }
+
+	inline int operator+(int val) const { return _val + val; }
+
+	inline AtomicInt& operator++() { ++_val; return *this; }
+
+	inline AtomicInt& operator--() { --_val; return *this; }
+
+	/** Set value to @a val iff current value is @a old.
+	 * @return true iff set succeeded.
+	 */
+	inline bool compare_and_exchange(int old, int val) {
+		return _val.compare_exchange_strong(old, val);
+	}
+
+	/** Add val to value.
+	 * @return value immediately before addition took place.
+	 */
+	inline int exchange_and_add(int val) {
+		return _val.fetch_add(val);
+	}
+
+	/** Decrement value.
+	 * @return true if value is now 0, otherwise false.
+	 */
+	inline bool decrement_and_test() {
+		return _val.fetch_add(-1) == 0;
+	}
+
+private:
+	std::atomic<int> _val;
+};
+
+#else // !RAUL_CPP0x
+
 #include <glib.h>
 
 namespace Raul {
@@ -81,4 +137,6 @@ private:
 
 } // namespace Raul
 
+#endif // RAUL_CPP0x
+
 #endif // RAUL_ATOMIC_INT_HPP
diff --git a/raul/AtomicPtr.hpp b/raul/AtomicPtr.hpp
index 9c13271..28797de 100644
--- a/raul/AtomicPtr.hpp
+++ b/raul/AtomicPtr.hpp
@@ -18,6 +18,39 @@
 #ifndef RAUL_ATOMIC_PTR_HPP
 #define RAUL_ATOMIC_PTR_HPP
 
+#ifdef RAUL_CPP0x
+
+#include <atomic>
+
+namespace Raul {
+
+/** Atomic pointer.
+ * \ingroup raul
+ */
+template<typename T>
+class AtomicPtr {
+public:
+	inline AtomicPtr() : _val(NULL) {}
+
+	inline AtomicPtr(const AtomicPtr& copy) : _val(copy.get()) {}
+
+	inline T* get() const { return static_cast<T*>(_val.load()); }
+
+	inline void operator=(T* val) { _val = val; }
+
+	/** Set value to newval iff current value is oldval */
+	inline bool compare_and_exchange(void* oldval, void* newval) {
+		return _val.compare_exchange_strong(oldval, newval);
+	}
+
+private:
+	std::atomic<void*> _val;
+};
+
+} // namespace Raul
+
+#else // !RAUL_CPP0x
+
 #include <glib.h>
 
 namespace Raul {
@@ -51,4 +84,6 @@ private:
 
 } // namespace Raul
 
+#endif // RAUL_CPP0x
+
 #endif // RAUL_ATOMIC_PTR_HPP
-- 
cgit v1.2.1