Add missing file.

src/nvthread/Atomic.h

@@ -0,0 +1,144 @@
+// This code is in the public domain -- castanyo@yahoo.es
+
+#ifndef NV_THREAD_ATOMIC_H
+#define NV_THREAD_ATOMIC_H
+
+#include "nvthread.h"
+
+#include "nvcore/Debug.h"
+
+
+#if NV_CC_MSVC
+
+#include <intrin.h> // Already included by nvthread.h
+
+#pragma intrinsic(_InterlockedIncrement, _InterlockedDecrement)
+#pragma intrinsic(_InterlockedCompareExchange, _InterlockedExchange)
+
+/*
+extern "C"
+{
+    #pragma intrinsic(_InterlockedIncrement, _InterlockedDecrement)
+    LONG  __cdecl _InterlockedIncrement(long volatile *Addend);
+    LONG  __cdecl _InterlockedDecrement(long volatile *Addend);
+
+    #pragma intrinsic(_InterlockedCompareExchange, _InterlockedExchange)
+    LONG  __cdecl _InterlockedCompareExchange(long volatile * Destination, long Exchange, long Compared);
+    LONG  __cdecl _InterlockedExchange(long volatile * Target, LONG Value);
+}
+*/
+
+#endif // NV_CC_MSVC
+
+
+namespace nv {
+
+    // Load and stores.
+	inline uint32 loadRelaxed(const uint32 * ptr) { return *ptr; }
+	inline void storeRelaxed(uint32 * ptr, uint32 value) { *ptr = value; }
+
+	inline uint32 loadAcquire(const volatile uint32 * ptr)
+    {
+        nvDebugCheck((intptr_t(ptr) & 3) == 0);
+
+#if POSH_CPU_X86 || POSH_CPU_X86_64
+        nvCompilerReadBarrier();
+		uint32 ret = *ptr;  // on x86, loads are Acquire
+        nvCompilerReadBarrier();
+        return ret;
+#else
+#error "Not implemented"
+#endif
+    }
+
+	inline void storeRelease(volatile uint32 * ptr, uint32 value)
+    {
+        nvDebugCheck((intptr_t(ptr) & 3) == 0);
+        nvDebugCheck((intptr_t(&value) & 3) == 0);
+
+#if POSH_CPU_X86 || POSH_CPU_X86_64
+        nvCompilerWriteBarrier();
+		*ptr = value;   // on x86, stores are Release
+		nvCompilerWriteBarrier();
+#else
+#error "Not implemented"
+#endif
+    }
+
+
+    // Atomics. @@ Assuming sequential memory order?
+
+#if NV_CC_MSVC
+    NV_COMPILER_CHECK(sizeof(uint32) == sizeof(long));
+
+    inline uint32 atomicIncrement(uint32 * value)
+    {
+        nvDebugCheck((intptr_t(value) & 3) == 0);
+
+        return (uint32)_InterlockedIncrement((long *)value);
+    }
+
+    inline uint32 atomicDecrement(uint32 * value)
+    {
+        nvDebugCheck((intptr_t(value) & 3) == 0);
+
+        return (uint32)_InterlockedDecrement((long *)value);
+    }
+#endif
+
+
+
+
+    // It would be nice to have C++0x-style atomic types, but I'm not in the mood right now. Only uint32 supported so far.
+#if 0
+    template <typename T>
+    void increment(T * value);
+
+    template <typename T>
+    void decrement(T * value);
+
+    template <>
+    void increment(uint32 * value) {
+    }
+
+    template <>
+    void increment(uint64 * value) {
+    }
+
+
+
+	template <typename T>
+	class Atomic
+	{
+	public:
+		explicit Atomic()  : m_value() { }
+		explicit Atomic( T val ) : m_value(val) { }
+		~Atomic() { }
+		
+		T loadRelaxed()  const { return m_value; }
+		void storeRelaxed(T val) { m_value = val; }
+
+        //T loadAcquire() const volatile { return nv::loadAcquire(&m_value); }
+		//void storeRelease(T val) volatile { nv::storeRelease(&m_value, val); }
+
+        void increment() /*volatile*/ { nv::atomicIncrement(m_value); }
+        void decrement() /*volatile*/ { nv::atomicDecrement(m_value); }
+
+        void compareAndStore(T oldVal, T newVal) { nv::atomicCompareAndStore(&m_value, oldVal, newVal); }
+        T compareAndExchange(T oldVal, T newVal) { nv::atomicCompareAndStore(&m_value, oldVal, newVal); }
+        T exchange(T newVal) { nv::atomicExchange(&m_value, newVal); }
+
+	private:
+		// don't provide operator = or == ; make the client write Store( Load() )
+		NV_FORBID_COPY(Atomic);
+		
+		NV_COMPILER_CHECK(sizeof(T) == sizeof(uint32) || sizeof(T) == sizeof(uint64));
+		
+		T m_value;
+	};
+#endif
+
+} // nv namespace 
+
+
+#endif // NV_THREADS_ATOMICS_H