crnlib/crn_spinlock.h

@@ -0,0 +1,38 @@
+// File: crn_spinlock.h
+// See Copyright Notice and license at the end of inc/crnlib.h
+#pragma once
+
+namespace crnlib
+{
+   // Simple non-recursive spinlock.   
+   class spinlock
+   {
+   public:
+      inline spinlock() : m_flag(0) { }
+            
+      void lock(uint32 max_spins = 4096, bool yielding = true, bool memoryBarrier = true);
+      
+      inline void lock_no_barrier(uint32 max_spins = 4096, bool yielding = true) { lock(max_spins, yielding, false); }
+
+      void unlock();
+            
+      inline void unlock_no_barrier() { m_flag = CRNLIB_FALSE; }
+
+   private:
+      volatile int32 m_flag;
+   };
+
+   class scoped_spinlock
+   {
+      scoped_spinlock(const scoped_spinlock&);
+      scoped_spinlock& operator= (const scoped_spinlock&);
+
+   public:
+      inline scoped_spinlock(spinlock& lock) : m_lock(lock) { m_lock.lock(); }
+      inline ~scoped_spinlock() { m_lock.unlock(); }
+
+   private:
+      spinlock& m_lock;
+   };
+   
+} // namespace crnlib