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A Slight Variant: Allowing Mu ltiple Instances The previous example prevents multiple invocations of the m_f a c t o ry delegate by using a lock Often this is what you want, particularly if the object that is being lazily allocated is expensive to create and destroy But this is strictly stronger than necessary to prevent multiple objects from being published It also dis qualifies the L a z y I n i t < T > primitive from being nonblocking because, under certain circumstances, threads may block, specifically, if they all race to initialize the object simultaneously We can make a slight change to the above algorithm to enable this relax ation and to provide our first example of a truly wait free algorithm
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c l a s s L a z y l n itRelaxedRef<T> where T : c l a s s { p rivate volat i l e T m_v a l u e j p r i v a t e F u n c < T > m_fa ctorY j p u b l i c L a z y I n it ( F u n c < T > factory ) { m_factory public T Value { Get { if ( m_va l u e null ) I n t e r l o c k e d Compa r e E x c h a nge ( ref m_v a l u e , m_fac tory ( ) , n U l l ) j ret u r n m_va l u e j } } }
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The code has become simpler If m_v a l u e is seen to be n u l l, a thread will attempt to perform an I n t e r l o c k e d Comp a r e E x c h a n g e : if m_v a l u e is still n u l l after creating a new object by invoking m_f a c t o ry, this new object will be published No matter whether this succeeds or not, we always return m_v a l u e This is actually wait free because a thread will complete the operation in one step, no matter if it succeeds or not No single thread can prevent progress of another in the system If the I n t e r loc ked Comp a r e E x c h a nge fails, we will have created a garbage object Given that lazy initialization is typically meant for expensive object creation, it is likely that such objects will implement I D i s p o s a b l e; in
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c l a s s LazylnitRelaxedRef < T > where T : c l a s s { if ( m_va l u e
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Notice again that we've constrained T to be a reference type The reason is that we can' t always publish the whole structure with a single I n t e r loc ked Compa r e E x c h a nge To facilitate this, we need to wrap the value type in a heap allocated object
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