The "Double-Checked Locking is Broken" Declaration - The Diigo Meta page

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  • is almost guaranteed not to work once the Java Memory Model is revised

  • However, even with a full memory barrier being performed by the thread that initializes the helper object, it still doesn't work.  

  • The problem is that on some systems, the thread which sees a non-null value for the helper field also needs to perform memory barriers.  

  • (e.g., a memory barrier), reads can be performed out of stale locally cached copies, even if other processors used memory barriers to force their writes into global memory.  
  • On some processors, unless the processor performs a cache coherence instruction

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  • However, there is no rule which says that actions after the monitorexit may not be done before the monitor is released.
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  Double-Checked Locking is widely cited and used as an efficient method for implementing lazy initialization in a multithreaded environment. Unfortunately, it will not work reliably in a platform independent way when implemented in Java, without additional

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  • JDK5 and later extends the semantics for volatile so that the system will not allow a write of a volatile to be reordered with respect to any previous read or write, and a read of a volatile cannot be reordered with respect to any following read or write.
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  Double-Checked Locking is widely cited and used as an efficient method for implementing lazy initialization in a multithreaded environment.
  
  Unfortunately, it will not work reliably in a platform independent way when implemented in Java. When implemente

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