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Related Images for Pattern Thread Safe
This implementation attempts to be thread-safe without the necessity of taking out a lock every time.
I was reading this best singleton implementation in java, but its not thread safe.
I wrote a long time ago what was basically a note to myself about implementing the singleton pattern in c++. here i will update and expand on some of the issues.
The double checked locking pattern looks like a simple way to ensure that we can make singletons thread safe.
Possible duplicate: efficient way to implement singleton pattern in java.