Hi, Attached is an example of how StringBuilder could be made thread safe and still enable sharing the char[]. Unfortunately it requires allocating an extra temp object and JIT magic, but maybe someone is interested in pursuing this (I'm not because I have to special case StringBuilder in another way).
Note that you could also get rid of the temporary object by using a String instance for this, but that would require making the value and count fields of String non-final and this has memory model consequences as well (thereby making String non-portable). Regards, Jeroen
StringBuilder.java
Description: StringBuilder.java
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