"is ||= in ruby thread safe?" Code Answer
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it depends on the implementation. be aware that
x ||= yexpands tox || x = y, and thatx = yis only executed ifxis eitherfalseornil.with that said, the c implementation of the ruby language should be completely thread safe.
yarv uses native threads in order to implement concurrency, which do run in true parallel. however, in order to maintain backward compatibility, a global, interpreter-wide lock was introduced.
jruby, however, imposes no internal locking on your code, so you must manually synchronize your calls when needed.
see another answer i've given about the subject for more details. also, read this excellent answer by jörg w mittag for a more in-depth look at the threading models of the various ruby implementations.