The way I understand, you use threads::shared; and then SvLOCK and SvUNLOCK will call threads::shared::lock, but if threads::shared isn't loaded, it falls back to sv_nolocking and sv_nounlocking

In reply to Re^2: threads::shared locking via C API by Anonymous Monk
in thread threads::shared locking via C API by halfcountplus

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