Christopher Faulet e95f2c3ef5 MEDIUM: thread/vars: Make vars thread-safe
A RW lock has been added to the vars structure to protect each list of
variables. And a global RW lock is used to protect registered names.

When a varibable is fetched, we duplicate sample data because the variable could
be modified by another thread.
2017-10-31 13:58:32 +01:00
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