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Sometimes things are not called what they are, but a
condition variable really is a variable.
Namely, a condition variable is instantiated as
an object of type
boost::condition_variable.
boost::condition_variable tttt; // must have "global" scope |
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A condition variable does not literally have to
have global scope, but its scope must be available to all threads
that are using it and its scope must persist until all threads
that are using it are completed. In other word, the scope requirements
for a condition variable are usually identical
to the scope requirements
for a mutex.
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