he UpgradeGuard is used to gain writer access for the thread that already has
a reading access. Hence, the constructor of the UpgradeGuard is
explicit UpgradeGuard(
ReaderGuard<X,Mutex>& guard );
The UpgradeGuard is similar to the WriterGuard in other parts of the
interface. See the section ( RWMutex_section)
for remarks on possibility of a deadlock.
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