Fix outdated comments
Commit 597a87ccc9
neglected to update some comments; fix.
Report and patch by Thomas Munro.
Reviewed by Petr Jelínek.
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@ -388,15 +388,12 @@ libpqrcv_readtimelinehistoryfile(WalReceiverConn *conn,
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/*
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* Send a query and wait for the results by using the asynchronous libpq
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* functions and the backend version of select().
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* functions and socket readiness events.
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*
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* We must not use the regular blocking libpq functions like PQexec()
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* since they are uninterruptible by signals on some platforms, such as
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* Windows.
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*
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* We must also not use vanilla select() here since it cannot handle the
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* signal emulation layer on Windows.
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*
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* The function is modeled on PQexec() in libpq, but only implements
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* those parts that are in use in the walreceiver.
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*
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