Horiguchi-san
Thank you for your comment.
> A connection cannot be concurrently used by multiple threads so
> the programmer must guard connections using mutex [1] or
> friends. If it is done by a single mutex (I suppose it is
> common.), there's no race condition also on the prepared
> statement storage. I'm not sure it is explicitly aimed but I
> suppose that there's no problem in a common usage of the library.
I understand it, but current scope of StatementCache and DeclareStatementList seems not
to be limitted within each connection, isn't it?
Therefore, I thought the operation on them must be thread safe.
For example, scope of DescriptorList in descriptor.c is within thread (not connection)
by using pthread_getspecific/ pthread_setspecific().
Regards
Ryo Matsumura