Threadsafe connection #1395
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Threadsafe connection #1395
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The connection holder should be performant in all variants: 1. single-threaded use 2. opened once (open forever) 3. concurrent open/close Hence, a light-weight binary semaphore is used to synchronize opening and closing a database connection.
A user-provided 'on open' handler and connection control options can now be specified in a declarative way when making the 'storage' object.
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With C++20 a more light-weight binary semaphore can be conditionally used to synchronize opening and closing a database connection.
Therefore, the connection holder should be minimally invasive and performant in all variants:
Note: One important change is that things involved around setting up a database connection - like creating application-defined functions, setting pragma or limit values - must be done under the same synchronization point right after opening the database.
Caveat: Currently the connection cannot yet be recursively retained; think: user-provided 'on open' handlers.