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Until now StartBufferIO() had a few weaknesses: - As it did not submit staged IOs, it was not safe to call StartBufferIO() where there was a potential for unsubmitted IO, which required AsyncReadBuffers() to use a wrapper (ReadBuffersCanStartIO()) around StartBufferIO(). - With nowait = true, the boolean return value did not allow to distinguish between no IO being necessary and having to wait, which would lead ReadBuffersCanStartIO() to unnecessarily submit staged IO. - Several callers needed to handle both local and shared buffers, requiring the caller to differentiate between StartBufferIO() and StartLocalBufferIO() - In a future commit some callers of StartBufferIO() want the BufferDesc's io_wref to be returned, to asynchronously wait for in-progress IO - Indicating whether to wait with the nowait parameter was somewhat confusing compared to a wait parameter Address these issues as follows: - StartBufferIO() is renamed to StartSharedBufferIO() - A new StartBufferIO() is introduced that supports both shared and local buffers - The boolean return value has been replaced with an enum, indicating whether the IO is already done, already in progress or that the buffer has been readied for IO - A new PgAioWaitRef * argument allows the caller to get the wait reference is desired. All current callers pass NULL, a user of this will be introduced subsequently - Instead of the nowait argument there now is wait This probably would not have been worthwhile on its own, but since all these lines needed to be touched anyway... Author: Andres Freund <andres@anarazel.de> Author: Melanie Plageman <melanieplageman@gmail.com> Discussion: https://postgr.es/m/zljergweqti7x67lg5ije2rzjusie37nslsnkjkkby4laqqbfw@3p3zu522yykv |
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