Rebase of PR 807: non-blocking behavior for next_result - #962
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when actually preforming a multi-statement select with any non-trivial components, the `next_result` call will block the ruby interpreter. We fix this in two ways: First, we wrap up the actual mysql_next_result call in a "no-gvl" call so that the interpreter can do other work while next_result is happening. Second, we borrow a method from do_query and spin in a select() loop on the mysql socket until the query is ready. A quick source dive into the underlying mysql source shows that next_result() falls into the same path as mysql_real_query (cli_read_query_result), so this should be a safe method.
Rather than including violite.h to be able to look into the net.vio structure to call its has_data function pointer, we borrow the definitions of just two functions that understand this structure. The underlying client library may have pre-read the results from the next query, so wait_for_fd would not be triggered. Instead we will ask whether the net.vio structure has additional data that hasn't been parsed. Hack: use knowledge of whether the connecti is SSL or not to call the appropriate has_data function and pass net.vio as an opaque structure. Definitions are from vio_priv.h
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There are actually more possible states than my implementation accounts for. I'm not sure if there's a clean way to do this without the underlying methods exposed. |
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Rebase of #807
/cc @osheroff