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queries over non-blocking connections with libpq. "Larger" here basically means that it doesn't fit into the output buffer. The basic strategy is to fix pqFlush and pqPutBytes. The problem with pqFlush as it stands now is that it returns EOF when an error occurs or when not all data could be sent. The latter case is clearly not an error for a non-blocking connection but the caller can't distringuish it from an error very well. The first part of the fix is therefore to fix pqFlush. This is done by to renaming it to pqSendSome which only differs from pqFlush in its return values to allow the caller to make the above distinction and a new pqFlush which is implemented in terms of pqSendSome and behaves exactly like the old pqFlush. The second part of the fix modifies pqPutBytes to use pqSendSome instead of pqFlush and to either send all the data or if not all data can be sent on a non-blocking connection to at least put all data into the output buffer, enlarging it if necessary. The callers of pqPutBytes don't have to be changed because from their point of view pqPutBytes behaves like before. It either succeeds in queueing all output data or fails with an error. I've also added a new API function PQsendSome which analogously to PQflush just calls pqSendSome. Programs using non-blocking queries should use this new function. The main difference is that this function will have to be called repeatedly (calling select() properly in between) until all data has been written. AFAICT, the code in CVS HEAD hasn't changed with respect to non-blocking queries and this fix should work there, too, but I haven't tested that yet. Bernhard Herzog |
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PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains several language bindings, including C, C++, Perl, Python, and Tcl, as well as drivers for JDBC and ODBC. See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.