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Prior to this patch, it was occasionally possible, after shm_mq_sendv had previously returned SHM_MQ_DETACHED, for a later shm_mq_sendv operation to fail an assertion instead of just again returning SHM_MQ_ATTACHED. From the shm_mq code's point of view, it was expecting to be called again with the same arguments, since the previous operation had only partially completed. However, a caller who isn't using non-blocking mode won't be prepared to repeat the call with the same arguments, and this code shouldn't expect that they will. Repair in such a way that we'll be OK whether the next call uses the same arguments or not. Found by Andreas Seltenreich. Analysis and sketch of fix by Amit Kapila. Patch by me, reviewed by Amit Kapila. |
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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 C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download 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. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.