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If we have no special-case code in s_lock.h for the current platform, but the compiler has __sync_lock_test_and_set, use that instead of failing. It's unlikely that anybody's __sync_lock_test_and_set would be so awful as to be worse than our semaphore-based fallback, but if it is, they can (continue to) use --disable-spinlocks. This allows removal of the RISC-V special case installed by commit c32fcac56, which generated exactly the same code but only on that platform. Usefully, the RISC-V buildfarm animals should now test at least the int variant of this patch. I've manually tested both variants on ARM by dint of removing the ARM-specific stanza. We don't want to drop that, because it already has some special knowledge and is likely to grow more over time. Likewise, this is not meant to preclude installing special cases for other arches if that proves worthwhile. Per discussion of a request to install the same code for loongarch64. Like the previous patch, we might as well back-patch to supported branches. Discussion: https://postgr.es/m/761ac43d44b84d679ba803c2bd947cc0@HSMAILSVR04.hs.handsome.com.cn
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: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.