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9b4eafcaf4
Currently there is a race condition where if concurrent TAP tests both test that they can open a port they will assume that it is free and use it, causing one of them to fail. To prevent this we record a reservation using an exclusive lock, and any TAP test that discovers a reservation checks to see if the reserving process is still alive, and looks for another free port if it is. Ports are reserved in a directory set by the environment setting PG_TEST_PORT_DIR, or if that doesn't exist a subdirectory of the top build directory as set by meson or Makefile.global, or its own tmp_check directory. The prove_check recipe in Makefile.global.in is extended to export top_builddir to the TAP tests. This was already exported by the prove_installcheck recipes. Per complaint from Andres Freund This will be backpatched in due course after some testing. Discussion: https://postgr.es/m/20221002164931.d57hlutrcz4d2zi7@awork3.anarazel.de