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This can be used to load an injection point and prewarm the backend-level cache before running it, to avoid issues if the point cannot be loaded due to restrictions in the code path where it would be run, like a critical section where no memory allocation can happen (load_external_function() can do allocations when expanding a library name). Tests can use a macro called INJECTION_POINT_LOAD() to load an injection point. The test module injection_points gains some tests, and a SQL function able to load an injection point. Based on a request from Andrey Borodin, who has implemented a test for multixacts requiring this facility. Reviewed-by: Andrey Borodin Discussion: https://postgr.es/m/ZkrBE1e2q2wGvsoN@paquier.xyz
67 lines
1.7 KiB
SQL
67 lines
1.7 KiB
SQL
/* src/test/modules/injection_points/injection_points--1.0.sql */
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-- complain if script is sourced in psql, rather than via CREATE EXTENSION
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\echo Use "CREATE EXTENSION injection_points" to load this file. \quit
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--
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-- injection_points_attach()
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--
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-- Attaches the action to the given injection point.
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--
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CREATE FUNCTION injection_points_attach(IN point_name TEXT,
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IN action text)
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RETURNS void
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AS 'MODULE_PATHNAME', 'injection_points_attach'
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LANGUAGE C STRICT PARALLEL UNSAFE;
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--
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-- injection_points_load()
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--
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-- Load an injection point already attached.
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--
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CREATE FUNCTION injection_points_load(IN point_name TEXT)
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RETURNS void
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AS 'MODULE_PATHNAME', 'injection_points_load'
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LANGUAGE C STRICT PARALLEL UNSAFE;
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--
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-- injection_points_run()
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--
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-- Executes the action attached to the injection point.
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--
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CREATE FUNCTION injection_points_run(IN point_name TEXT)
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RETURNS void
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AS 'MODULE_PATHNAME', 'injection_points_run'
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LANGUAGE C STRICT PARALLEL UNSAFE;
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--
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-- injection_points_wakeup()
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--
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-- Wakes up a waiting injection point.
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--
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CREATE FUNCTION injection_points_wakeup(IN point_name TEXT)
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RETURNS void
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AS 'MODULE_PATHNAME', 'injection_points_wakeup'
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LANGUAGE C STRICT PARALLEL UNSAFE;
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--
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-- injection_points_set_local()
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--
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-- Trigger switch to link any future injection points attached to the
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-- current process, useful to make SQL tests concurrently-safe.
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--
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CREATE FUNCTION injection_points_set_local()
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RETURNS void
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AS 'MODULE_PATHNAME', 'injection_points_set_local'
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LANGUAGE C STRICT PARALLEL UNSAFE;
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--
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-- injection_points_detach()
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--
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-- Detaches the current action, if any, from the given injection point.
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--
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CREATE FUNCTION injection_points_detach(IN point_name TEXT)
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RETURNS void
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AS 'MODULE_PATHNAME', 'injection_points_detach'
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LANGUAGE C STRICT PARALLEL UNSAFE;
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