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The macros INJECTION_POINT() and INJECTION_POINT_CACHED() are extended with an optional argument that can be passed down to the callback attached when an injection point is run, giving to callbacks the possibility to manipulate a stack state given by the caller. The existing callbacks in modules injection_points and test_aio have their declarations adjusted based on that. da7226993fd4 (core AIO infrastructure) and 93bc3d75d8e1 (test_aio) and been relying on a set of workarounds where a static variable called pgaio_inj_cur_handle is used as runtime argument in the injection point callbacks used by the AIO tests, in combination with a TRY/CATCH block to reset the argument value. The infrastructure introduced in this commit will be reused for the AIO tests, simplifying them. Reviewed-by: Greg Burd <greg@burd.me> Discussion: https://postgr.es/m/Z_y9TtnXubvYAApS@paquier.xyz