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a0a5869a85
This new macro is able to perform a direct lookup from the local cache of injection points (refreshed each time a point is loaded or run), without touching the shared memory state of injection points at all. This works in combination with INJECTION_POINT_LOAD(), and it is better than INJECTION_POINT() in a critical section due to the fact that it would avoid all memory allocations should a concurrent detach happen since a LOAD(), as it retrieves a callback from the backend-private memory. The documentation is updated to describe in more details how to use this new macro with a load. Some tests are added to the module injection_points based on a new SQL function that acts as a wrapper of INJECTION_POINT_CACHED(). Based on a suggestion from Heikki Linnakangas. Author: Heikki Linnakangas, Michael Paquier Discussion: https://postgr.es/m/58d588d0-e63f-432f-9181-bed29313dece@iki.fi |
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