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Andres Freund 80a8f95b3b Remove support for background workers without BGWORKER_SHMEM_ACCESS. ... Background workers without shared memory access have been broken on EXEC_BACKEND / windows builds since shortly after background workers have been introduced, without that being reported. Clearly they are not commonly used. The problem is that bgworker startup requires to be attached to shared memory in EXEC_BACKEND child processes. StartBackgroundWorker() detaches from shared memory for unconnected workers, but at that point we already have initialized subsystems referencing shared memory. Fixing this problem is not entirely trivial, so removing the option to not be connected to shared memory seems the best way forward. In most use cases the advantages of being connected to shared memory far outweigh the disadvantages. As there have been no reports about this issue so far, we have decided that it is not worth trying to address the problem in the back branches. Per discussion with Alvaro Herrera, Robert Haas and Tom Lane. Author: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/20210802065116.j763tz3vz4egqy3w@alap3.anarazel.de		4 years ago
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src	Remove support for background workers without BGWORKER_SHMEM_ACCESS.	4 years ago
KNOWN_BUGS	…
MISSING_FEATURES	…
Makefile	…
TODO	…