Hi, While working on a related area, I noticed that shmem_startup_hook is called twice under EXEC_BACKEND.
The first call occurs in CreateSharedMemoryAndSemaphores() during postmaster startup (!IsUnderPostmaster), which is expected. The second call happens in AttachSharedMemoryStructs() (when EXEC_BACKEND is defined), and this occurs in normal backends (IsUnderPostmaster). The second call does not seem correct. The startup hook that should only run during postmaster initialization, AFAIK. Blame shows that this change was introduced in commit 69d903367c, but I could not determine the rationale from the discussion, so it may have been an oversight. Thoughts? -- Sami Imseih Amazon Web Services (AWS)
