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db93032a7c
Previously, on standby promotion, the startup process sent SIGUSR1 to the slotsync worker (or a backend performing slot synchronization) and waited for it to exit. This worked in most cases, but if the process was blocked waiting for a response from the primary (e.g., due to a network failure), SIGUSR1 would not interrupt the wait. As a result, the process could remain stuck, causing the startup process to wait for a long time and delaying promotion. This commit fixes the issue by introducing a new procsignal reason, PROCSIG_SLOTSYNC_MESSAGE. On promotion, the startup process sends this signal, and the handler sets interrupt flags so the process exits (or errors out) promptly at CHECK_FOR_INTERRUPTS(), allowing promotion to complete without delay. Backpatch to v17, where slotsync was introduced. Author: Nisha Moond <nisha.moond412@gmail.com> Reviewed-by: shveta malik <shveta.malik@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Reviewed-by: Zhijie Hou <houzj.fnst@fujitsu.com> Reviewed-by: Fujii Masao <masao.fujii@gmail.com> Discussion: https://postgr.es/m/CAHGQGwFzNYroAxSoyJhqTU-pH=t4Ej6RyvhVmBZ91Exj_TPMMQ@mail.gmail.com Backpatch-through: 17