shm_mq: Fix detach race condition. Commit 34db06ef9a1d7f36391c64293bf1e0ce44a33915 adopted a lock-free design for shm_mq.c, but it introduced a race condition that could lose messages. When shm_mq_receive_bytes() detects that the other end has detached, it must make sure that it has seen the final version of mq_bytes_written, or it might miss a message sent before detaching.
Thomas Munro Discussion: https://postgr.es/m/CAEepm%3D2myZ4qxpt1a%3DC%2BwEv3o188K13K3UvD-44FK0SdAzHy%2Bw%40mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/42d7074ebb832e511d1edec8091cd474d169eef1 Modified Files -------------- src/backend/storage/ipc/shm_mq.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
