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f5bfba5413
With the old logic, when the reciever had not yet attached, we would never call shm_mq_inc_bytes_written(), even if force_flush = true was specified. That could result in a situation where data that the sender believes it has sent is never received. Along the way, remove a useless function prototype for a nonexistent function from shm_mq.h. Commit 46846433a03dff4f2e08c8a161e54a842da360d6 introduced these problems. Pavan Deolasee, with a few changes by me. Discussion: https://postgr.es/m/CABOikdPkwtLLCTnzzmpSMXo3QZa2yXq0J7Q61ssdLFAJYrOVvQ@mail.gmail.com