I have simplified the code according to the discussion. Now there is no pipe or signaling threads, process access shared memory directly to pass signals. Seems everything works fine except pg_ctl. I now have two choices to fix it:
(1) Record Shared memory name (it is already there) and the offset of signaling shared memory in postmaster.pid; So the pg_ctl program can access the shared memory (since it has write down the signal number there) and SetEvent target process; (2) Postmaster will startup a thread monitoring messages, pg_ctl simulate "kill" by sending postmaster a message <target_pid, signum>, then postmaster will forward this "signum" to "target_pid"; What do you think? Regards, Qingqing ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend
