From c30f54ad732ca5c8762bb68bbe0f51de9137dd72 Mon Sep 17 00:00:00 2001 From: Thomas Munro Date: Sat, 3 Apr 2021 08:52:30 +1300 Subject: Detect POLLHUP/POLLRDHUP while running queries. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Provide a new GUC check_client_connection_interval that can be used to check whether the client connection has gone away, while running very long queries. It is disabled by default. For now this uses a non-standard Linux extension (also adopted by at least one other OS). POLLRDHUP is not defined by POSIX, and other OSes don't have a reliable way to know if a connection was closed without actually trying to read or write. In future we might consider trying to send a no-op/heartbeat message instead, but that could require protocol changes. Author: Sergey Cherkashin Author: Thomas Munro Reviewed-by: Thomas Munro Reviewed-by: Tatsuo Ishii Reviewed-by: Konstantin Knizhnik Reviewed-by: Zhihong Yu Reviewed-by: Andres Freund Reviewed-by: Maksim Milyutin Reviewed-by: Tsunakawa, Takayuki/綱川 貴之 Reviewed-by: Tom Lane (much earlier version) Discussion: https://postgr.es/m/77def86b27e41f0efcba411460e929ae%40postgrespro.ru --- src/backend/utils/init/globals.c | 1 + 1 file changed, 1 insertion(+) (limited to 'src/backend/utils/init/globals.c') diff --git a/src/backend/utils/init/globals.c b/src/backend/utils/init/globals.c index 73e0a672ae3..a9f0fc3017c 100644 --- a/src/backend/utils/init/globals.c +++ b/src/backend/utils/init/globals.c @@ -30,6 +30,7 @@ ProtocolVersion FrontendProtocol; volatile sig_atomic_t InterruptPending = false; volatile sig_atomic_t QueryCancelPending = false; volatile sig_atomic_t ProcDiePending = false; +volatile sig_atomic_t CheckClientConnectionPending = false; volatile sig_atomic_t ClientConnectionLost = false; volatile sig_atomic_t IdleInTransactionSessionTimeoutPending = false; volatile sig_atomic_t IdleSessionTimeoutPending = false; -- cgit v1.2.3