main->PostmasterMain->ServerLoop: for(;;){ ... //會阻塞在這,監(jiān)視文件描述符的變化 selres = select(nSockets, &rmask, NULL, NULL, &timeout); if (selres > 0){ for (i = 0; i < MAXLISTEN; i++){ //找一個(gè)有效的fd if (ListenSocket[i] == PGINVALID_SOCKET) break; if (FD_ISSET(ListenSocket[i], &rmask)){ port = ConnCreate(ListenSocket[i]);->StreamConnection->accept BackendStartup(port);//fork進(jìn)程 |-- pid = fork_process(); | if (pid == 0){//child | InitPostmasterChild(); | ClosePostmasterPorts(false); | BackendInitialize(port); | //該函數(shù)不會返回 | BackendRun(port);->PostgresMain: | |-- for (;;){ | | if (send_ready_for_query){ | | ... | | ReadyForQuery(whereToSendOutput);->pq_flush();->internal_flush->secure_write->secure_raw_write->send | | send_ready_for_query = false; | | } | | firstchar = ReadCommand(&input_message); | | switch(firstchar):{ | | case 'Q':exec_simple_query(query_string); | | ... | | } | |-- } | } | ...father |-- return STATUS_OK //關(guān)閉father socket StreamClose(port->sock); ConnFree(port); } } } }
標(biāo)題名稱:PostgreSQLserver端接收連接后fork進(jìn)程
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