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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008 Sun Microsystems
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Functions to autenticate and handle reqests for a connection
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#include <drizzled/server_includes.h>
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#include <drizzled/error.h>
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#include <drizzled/sql_parse.h>
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#include <drizzled/scheduling.h>
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#include <drizzled/session.h>
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#include <drizzled/connect.h>
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Initialize connection threads
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bool init_new_connection_handler_thread()
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Thread handler for a connection
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handle_one_connection()
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arg Connection object (Session)
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This function (normally) does the following:
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- Initialize Session to be used with this thread
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- Execute all queries sent on the connection
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- Take connection down
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- End thread / Handle next connection using thread from thread cache
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pthread_handler_t handle_one_connection(void *arg)
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Session *session= static_cast<Session*>(arg);
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uint32_t launch_time= (uint32_t) ((session->thr_create_utime= my_micro_time()) -
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session->connect_utime);
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Scheduler &thread_scheduler= get_thread_scheduler();
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if (thread_scheduler.init_new_connection_thread())
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session->disconnect(ER_OUT_OF_RESOURCES, true);
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statistic_increment(aborted_connects,&LOCK_status);
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thread_scheduler.end_thread(session,0);
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if (launch_time >= slow_launch_time*1000000L)
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statistic_increment(slow_launch_threads,&LOCK_status);
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handle_one_connection() is normally the only way a thread would
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start and would always be on the very high end of the stack ,
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therefore, the thread stack always starts at the address of the
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first local variable of handle_one_connection, which is session. We
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need to know the start of the stack so that we could check for
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session->thread_stack= (char*) &session;
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if (! session->initGlobals())
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NET *net= &session->net;
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if (! session->authenticate())
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session->prepareForQueries();
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while (!net->error && net->vio != 0 &&
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!(session->killed == Session::KILL_CONNECTION))
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if (! session->executeStatement())
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session->disconnect(0, true);
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if (thread_scheduler.end_thread(session, 1))
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return 0; // Probably no-threads
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If end_thread() returns, we are either running with
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thread-handler=no-threads or this thread has been schedule to
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handle the next connection.
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session= current_session;
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session->thread_stack= (char*) &session;