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Viewing changes to plugin/multi_thread/multi_thread.h

  • Committer: Eric Herman
  • Date: 2008-12-07 15:29:44 UTC
  • mto: (656.1.14 devel)
  • mto: This revision was merged to the branch mainline in revision 670.
  • Revision ID: eric@mysql.com-20081207152944-cq1nx1cyi0huqj0f
Added pointer to online version of the FAQ

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plugin/multi_thread/multi_thread.h
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/* Copyright (C) 2009 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
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#ifndef PLUGIN_MULTI_THREAD_MULTI_THREAD_H
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#define PLUGIN_MULTI_THREAD_MULTI_THREAD_H
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#include <drizzled/atomics.h>
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#include <drizzled/gettext.h>
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#include <drizzled/error.h>
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#include <drizzled/plugin/scheduler.h>
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#include "drizzled/internal/my_sys.h"
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#include <drizzled/sql_parse.h>
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#include <drizzled/session.h>
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#include <string>
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class MultiThreadScheduler: public drizzled::plugin::Scheduler
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{
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private:
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  drizzled::atomic<uint32_t> thread_count;
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  pthread_attr_t attr;
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public:
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  MultiThreadScheduler(const char *name_arg): 
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    Scheduler(name_arg)
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  {
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    struct sched_param tmp_sched_param;
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    memset(&tmp_sched_param, 0, sizeof(struct sched_param));
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    /* Setup attribute parameter for session threads. */
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    (void) pthread_attr_init(&attr);
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    (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
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    pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
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    tmp_sched_param.sched_priority= WAIT_PRIOR;
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    (void) pthread_attr_setschedparam(&attr, &tmp_sched_param);
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    thread_count= 0;
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  }
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  ~MultiThreadScheduler();
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  bool addSession(drizzled::Session *session);
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  void killSessionNow(drizzled::Session *session);
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  void runSession(drizzled::Session *session)
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  {
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    if (drizzled::internal::my_thread_init())
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    {
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      session->disconnect(drizzled::ER_OUT_OF_RESOURCES, true);
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      statistic_increment(drizzled::aborted_connects, &LOCK_status);
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      killSessionNow(session);
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    }
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    session->thread_stack= (char*) &session;
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    session->run();
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    killSessionNow(session);
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  }
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};
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#endif /* PLUGIN_MULTI_THREAD_MULTI_THREAD_H */