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Viewing changes to plugin/single_thread/single_thread.cc

  • Committer: Brian Aker
  • Date: 2009-01-24 09:43:35 UTC
  • Revision ID: brian@gir-3.local-20090124094335-6qdtvc35gl5fvivz
Adding in an example singe thread scheduler

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plugin/single_thread/single_thread.cc
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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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#include "config.h"
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#include <plugin/single_thread/single_thread.h>
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#include <drizzled/server_includes.h>
 
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#include <drizzled/gettext.h>
 
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#include <drizzled/error.h>
 
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#include <drizzled/plugin_scheduling.h>
 
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#include <drizzled/serialize/serialize.h>
 
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#include <drizzled/connect.h>
 
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#include <drizzled/sql_parse.h>
 
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#include <drizzled/session.h>
 
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#include <drizzled/connect.h>
 
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#include <string>
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using namespace std;
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using namespace drizzled;
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/* Global's (TBR) */
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static SingleThreadScheduler *scheduler= NULL;
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static int init(plugin::Context &context)
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{
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  scheduler= new SingleThreadScheduler("single_thread");
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  context.add(scheduler);
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  return 0;
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}
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DRIZZLE_DECLARE_PLUGIN
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{
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  DRIZZLE_VERSION_ID,
 
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static bool init_dummy(void) {return 0;}
 
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/*
 
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  Simple scheduler that use the main thread to handle the request
 
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  NOTES
 
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  This is only used for debugging, when starting mysqld with
 
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  --thread-handling=no-threads or --one-thread
 
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  When we enter this function, LOCK_thread_count is hold!
 
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*/
 
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void handle_connection_in_main_thread(Session *session)
 
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{
 
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  safe_mutex_assert_owner(&LOCK_thread_count);
 
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  (void) pthread_mutex_unlock(&LOCK_thread_count);
 
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  handle_one_connection((void*) session);
 
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}
 
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/*
 
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  End connection, in case when we are using 'no-threads'
 
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*/
 
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static bool end_thread(Session *, bool)
 
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{
 
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  pthread_mutex_unlock(&LOCK_thread_count);
 
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  return true;                                     // Abort handle_one_connection
 
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}
 
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static int init(void *p)
 
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{
 
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  scheduler_functions* func= (scheduler_functions *)p;
 
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  func->max_threads= 1;
 
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  func->add_connection= handle_connection_in_main_thread;
 
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  func->init_new_connection_thread= init_dummy;
 
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  func->end_thread= end_thread;
 
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  return 0;
 
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}
 
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static int deinit(void *)
 
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{
 
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  return 0;
 
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}
 
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mysql_declare_plugin(single_thread)
 
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{
 
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  DRIZZLE_SCHEDULING_PLUGIN,
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  "single_thread",
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  "0.1",
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  "Brian Aker",
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  "Single Thread Scheduler",
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  PLUGIN_LICENSE_GPL,
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  init, /* Plugin Init */
 
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  deinit, /* Plugin Deinit */
 
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  NULL,   /* status variables */
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  NULL,   /* system variables */
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  NULL    /* config options */
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}
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DRIZZLE_DECLARE_PLUGIN_END;
 
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mysql_declare_plugin_end;