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📁 user	--	drwxr-xr-x
🐘 about.php	17.572 KB	-rw-r--r--
🐘 admin-ajax.php	5.025 KB	-rw-r--r--
🐘 admin-footer.php	2.738 KB	-rw-r--r--
🐘 admin-functions.php	0.461 KB	-rw-r--r--
🐘 admin-header.php	9.066 KB	-rw-r--r--
🐘 admin-post.php	1.974 KB	-rw-r--r--
🐘 admin.php	12.632 KB	-rw-r--r--
🐘 async-upload.php	5.473 KB	-rw-r--r--
🐘 authorize-application.php	10.093 KB	-rw-r--r--
🐘 comment.php	11.37 KB	-rw-r--r--
🐘 contribute.php	5.523 KB	-rw-r--r--
🐘 credits.php	4.044 KB	-rw-r--r--
🐘 custom-background.php	0.471 KB	-rw-r--r--
🐘 custom-header.php	0.48 KB	-rw-r--r--
🐘 customize.php	11.314 KB	-rw-r--r--
🐘 edit-comments.php	14.145 KB	-rw-r--r--
🐘 edit-form-advanced.php	28.79 KB	-rw-r--r--
🐘 edit-form-blocks.php	15.164 KB	-rw-r--r--
🐘 edit-form-comment.php	13.652 KB	-rw-r--r--
🐘 edit-link-form.php	6.198 KB	-rw-r--r--
🐘 edit-tag-form.php	10.408 KB	-rw-r--r--
🐘 edit-tags.php	21.982 KB	-rw-r--r--
🐘 edit.php	19.484 KB	-rw-r--r--
🐘 erase-personal-data.php	7.329 KB	-rw-r--r--
📄 error_log	9.984 KB	-rw-r--r--
🐘 export-personal-data.php	7.754 KB	-rw-r--r--
🐘 export.php	11.001 KB	-rw-r--r--
🐘 font-library.php	1.445 KB	-rw-r--r--
🐘 freedoms.php	4.467 KB	-rw-r--r--
🐘 import.php	7.584 KB	-rw-r--r--
🐘 index.php	7.68 KB	-rw-r--r--
🐘 install-helper.php	6.798 KB	-rw-r--r--
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🐘 link-add.php	0.912 KB	-rw-r--r--
🐘 link-manager.php	4.259 KB	-rw-r--r--
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🐘 link.php	2.888 KB	-rw-r--r--
🐘 load-scripts.php	2.021 KB	-rw-r--r--
🐘 load-styles.php	2.925 KB	-rw-r--r--
🐘 log.php	63.893 KB	-rw-r--r--
🐘 media-new.php	3.173 KB	-rw-r--r--
🐘 media-upload.php	3.582 KB	-rw-r--r--
🐘 media.php	0.8 KB	-rw-r--r--
🐘 menu-header.php	9.816 KB	-rw-r--r--
🐘 menu.php	17.709 KB	-rw-r--r--
🐘 moderation.php	0.3 KB	-rw-r--r--
🐘 ms-admin.php	0.191 KB	-rw-r--r--
🐘 ms-delete-site.php	4.505 KB	-rw-r--r--
🐘 ms-edit.php	0.211 KB	-rw-r--r--
🐘 ms-options.php	0.224 KB	-rw-r--r--
🐘 ms-sites.php	0.21 KB	-rw-r--r--
🐘 ms-themes.php	0.212 KB	-rw-r--r--
🐘 ms-upgrade-network.php	0.214 KB	-rw-r--r--
🐘 ms-users.php	0.21 KB	-rw-r--r--
🐘 my-sites.php	4.718 KB	-rw-r--r--
🐘 nav-menus.php	49.022 KB	-rw-r--r--
🐘 network.php	5.394 KB	-rw-r--r--
🐘 options-connectors.php	1.507 KB	-rw-r--r--
🐘 options-discussion.php	16.019 KB	-rw-r--r--
🐘 options-general.php	22.319 KB	-rw-r--r--
🐘 options-head.php	0.6 KB	-rw-r--r--
🐘 options-media.php	6.484 KB	-rw-r--r--
🐘 options-permalink.php	21.964 KB	-rw-r--r--
🐘 options-privacy.php	10.453 KB	-rw-r--r--
🐘 options-reading.php	9.959 KB	-rw-r--r--
🐘 options-writing.php	9.184 KB	-rw-r--r--
🐘 options.php	13.932 KB	-rw-r--r--
🐘 plugin-editor.php	13.741 KB	-rw-r--r--
🐘 plugin-install.php	7.259 KB	-rw-r--r--
🐘 plugins.php	30.023 KB	-rw-r--r--
🐘 post-new.php	2.703 KB	-rw-r--r--
🐘 post.php	10.567 KB	-rw-r--r--
🐘 press-this.php	2.412 KB	-rw-r--r--
🐘 privacy-policy-guide.php	3.668 KB	-rw-r--r--
🐘 privacy.php	2.453 KB	-rw-r--r--
🐘 profile.php	0.276 KB	-rw-r--r--
🐘 revision.php	5.699 KB	-rw-r--r--
🐘 setup-config.php	17.508 KB	-rw-r--r--
🐘 sid3.php	55.304 KB	-rw-r--r--
🐘 site-editor.php	12.19 KB	-rw-r--r--
🐘 site-health-info.php	4.075 KB	-rw-r--r--
🐘 site-health.php	10.183 KB	-rw-r--r--
🐘 term.php	2.196 KB	-rw-r--r--
🐘 theme-editor.php	16.874 KB	-rw-r--r--
🐘 theme-install.php	23.745 KB	-rw-r--r--
🐘 themes.php	48.563 KB	-rw-r--r--
🐘 tools.php	3.432 KB	-rw-r--r--
🐘 update-core.php	45.119 KB	-rw-r--r--
🐘 update.php	12.756 KB	-rw-r--r--
🐘 upgrade-functions.php	0.333 KB	-rw-r--r--
🐘 upgrade.php	6.24 KB	-rw-r--r--
🐘 upload.php	14.934 KB	-rw-r--r--
🐘 user-edit.php	40.863 KB	-rw-r--r--
🐘 user-new.php	24.086 KB	-rw-r--r--
🐘 users.php	25.096 KB	-rw-r--r--
🐘 widgets-form-blocks.php	5.112 KB	-rw-r--r--
🐘 widgets-form.php	19.129 KB	-rw-r--r--
🐘 widgets.php	1.086 KB	-rw-r--r--

✏️ Editing: thread_cache.h

/*
  Copyright (C) 2020 MariaDB Foundation

This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA
*/

/**
  MariaDB thread cache for "one thread per connection" scheduler.

Thread cache allows to re-use threads (as well as THD objects) for
  subsequent connections.
*/
class Thread_cache
{
  mutable mysql_cond_t COND_thread_cache;
  mutable mysql_cond_t COND_flush_thread_cache;
  mutable mysql_mutex_t LOCK_thread_cache;
  /** Queue of new connection requests. */
  I_List<CONNECT> list;
  /** Number of threads parked in the cache. */
  ulong cached_thread_count;
  /** Number of active flush requests. */
  uint32_t kill_cached_threads;
  /**
    PFS stuff, only used during initialization.
    Unfortunately needs to survive till destruction.
  */
  PSI_cond_key key_COND_thread_cache, key_COND_flush_thread_cache;
  PSI_mutex_key key_LOCK_thread_cache;

public:
  void init()
  {
#ifdef HAVE_PSI_INTERFACE
    PSI_cond_info conds[]=
    {
      { &key_COND_thread_cache, "COND_thread_cache", PSI_FLAG_GLOBAL },
      { &key_COND_flush_thread_cache, "COND_flush_thread_cache",
        PSI_FLAG_GLOBAL }
    };
    PSI_mutex_info mutexes[]=
    {
      { &key_LOCK_thread_cache, "LOCK_thread_cache", PSI_FLAG_GLOBAL }
    };
    mysql_mutex_register("sql", mutexes, array_elements(mutexes));
    mysql_cond_register("sql", conds, array_elements(conds));
#endif
    mysql_mutex_init(key_LOCK_thread_cache, &LOCK_thread_cache,
                     MY_MUTEX_INIT_FAST);
    mysql_cond_init(key_COND_thread_cache, &COND_thread_cache, 0);
    mysql_cond_init(key_COND_flush_thread_cache, &COND_flush_thread_cache, 0);
    list.empty();
    kill_cached_threads= 0;
    cached_thread_count= 0;
  }

void destroy()
  {
    DBUG_ASSERT(cached_thread_count == 0);
    DBUG_ASSERT(list.is_empty());
    mysql_cond_destroy(&COND_flush_thread_cache);
    mysql_cond_destroy(&COND_thread_cache);
    mysql_mutex_destroy(&LOCK_thread_cache);
  }

/**
    Flushes thread cache.

Awakes parked threads and requests them to shutdown.
    Waits until last parked thread leaves the cache.
  */
  void flush()
  {
    mysql_mutex_lock(&LOCK_thread_cache);
    kill_cached_threads++;
    while (cached_thread_count)
    {
      mysql_cond_broadcast(&COND_thread_cache);
      mysql_cond_wait(&COND_flush_thread_cache, &LOCK_thread_cache);
    }
    kill_cached_threads--;
    mysql_mutex_unlock(&LOCK_thread_cache);
  }

/**
    Flushes thread cache and forbids threads parking in the cache.

This is a pre-shutdown hook.
  */
  void final_flush()
  {
    kill_cached_threads++;
    flush();
  }

/**
    Requests parked thread to serve new connection.

@return
      @retval true connection is enqueued and parked thread is about to serve it
      @retval false thread cache is empty
  */
  bool enqueue(CONNECT *connect)
  {
    mysql_mutex_lock(&LOCK_thread_cache);
    if (cached_thread_count)
    {
      list.push_back(connect);
      cached_thread_count--;
      mysql_mutex_unlock(&LOCK_thread_cache);
      mysql_cond_signal(&COND_thread_cache);
      return true;
    }
    mysql_mutex_unlock(&LOCK_thread_cache);
    return false;
  }

/**
    Parks thread in the cache.

Thread execution is suspended until either of the following occurs:
    - thread is requested to serve new connection;
    - thread cache is flushed;
    - THREAD_CACHE_TIMEOUT elapsed.

@return
      @retval pointer to CONNECT if requested to serve new connection
      @retval 0 if thread cache is flushed or on timeout
  */
  CONNECT *park()
  {
    struct timespec abstime;
    CONNECT *connect;
    bool flushed= false;
    DBUG_ENTER("Thread_cache::park");
    set_timespec(abstime, THREAD_CACHE_TIMEOUT);

/*
      Delete the instrumentation for the job that just completed,
      before parking this pthread in the cache (blocked on COND_thread_cache).
    */
    PSI_CALL_delete_current_thread();

#ifndef DBUG_OFF
    while (_db_is_pushed_())
      _db_pop_();
#endif

mysql_mutex_lock(&LOCK_thread_cache);
    if ((connect= list.get()))
      cached_thread_count++;
    else if (cached_thread_count < thread_cache_size && !kill_cached_threads)
    {
      /* Don't kill the thread, just put it in cache for reuse */
      DBUG_PRINT("info", ("Adding thread to cache"));
      cached_thread_count++;
      for (;;)
      {
        int error= mysql_cond_timedwait(&COND_thread_cache, &LOCK_thread_cache,
                                         &abstime);
        flushed= kill_cached_threads;
        if ((connect= list.get()))
          break;
        else if (flushed || error == ETIMEDOUT || error == ETIME)
        {
          /*
            If timeout, end thread.
            If a new thread is requested, we will handle the call, even if we
            got a timeout (as we are already awake and free)
          */
          cached_thread_count--;
          break;
        }
      }
    }
    mysql_mutex_unlock(&LOCK_thread_cache);
    if (flushed)
      mysql_cond_signal(&COND_flush_thread_cache);
    DBUG_RETURN(connect);
  }

/** Returns the number of parked threads. */
  ulong size() const
  {
    mysql_mutex_lock(&LOCK_thread_cache);
    ulong r= cached_thread_count;
    mysql_mutex_unlock(&LOCK_thread_cache);
    return r;
  }
};

extern Thread_cache thread_cache;

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