FreeBSD/Linux Kernel Cross Reference
sys/dev/isci/scil/sci_base_subject.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
      *
      * This file is provided under a dual BSD/GPLv2 license.  When using or
      * redistributing this file, you may do so under either license.
      *
      * GPL LICENSE SUMMARY
      *
      * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
     *
     * This program is free software; you can redistribute it and/or modify
     * it under the terms of version 2 of the GNU General Public License as
     * published by the Free Software Foundation.
     *
     * 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 02110-1301 USA.
     * The full GNU General Public License is included in this distribution
     * in the file called LICENSE.GPL.
     *
     * BSD LICENSE
     *
     * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *   * Redistributions in binary form must reproduce the above copyright
     *     notice, this list of conditions and the following disclaimer in
     *     the documentation and/or other materials provided with the
     *     distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    /**
     * @file
     *
     * @brief This file contains the base subject method implementations and
     *        any constants or structures private to the base subject object.
     *        A subject is a participant in the observer design pattern.  A
     *        subject represents the object being observed.
     */
    
    #include <dev/isci/scil/sci_types.h>
    #include <dev/isci/scil/sci_base_subject.h>
    #include <dev/isci/scil/sci_base_observer.h>
    
    #if defined(SCI_LOGGING)
    
    //******************************************************************************
    //* P R O T E C T E D    M E T H O D S
    //******************************************************************************
    
    void sci_base_subject_construct(
       SCI_BASE_SUBJECT_T *this_subject
    )
    {
       this_subject->observer_list = NULL;
    }
    
    // ---------------------------------------------------------------------------
    
    void sci_base_subject_notify(
       SCI_BASE_SUBJECT_T *this_subject
    )
    {
       SCI_BASE_OBSERVER_T *this_observer = this_subject->observer_list;
    
       while (this_observer != NULL)
       {
          sci_base_observer_update(this_observer, this_subject);
    
          this_observer = this_observer->next;
       }
    }
    
   // ---------------------------------------------------------------------------
   
   void sci_base_subject_attach_observer(
      SCI_BASE_SUBJECT_T   *this_subject,
      SCI_BASE_OBSERVER_T  *observer
   )
   {
      observer->next = this_subject->observer_list;
   
      this_subject->observer_list = observer;
   }
   
   // ---------------------------------------------------------------------------
   
   void sci_base_subject_detach_observer(
      SCI_BASE_SUBJECT_T   *this_subject,
      SCI_BASE_OBSERVER_T  *observer
   )
   {
      SCI_BASE_OBSERVER_T *current_observer = this_subject->observer_list;
      SCI_BASE_OBSERVER_T *previous_observer = NULL;
   
      // Search list for the item to remove
      while (
                 current_observer != NULL
              && current_observer != observer
            )
      {
         previous_observer = current_observer;
         current_observer = current_observer->next;
      }
   
      // Was this observer in the list?
      if (current_observer == observer)
      {
         if (previous_observer != NULL)
         {
            // Remove from middle or end of list
            previous_observer->next = observer->next;
         }
         else
         {
            // Remove from the front of the list
            this_subject->observer_list = observer->next;
         }
   
         // protect the list so people dont follow bad pointers
         observer->next = NULL;
      }
   }
   
   #endif // defined(SCI_LOGGING)

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