1 files changed, 149 insertions, 0 deletions
diff --git a/sys/dev/isci/scil/sci_base_subject.c b/sys/dev/isci/scil/sci_base_subject.c
new file mode 100644
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--- /dev/null
+++ b/sys/dev/isci/scil/sci_base_subject.c
@@ -0,0 +1,149 @@
+/*-
+ * 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)