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+/**
+ * @file
+ *
+ * @ingroup ScoreChain
+ *
+ * @brief Chain Handler API.
+ */
+
+/*
+ * Copyright (c) 2010 embedded brains GmbH.
+ *
+ * COPYRIGHT (c) 1989-2006.
+ * On-Line Applications Research Corporation (OAR).
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ *
+ * $Id$
+ */
+
+#ifndef _RTEMS_SCORE_CHAIN_H
+# error "Never use <rtems/score/chain.inl> directly; include <rtems/score/chain.h> instead."
+#endif
+
+#ifndef _RTEMS_SCORE_CHAIN_INL
+#define _RTEMS_SCORE_CHAIN_INL
+
+/**
+ * @addtogroup ScoreChain
+ * @{
+ */
+
+/** @brief Set off chain
+ *
+ * This function sets the next and previous fields of the @a node to NULL
+ * indicating the @a node is not part of a chain.
+ *
+ * @param[in] node the node set to off chain.
+ */
+RTEMS_INLINE_ROUTINE void _Chain_Set_off_chain(
+ Chain_Node *node
+)
+{
+ node->next = node->previous = NULL;
+}
+
+/** @brief Is the Node off Chain
+ *
+ * This function returns true if the @a node is not on a chain. A @a node is
+ * off chain if the next and previous fields are set to NULL.
+ *
+ * @param[in] node is the node off chain.
+ *
+ * @return This function returns true if the @a node is off chain.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Is_node_off_chain(
+ const Chain_Node *node
+)
+{
+ return (node->next == NULL) && (node->previous == NULL);
+}
+
+/** @brief Are Two Nodes Equal
+ *
+ * This function returns true if @a left and @a right are equal,
+ * and false otherwise.
+ *
+ * @param[in] left is the node on the left hand side of the comparison.
+ * @param[in] right is the node on the left hand side of the comparison.
+ *
+ * @return This function returns true if @a left and @a right are equal,
+ * and false otherwise.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Are_nodes_equal(
+ const Chain_Node *left,
+ const Chain_Node *right
+)
+{
+ return left == right;
+}
+
+/** @brief Is this Chain Control Pointer Null
+ *
+ * This function returns true if the_chain is NULL and false otherwise.
+ *
+ * @param[in] the_chain is the chain to be checked for empty status.
+ *
+ * @return This method returns true if the_chain is NULL and false otherwise.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Is_null(
+ const Chain_Control *the_chain
+)
+{
+ return (the_chain == NULL);
+}
+
+/** @brief Is the Chain Node Pointer NULL
+ *
+ * This function returns true if the_node is NULL and false otherwise.
+ *
+ * @param[in] the_node is the node pointer to check.
+ *
+ * @return This method returns true if the_node is NULL and false otherwise.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Is_null_node(
+ const Chain_Node *the_node
+)
+{
+ return (the_node == NULL);
+}
+
+/** @brief Return pointer to Chain Head
+ *
+ * This function returns a pointer to the head node on the chain.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ *
+ * @return This method returns the permanent head node of the chain.
+ */
+RTEMS_INLINE_ROUTINE Chain_Node *_Chain_Head(
+ Chain_Control *the_chain
+)
+{
+ return &the_chain->Head.Node;
+}
+
+/** @brief Return pointer to immutable Chain Head
+ *
+ * This function returns a pointer to the head node on the chain.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ *
+ * @return This method returns the permanent head node of the chain.
+ */
+RTEMS_INLINE_ROUTINE const Chain_Node *_Chain_Immutable_head(
+ const Chain_Control *the_chain
+)
+{
+ return &the_chain->Head.Node;
+}
+
+/** @brief Return pointer to Chain Tail
+ *
+ * This function returns a pointer to the last node on the chain.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ *
+ * @return This method returns the permanent tail node of the chain.
+ */
+RTEMS_INLINE_ROUTINE Chain_Node *_Chain_Tail(
+ Chain_Control *the_chain
+)
+{
+ return &the_chain->Tail.Node;
+}
+
+/** @brief Return pointer to immutable Chain Tail
+ *
+ * This function returns a pointer to the last node on the chain.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ *
+ * @return This method returns the permanent tail node of the chain.
+ */
+RTEMS_INLINE_ROUTINE const Chain_Node *_Chain_Immutable_tail(
+ const Chain_Control *the_chain
+)
+{
+ return &the_chain->Tail.Node;
+}
+
+/** @brief Return pointer to Chain's First node
+ *
+ * This function returns a pointer to the first node on the chain after the
+ * head.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ *
+ * @return This method returns the first node of the chain.
+ */
+RTEMS_INLINE_ROUTINE Chain_Node *_Chain_First(
+ Chain_Control *the_chain
+)
+{
+ return _Chain_Head( the_chain )->next;
+}
+
+/** @brief Return pointer to immutable Chain's First node
+ *
+ * This function returns a pointer to the first node on the chain after the
+ * head.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ *
+ * @return This method returns the first node of the chain.
+ */
+RTEMS_INLINE_ROUTINE const Chain_Node *_Chain_Immutable_first(
+ const Chain_Control *the_chain
+)
+{
+ return _Chain_Immutable_head( the_chain )->next;
+}
+
+/** @brief Return pointer to Chain's Last node
+ *
+ * This function returns a pointer to the last node on the chain just before
+ * the tail.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ *
+ * @return This method returns the last node of the chain.
+ */
+RTEMS_INLINE_ROUTINE Chain_Node *_Chain_Last(
+ Chain_Control *the_chain
+)
+{
+ return _Chain_Tail( the_chain )->previous;
+}
+
+/** @brief Return pointer to immutable Chain's Last node
+ *
+ * This function returns a pointer to the last node on the chain just before
+ * the tail.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ *
+ * @return This method returns the last node of the chain.
+ */
+RTEMS_INLINE_ROUTINE const Chain_Node *_Chain_Immutable_last(
+ const Chain_Control *the_chain
+)
+{
+ return _Chain_Immutable_tail( the_chain )->previous;
+}
+
+/** @brief Return pointer the next node from this node
+ *
+ * This function returns a pointer to the next node after this node.
+ *
+ * @param[in] the_node is the node to be operated upon.
+ *
+ * @return This method returns the next node on the chain.
+ */
+RTEMS_INLINE_ROUTINE Chain_Node *_Chain_Next(
+ Chain_Node *the_node
+)
+{
+ return the_node->next;
+}
+
+/** @brief Return pointer the previous node from this node
+ *
+ * This function returns a pointer to the previous node on this chain.
+ *
+ * @param[in] the_node is the node to be operated upon.
+ *
+ * @return This method returns the previous node on the chain.
+ */
+RTEMS_INLINE_ROUTINE Chain_Node *_Chain_Previous(
+ Chain_Node *the_node
+)
+{
+ return the_node->previous;
+}
+
+/** @brief Is the Chain Empty
+ *
+ * This function returns true if there a no nodes on @a the_chain and
+ * false otherwise.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ *
+ * @return This function returns true if there a no nodes on @a the_chain and
+ * false otherwise.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Is_empty(
+ const Chain_Control *the_chain
+)
+{
+ return _Chain_Immutable_first( the_chain )
+ == _Chain_Immutable_tail( the_chain );
+}
+
+/** @brief Is this the First Node on the Chain
+ *
+ * This function returns true if the_node is the first node on a chain and
+ * false otherwise.
+ *
+ * @param[in] the_node is the node the caller wants to know if it is
+ * the first node on a chain.
+ *
+ * @return This function returns true if @a the_node is the first node on
+ * a chain and false otherwise.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Is_first(
+ const Chain_Node *the_node
+)
+{
+ return (the_node->previous == NULL);
+}
+
+/** @brief Is this the Last Node on the Chain
+ *
+ * This function returns true if @a the_node is the last node on a chain and
+ * false otherwise.
+ *
+ * @param[in] the_node is the node to check as the last node.
+ *
+ * @return This function returns true if @a the_node is the last node on
+ * a chain and false otherwise.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Is_last(
+ const Chain_Node *the_node
+)
+{
+ return (the_node->next == NULL);
+}
+
+/** @brief Does this Chain have only One Node
+ *
+ * This function returns true if there is only one node on @a the_chain and
+ * false otherwise.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ *
+ * @return This function returns true if there is only one node on
+ * @a the_chain and false otherwise.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Has_only_one_node(
+ const Chain_Control *the_chain
+)
+{
+ return _Chain_Immutable_first( the_chain )
+ == _Chain_Immutable_last( the_chain );
+}
+
+/** @brief Is this Node the Chain Head
+ *
+ * This function returns true if @a the_node is the head of the_chain and
+ * false otherwise.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ * @param[in] the_node is the node to check for being the Chain Head.
+ *
+ * @return This function returns true if @a the_node is the head of
+ * @a the_chain and false otherwise.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Is_head(
+ Chain_Control *the_chain,
+ const Chain_Node *the_node
+)
+{
+ return (the_node == _Chain_Head(the_chain));
+}
+
+/** @brief Is this Node the Chail Tail
+ *
+ * This function returns true if the_node is the tail of the_chain and
+ * false otherwise.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ * @param[in] the_node is the node to check for being the Chain Tail.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Is_tail(
+ Chain_Control *the_chain,
+ const Chain_Node *the_node
+)
+{
+ return (the_node == _Chain_Tail(the_chain));
+}
+
+/** @brief Initialize this Chain as Empty
+ *
+ * This routine initializes the specified chain to contain zero nodes.
+ *
+ * @param[in] the_chain is the chain to be initialized.
+ */
+RTEMS_INLINE_ROUTINE void _Chain_Initialize_empty(
+ Chain_Control *the_chain
+)
+{
+ Chain_Node *head = _Chain_Head( the_chain );
+ Chain_Node *tail = _Chain_Tail( the_chain );
+
+ head->next = tail;
+ head->previous = NULL;
+ tail->previous = head;
+}
+
+/** @brief Extract this Node (unprotected)
+ *
+ * This routine extracts the_node from the chain on which it resides.
+ * It does NOT disable interrupts to ensure the atomicity of the
+ * extract operation.
+ *
+ * @param[in] the_node is the node to be extracted.
+ */
+RTEMS_INLINE_ROUTINE void _Chain_Extract_unprotected(
+ Chain_Node *the_node
+)
+{
+ Chain_Node *next;
+ Chain_Node *previous;
+
+ next = the_node->next;
+ previous = the_node->previous;
+ next->previous = previous;
+ previous->next = next;
+}
+
+/** @brief Get the First Node (unprotected)
+ *
+ * This function removes the first node from the_chain and returns
+ * a pointer to that node. It does NOT disable interrupts to ensure
+ * the atomicity of the get operation.
+ *
+ * @param[in] the_chain is the chain to attempt to get the first node from.
+ *
+ * @return This method returns the first node on the chain even if it is
+ * the Chain Tail.
+ *
+ * @note This routine assumes that there is at least one node on the chain
+ * and always returns a node even if it is the Chain Tail.
+ */
+RTEMS_INLINE_ROUTINE Chain_Node *_Chain_Get_first_unprotected(
+ Chain_Control *the_chain
+)
+{
+ Chain_Node *head = _Chain_Head( the_chain );
+ Chain_Node *old_first = head->next;
+ Chain_Node *new_first = old_first->next;
+
+ head->next = new_first;
+ new_first->previous = head;
+
+ return old_first;
+}
+
+/** @brief Get the First Node (unprotected)
+ *
+ * This function removes the first node from the_chain and returns
+ * a pointer to that node. If the_chain is empty, then NULL is returned.
+ *
+ * @param[in] the_chain is the chain to attempt to get the first node from.
+ *
+ * @return This method returns the first node on the chain or NULL if the
+ * chain is empty.
+ *
+ * @note It does NOT disable interrupts to ensure the atomicity of the
+ * get operation.
+ */
+RTEMS_INLINE_ROUTINE Chain_Node *_Chain_Get_unprotected(
+ Chain_Control *the_chain
+)
+{
+ if ( !_Chain_Is_empty(the_chain))
+ return _Chain_Get_first_unprotected(the_chain);
+ else
+ return NULL;
+}
+
+/** @brief Insert a Node (unprotected)
+ *
+ * This routine inserts the_node on a chain immediately following
+ * after_node.
+ *
+ * @param[in] after_node is the node which will precede @a the_node on the
+ * chain.
+ * @param[in] the_node is the node to be inserted.
+ *
+ * @note It does NOT disable interrupts to ensure the atomicity
+ * of the extract operation.
+ */
+RTEMS_INLINE_ROUTINE void _Chain_Insert_unprotected(
+ Chain_Node *after_node,
+ Chain_Node *the_node
+)
+{
+ Chain_Node *before_node;
+
+ the_node->previous = after_node;
+ before_node = after_node->next;
+ after_node->next = the_node;
+ the_node->next = before_node;
+ before_node->previous = the_node;
+}
+
+/** @brief Append a Node (unprotected)
+ *
+ * This routine appends the_node onto the end of the_chain.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ * @param[in] the_node is the node to be appended.
+ *
+ * @note It does NOT disable interrupts to ensure the atomicity of the
+ * append operation.
+ */
+RTEMS_INLINE_ROUTINE void _Chain_Append_unprotected(
+ Chain_Control *the_chain,
+ Chain_Node *the_node
+)
+{
+ Chain_Node *tail = _Chain_Tail( the_chain );
+ Chain_Node *old_last = tail->previous;
+
+ the_node->next = tail;
+ tail->previous = the_node;
+ old_last->next = the_node;
+ the_node->previous = old_last;
+}
+
+/** @brief Prepend a Node (unprotected)
+ *
+ * This routine prepends the_node onto the front of the_chain.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ * @param[in] the_node is the node to be prepended.
+ *
+ * @note It does NOT disable interrupts to ensure the atomicity of the
+ * prepend operation.
+ */
+RTEMS_INLINE_ROUTINE void _Chain_Prepend_unprotected(
+ Chain_Control *the_chain,
+ Chain_Node *the_node
+)
+{
+ _Chain_Insert_unprotected(_Chain_Head(the_chain), the_node);
+}
+
+/** @brief Prepend a Node (protected)
+ *
+ * This routine prepends the_node onto the front of the_chain.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ * @param[in] the_node is the node to be prepended.
+ *
+ * @note It disables interrupts to ensure the atomicity of the
+ * prepend operation.
+ */
+RTEMS_INLINE_ROUTINE void _Chain_Prepend(
+ Chain_Control *the_chain,
+ Chain_Node *the_node
+)
+{
+ _Chain_Insert(_Chain_Head(the_chain), the_node);
+}
+
+/**
+ * @brief Append a node and check if the chain was empty before (unprotected).
+ *
+ * This routine appends the_node onto the end of the_chain.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ * @param[in] the_node is the node to be appended.
+ *
+ * @note It does NOT disable interrupts to ensure the atomicity of the
+ * append operation.
+ *
+ * @retval true The chain was empty before.
+ * @retval false The chain contained at least one node before.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Append_with_empty_check_unprotected(
+ Chain_Control *the_chain,
+ Chain_Node *the_node
+)
+{
+ bool was_empty = _Chain_Is_empty( the_chain );
+
+ _Chain_Append_unprotected( the_chain, the_node );
+
+ return was_empty;
+}
+
+/**
+ * @brief Prepend a node and check if the chain was empty before (unprotected).
+ *
+ * This routine prepends the_node onto the front of the_chain.
+ *
+ * @param[in] the_chain is the chain to be operated upon.
+ * @param[in] the_node is the node to be prepended.
+ *
+ * @note It does NOT disable interrupts to ensure the atomicity of the
+ * prepend operation.
+ *
+ * @retval true The chain was empty before.
+ * @retval false The chain contained at least one node before.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Prepend_with_empty_check_unprotected(
+ Chain_Control *the_chain,
+ Chain_Node *the_node
+)
+{
+ bool was_empty = _Chain_Is_empty( the_chain );
+
+ _Chain_Prepend_unprotected( the_chain, the_node );
+
+ return was_empty;
+}
+
+/**
+ * @brief Get the first node and check if the chain is empty afterwards
+ * (unprotected).
+ *
+ * This function removes the first node from the_chain and returns
+ * a pointer to that node in @a the_node. If the_chain is empty, then NULL is
+ * returned.
+ *
+ * @param[in] the_chain is the chain to attempt to get the first node from.
+ * @param[out] the_node is the first node on the chain or NULL if the chain is
+ * empty.
+ *
+ * @note It does NOT disable interrupts to ensure the atomicity of the
+ * get operation.
+ *
+ * @retval true The chain is empty now.
+ * @retval false The chain contains at least one node now.
+ */
+RTEMS_INLINE_ROUTINE bool _Chain_Get_with_empty_check_unprotected(
+ Chain_Control *the_chain,
+ Chain_Node **the_node
+)
+{
+ bool is_empty_now = true;
+ Chain_Node *head = _Chain_Head( the_chain );
+ Chain_Node *tail = _Chain_Tail( the_chain );
+ Chain_Node *old_first = head->next;
+
+ if ( old_first != tail ) {
+ Chain_Node *new_first = old_first->next;
+
+ head->next = new_first;
+ new_first->previous = head;
+
+ *the_node = old_first;
+
+ is_empty_now = new_first == tail;
+ } else
+ *the_node = NULL;
+
+ return is_empty_now;
+}
+
+/**@}*/
+
+#endif
+/* end of include file */