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score: Use only next field for chain on/off

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It is sufficient to use one field for the chain on/off indication.  The
chain API functions are highly performance critical.
This commit is contained in:
Sebastian Huber
2014-03-14 13:55:00 +01:00
parent bc75887774
commit d6da1b1ef4
1 changed files with 6 additions and 6 deletions
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12
cpukit/score/include/rtems/score/chainimpl.h
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@@ -221,8 +221,8 @@ size_t _Chain_Node_count_unprotected( const Chain_Control *chain );
/** /**
* @brief Set off chain. * @brief Set off chain.
* *
* This function sets the next and previous fields of the @a node to NULL * This function sets the next field of the @a node to NULL indicating the @a
* indicating the @a node is not part of a chain. * node is not part of a chain.
* *
* @param[in] node the node set to off chain. * @param[in] node the node set to off chain.
*/ */
@@ -230,14 +230,14 @@ RTEMS_INLINE_ROUTINE void _Chain_Set_off_chain(
Chain_Node *node Chain_Node *node
) )
{ {
node->next = node->previous = NULL; node->next = NULL;
} }
/** /**
* @brief Is the node off chain. * @brief Is the node off chain.
* *
* This function returns true if the @a node is not on a chain. A @a node is * 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. * off chain if the next field is set to NULL.
* *
* @param[in] node is the node off chain. * @param[in] node is the node off chain.
* *
@@ -248,7 +248,7 @@ RTEMS_INLINE_ROUTINE bool _Chain_Is_node_off_chain(
const Chain_Node *node const Chain_Node *node
) )
{ {
return (node->next == NULL) && (node->previous == NULL); return node->next == NULL;
} }
/** /**