forked from Imagelibrary/rtems
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/* Linked list help functions used by driver manager.
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*
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* COPYRIGHT (c) 2009 Cobham Gaisler AB.
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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/*
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* Help functions for the Driver Manager. Implements a singly linked list
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* with head and tail pointers for fast insertions/deletions to head and
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* tail in list.
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*/
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#ifndef _DRVIVER_MANAGER_LIST_H_
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#define _DRVIVER_MANAGER_LIST_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*! List description, Singly link list with head and tail pointers. */
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struct drvmgr_list {
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void *head; /*!< First entry in queue */
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void *tail; /*!< Last entry in queue */
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int ofs; /*!< Offset into head and tail to find next field */
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};
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/* Static initialization of list */
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#define LIST_INITIALIZER(type, field) {NULL, NULL, offsetof(type, field)}
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/* Return the first element in list */
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#define LIST_HEAD(list, type) ((type *)(list)->head)
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/* Return the last element in list */
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#define LIST_TAIL(list, type) ((type *)(list)->tail)
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/* Get the next pointer of an entry */
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#define LIST_FIELD(list, entry) (*(void **)((char *)(entry) + (list)->ofs))
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/* Return the next emlement in list */
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#define LIST_NEXT(list, entry, type) ((type *)(LIST_FIELD(list, entry)))
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/* Iterate through all entries in list */
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#define LIST_FOR_EACH(list, entry, type) \
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for (entry = LIST_HEAD(list, type); \
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entry; \
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entry = LIST_NEXT(list, entry, type))
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/*! Initialize a list during runtime
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*
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* \param list The list to initialize
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* \param offset The number of bytes into the entry structure the next pointer
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* is found
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*/
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extern void drvmgr_list_init(struct drvmgr_list *list, int offset);
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/*! Clear list */
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extern void drvmgr_list_empty(struct drvmgr_list *list);
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/*! Add entry to front of list */
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extern void drvmgr_list_add_head(struct drvmgr_list *list, void *entry);
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/*! Add entry to end of list */
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extern void drvmgr_list_add_tail(struct drvmgr_list *list, void *entry);
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/*! Remove entry from front of list */
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extern void drvmgr_list_remove_head(struct drvmgr_list *list);
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/*! Remove entry from anywhere in list */
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extern void drvmgr_list_remove(struct drvmgr_list *list, void *entry);
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#ifdef __cplusplus
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}
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#endif
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#endif
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