diff options
Diffstat (limited to 'doc/info')
| -rw-r--r-- | doc/info/mds.texinfo | 326 |
1 files changed, 155 insertions, 171 deletions
diff --git a/doc/info/mds.texinfo b/doc/info/mds.texinfo index 01fb223..ab043e6 100644 --- a/doc/info/mds.texinfo +++ b/doc/info/mds.texinfo @@ -1160,8 +1160,8 @@ client ID:s. @item @code{linked_list_t} @{also known as @code{struct linked_list}@} In the header file @file{<libmdsserver/linked-list.h>}, -libmdsserver defines a double linked linear -sentinel-array-linked list. +libmdsserver defines a linear array sentinel doubly +linked list. @item @code{hash_table_t} @{also known as @code{struct hash_table}@} In the header file @file{<libmdsserver/hash-table.h>}, @@ -1224,11 +1224,13 @@ However, @code{hash_table_unmarshal} and @end table @menu -* Client List:: The @code{client_list_t} data structure.. +* Client List:: The @code{client_list_t} data structure. +* Linked List:: The @code{linked_list_t} data structure. @end menu +@page @node Client List @subsection Client List @@ -1279,193 +1281,175 @@ void print_elements(client_list_t* this) +@node Linked List +@subsection Linked List +@code{linked_list_t} is a linear array sentinel +doubly linked list. This means that is implemented +using arrays rather than node references. More +specifically, since it is doubly linked@footnote{And +not using XOR-linking.}, it is implemented using +three arrays: -@node GNU Free Documentation License -@appendix GNU Free Documentation License -@include fdl.texinfo +@table @code +@item size_t* values +The value stored in each node. + +@item ssize_t* next +The next node for each node, @code{edge} if the current +node is the last node, and @code{LINKED_LIST_UNUSED} if +there is no node on this position. + +@item ssize_t* previous +The previous node for each node, @code{edge} if the current +node is the first node, and @code{LINKED_LIST_UNUSED} if +there is no node on this position. +@end table -@bye +The linked list has a sentinel node that joins +boths ends of the list. The index of this node +is stored in the variable @code{edge}. +Because the list is implemented using arrays, if the +number of elements in it shinks considerably, it will +not be able to automatically free unused space. Instead +you must call @code{linked_list_pack}: - /** - * The size of the arrays - */ - size_t capacity; - - /** - * The index after the last used index in - * `values` and `next` - */ - size_t end; - - /** - * Head of the stack of reusable positions - */ - size_t reuse_head; - - /** - * Stack of indices than are no longer in use - */ - ssize_t* reusable; - - /** - * The value stored in each node - */ - size_t* values; - - /** - * The next node for each node, `edge` if the current - * node is the last node, and `LINKED_LIST_UNUSED` - * if there is no node on this position - */ - ssize_t* next; - - /** - * The previous node for each node, `edge` if - * the current node is the first node, and - * `LINKED_LIST_UNUSED` if there is no node - * on this position - */ - ssize_t* previous; - - /** - * The sentinel node in the list - */ - ssize_t edge; - -/** - * Create a linked list - * - * @param this Memory slot in which to store the new linked list - * @param capacity The minimum initial capacity of the linked list, 0 for default - * @return Non-zero on error, `errno` will have been set accordingly - */ -int linked_list_create(linked_list_t* restrict this, size_t capacity); +@table @asis +@item @code{linked_list_pack} [(@code{linked_list_t* restrict this}) @arrow{} @code{int}] +Pack the list so that there are no reusable positions, +and reduce the capacity to the smallest capacity that +can be used. Note that values (nodes) returned by the +list's methods will become invalid. Additionally (to +reduce the complexity) the list will be defragment so +that the nodes' indices are continuous. This method has +linear time complexity and linear memory complexity. +@end table -/** - * Pack the list so that there are no reusable - * positions, and reduce the capacity to the - * smallest capacity that can be used. Not that - * values (nodes) returned by the list's methods - * will become invalid. Additionally (to reduce - * the complexity) the list will be defragment - * so that the nodes' indices are continuous. - * This method has linear time complexity and - * linear memory complexity. - * - * @param this The list - * @return Non-zero on error, `errno` will have been set accordingly - */ -int linked_list_pack(linked_list_t* restrict this); - -/** - * Insert a value in the beginning of the list - * - * @param this:linked_list_t* The list - * @param value:size_t The value to insert - * @return :ssize_t The node that has been created and inserted, - * `LINKED_LIST_UNUSED` on error, `errno` will be set accordingly - */ -#define linked_list_insert_beginning(this, value) \ - (linked_list_insert_after(this, value, this->edge)) +To create a linked list list, allocate a +@code{linked_list_t*} or otherwise obtain +a @code{linked_list_t*}, and call +@code{linked_list_create} with that +pointer as the first argument, and +the @code{0} as the second argument, +unless you want to tune the initialisation. +@code{linked_list_create} will return +zero on and only on successful initialisation. +@code{linked_list_create}'s second parameter +--- @code{size_t capacity} --- can be used +to specify how many element the list should +initially fit. It will grow when needed, but +it is a good idea to tell it how many elements +you are planning to populate it with. -/** - * Remove the node at the beginning of the list - * - * @param this:linked_list_t* The list - * @return :ssize_t The node that has been removed - */ -#define linked_list_remove_beginning(this) \ - (linked_list_remove_after(this, this->edge)) +There are five functions adding and removing +items to and from a linked list: -/** - * Insert a value after a specified, reference, node - * - * @param this The list - * @param value The value to insert - * @param predecessor The reference node - * @return The node that has been created and inserted, - * `LINKED_LIST_UNUSED` on error, `errno` will be set accordingly - */ -ssize_t linked_list_insert_after(linked_list_t* restrict this, size_t value, ssize_t predecessor); +@table @asis +@item @code{linked_list_insert_after} [(@code{this, size_t value, ssize_t predecessor}) @arrow{} @code{ssize_t}] +Create a new node with the value @code{value} and add it +to the list @code{*this} after the node @code{predecessor}. +On success, the new node is returned, on failure +@code{LINKED_LIST_UNUSED} is returned. + +@item @code{linked_list_insert_before} [(@code{this, size_t value, ssize_t successor}) @arrow{} @code{ssize_t}] +Create a new node with the value @code{value} and add it +to the list @code{*this} before the node @code{successor}. +On success, the new node is returned, on failure +@code{LINKED_LIST_UNUSED} is returned. + +@item @code{linked_list_remove_after} [(@code{this, ssize_t predecessor}) @arrow{} @code{ssize_t}] +Remove and return the node in the list @code{*this} +directly after the node @code{predecessor}. + +@item @code{linked_list_remove_before} [(@code{this, ssize_t successor}) @arrow{} @code{ssize_t}] +Remove and return the node in the list @code{*this} +directly before the node @code{predecessor}. + +@item @code{linked_list_remove} [(@code{this, ssize_t node}) @arrow{} @code{void}] +Remove the node @code{node} from the list @code{*this}. +@end table -/** - * Remove the node after a specified, reference, node - * - * @param this The list - * @param predecessor The reference node - * @return The node that has been removed - */ -ssize_t linked_list_remove_after(linked_list_t* restrict this, ssize_t predecessor); +The data type for @code{this} is @code{linked_list_t*} +with the @code{restrict} modifier for these and all +other @code{linked_list_t} functions. -/** - * Insert a value before a specified, reference, node - * - * @param this The list - * @param value The value to insert - * @param successor The reference node - * @return The node that has been created and inserted, - * `LINKED_LIST_UNUSED` on error, `errno` will be set accordingly - */ -ssize_t linked_list_insert_before(linked_list_t* restrict this, size_t value, ssize_t successor); +Note that if the node @code{this->edge} is removed, +the list become circularly linked and the sentinel +will become missing which renders invokation of all +macros undefined in behaviour. Further note that +removing the sentinel while it is the only node in +the list invokes undefined behaviour. Also note that +addressing non-existing nodes invokes undefined +behaviour. -/** - * Remove the node before a specified, reference, node - * - * @param this The list - * @param successor The reference node - * @return The node that has been removed - */ -ssize_t linked_list_remove_before(linked_list_t* restrict this, ssize_t successor); +@file{<libmdsserver/linked_list.h>} defines two +macros for inserting nodes at the edges of a linked +list and two macros for removing nodes from the +edges of a linked list: -/** - * Remove the node from the list - * - * @param this The list - * @param node The node to remove - */ -void linked_list_remove(linked_list_t* restrict this, ssize_t node); +@table @asis +@item @code{linked_list_insert_beginning} [(@code{linked_list_t* this, size_t value}) @arrow{} @code{ssize_t}] +Create a new node with the value @code{value} in +insert it to the beginning of the list @code{*this}. +On success, the new node is returned, on failure +@code{LINKED_LIST_UNUSED} is returned. + +@item @code{linked_list_insert_end} [(@code{linked_list_t* this, size_t value}) @arrow{} @code{ssize_t}] +Create a new node with the value @code{value} in +insert it to the end of the list @code{*this}. +On success, the new node is returned, on failure +@code{LINKED_LIST_UNUSED} is returned. + +@item @code{linked_list_remove_beginning} [(@code{linked_list_t* this}) @arrow{} @code{ssize_t}] +Remove and return the first node in the +list @code{*this}. + +@item @code{linked_list_remove_end} [(@code{linked_list_t* this}) @arrow{} @code{ssize_t}] +Remove and return the node node in the +list @code{*this}. +@end table -/** - * Insert a value in the end of the list - * - * @param this:linked_list_t* The list - * @param value:size_t The value to insert - * @return :ssize_t The node that has been created and inserted, - * `LINKED_LIST_UNUSED` on error, `errno` will be set accordingly - */ -#define linked_list_insert_end(this, value) \ - (linked_list_insert_before((this), (value), (this)->edge)) +Additionally the library defines a macro that +wrappes the @code{for} keyword to iterate over +all nodes (except the sentinel node) the a +linked list: -/** - * Remove the node at the end of the list - * - * @param this:linked_list_t* The list - * @return :ssize_t The node that has been removed - */ -#define linked_list_remove_end(this) \ - (linked_list_remove_before((this), (this)->edge)) +@table @asis +@item @code{foreach_linked_list_node} [(@code{linked_list_t this, ssize_t node})] +Wrapper for `for` keyword that iterates over each +element in the list @code{this}, and store the +current node to the variable named by the parameter +@code{node} for each iterations. -/** - * Wrapper for `for` keyword that iterates over each element in a linked list - * - * @param list:linked_list_t The linked list - * @param node:ssize_t The variable to store the node in at each iteration - */ -#define foreach_linked_list_node(list, node) \ - for (node = (list).edge; node = (list).next[node], node != (list).edge;) +@example +void print_linked_list_values(linked_list_t* list) +@{ + ssize_t node; + foreach_linked_list_node (*list, node) + printf("%zi\n", list->values[node]); +@} +@end example + +Note that the data type for @code{this} in the +macro is not a pointer. +@end table + +There is also a function intended for debugging: + +@table @asis +@item @code{linked_list_dump} [(@code{linked_list_t* restrict this, FILE* restrict output}) @arrow{} @code{void}] +The all internal data of the list @code{*this} +into the stream @code{output}. +@end table -/** - * Print the content of the list - * - * @param this The list - * @param output Output file - */ -void linked_list_dump(linked_list_t* restrict this, FILE* restrict output); +@node GNU Free Documentation License +@appendix GNU Free Documentation License +@include fdl.texinfo +@bye /** |