78 lines
3.2 KiB
C
78 lines
3.2 KiB
C
|
/* Copyright 2016 Google Inc.
|
||
|
|
|
||
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
you may not use this file except in compliance with the License.
|
||
|
|
You may obtain a copy of the License at
|
||
|
|
|
||
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
|
||
|
|
Unless required by applicable law or agreed to in writing, software
|
||
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
See the License for the specific language governing permissions and
|
||
|
|
limitations under the License. */
|
||
|
|
|
||
|
|
#ifndef NSYNC_INTERNAL_DLL_H_
|
||
|
|
#define NSYNC_INTERNAL_DLL_H_
|
||
|
|
|
||
|
|
/* Doubly linked lists. */
|
||
|
|
|
||
|
|
#include "nsync_cpp.h"
|
||
|
|
NSYNC_CPP_START_
|
||
|
|
|
||
|
|
/* A nsync_dll_element_ represents an element of a doubly-linked list of waiters. */
|
||
|
|
typedef struct nsync_dll_element_s_ {
|
||
|
|
struct nsync_dll_element_s_ *next;
|
||
|
|
struct nsync_dll_element_s_ *prev;
|
||
|
|
void *container; /* points to the struct this nsync_dll struct is embedded in. */
|
||
|
|
} nsync_dll_element_;
|
||
|
|
|
||
|
|
/* A nsync_dll_list_ represents a list of nsync_dll_elements_. */
|
||
|
|
typedef nsync_dll_element_ *nsync_dll_list_; /* last elem of circular list; nil => empty; first is x.next. */
|
||
|
|
|
||
|
|
|
||
|
|
/* Initialize *e. */
|
||
|
|
void nsync_dll_init_ (nsync_dll_element_ *e, void *container);
|
||
|
|
|
||
|
|
/* Return whether list is empty. */
|
||
|
|
int nsync_dll_is_empty_ (nsync_dll_list_ list);
|
||
|
|
|
||
|
|
/* Remove *e from list, and returns the new list. */
|
||
|
|
nsync_dll_list_ nsync_dll_remove_ (nsync_dll_list_ list, nsync_dll_element_ *e);
|
||
|
|
|
||
|
|
/* Cause element *n and its successors to come after element *p.
|
||
|
|
Requires n and p are non-NULL and do not point at elements of the same list. */
|
||
|
|
void nsync_dll_splice_after_ (nsync_dll_element_ *p, nsync_dll_element_ *n);
|
||
|
|
|
||
|
|
/* Make element *e the first element of list, and return
|
||
|
|
the list. The resulting list will have *e as its first element, followed by
|
||
|
|
any elements in the same list as *e, followed by the elements that were
|
||
|
|
previously in list. Requires that *e not be in list. If e==NULL, list is
|
||
|
|
returned unchanged. */
|
||
|
|
nsync_dll_list_ nsync_dll_make_first_in_list_ (nsync_dll_list_ list, nsync_dll_element_ *e);
|
||
|
|
|
||
|
|
/* Make element *e the last element of list, and return
|
||
|
|
the list. The resulting list will have *e as its last element, preceded by
|
||
|
|
any elements in the same list as *e, preceded by the elements that were
|
||
|
|
previously in list. Requires that *e not be in list. If e==NULL, list is
|
||
|
|
returned unchanged. */
|
||
|
|
nsync_dll_list_ nsync_dll_make_last_in_list_ (nsync_dll_list_ list, nsync_dll_element_ *e);
|
||
|
|
|
||
|
|
/* Return a pointer to the first element of list, or NULL if list is empty. */
|
||
|
|
nsync_dll_element_ *nsync_dll_first_ (nsync_dll_list_ list);
|
||
|
|
|
||
|
|
/* Return a pointer to the last element of list, or NULL if list is empty. */
|
||
|
|
nsync_dll_element_ *nsync_dll_last_ (nsync_dll_list_ list);
|
||
|
|
|
||
|
|
/* Return a pointer to the next element of list following *e,
|
||
|
|
or NULL if there is no such element. */
|
||
|
|
nsync_dll_element_ *nsync_dll_next_ (nsync_dll_list_ list, nsync_dll_element_ *e);
|
||
|
|
|
||
|
|
/* Return a pointer to the previous element of list following *e,
|
||
|
|
or NULL if there is no such element. */
|
||
|
|
nsync_dll_element_ *nsync_dll_prev_ (nsync_dll_list_ list, nsync_dll_element_ *e);
|
||
|
|
|
||
|
|
NSYNC_CPP_END_
|
||
|
|
|
||
|
|
#endif /*NSYNC_INTERNAL_DLL_H_*/
|