memory/mozjemalloc/linkedlist.h
author Matt Howell <mhowell@mozilla.com>
Wed, 24 Aug 2016 10:01:10 -0700
changeset 315853 0bf376ad9b85c1eb5ec3707428151390788976a1
parent 96055 87bd340fac6aa9f70c42bb4a8fbe0b7325277b0d
permissions -rw-r--r--
Bug 1292360 - Add attribution data to the telemetry environment block; r=gfritzsche, data-review=bsmedberg MozReview-Commit-ID: 4sltJYJrrFS

/* -*- Mode: C; tab-width: 8; c-basic-offset: 8; indent-tabs-mode: t -*- */
/* vim:set softtabstop=8 shiftwidth=8 noet: */
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#ifndef linkedlist_h__
#define linkedlist_h__

#include <stddef.h>

typedef struct LinkedList_s LinkedList;

struct LinkedList_s {
	LinkedList *next;
	LinkedList *prev;
};

/* Convert from LinkedList* to foo*. */
#define LinkedList_Get(e, type, prop) \
  (type*)((char*)(e) - offsetof(type, prop))

/* Insert |e| at the beginning of |l|.  */
void LinkedList_InsertHead(LinkedList *l, LinkedList *e)
{
	e->next = l;
	e->prev = l->prev;
	e->next->prev = e;
	e->prev->next = e;
}

void LinkedList_Remove(LinkedList *e)
{
	e->prev->next = e->next;
	e->next->prev = e->prev;
	e->next = e;
	e->prev = e;
}

bool LinkedList_IsEmpty(LinkedList *e)
{
	return e->next == e;
}

void LinkedList_Init(LinkedList *e)
{
	e->next = e;
	e->prev = e;
}

#endif