linkedlists.h

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#ifndef ASTERISK_LINKEDLISTS_H
#define ASTERISK_LINKEDLISTS_H

#include <asterisk/lock.h>

#define AST_LIST_LOCK(head)                  \
   ast_mutex_lock(&head->lock) 
   
#define AST_LIST_UNLOCK(head)                   \
   ast_mutex_unlock(&head->lock)

#define AST_LIST_HEAD(name, type)               \
struct name {                       \
   struct type *first;                 \
   ast_mutex_t lock;                \
}

#define AST_LIST_HEAD_SET(head,entry) do {            \
   (head)->first=(entry);                 \
   ast_pthread_mutex_init(&(head)->lock,NULL);           \
} while (0)

#define AST_LIST_ENTRY(type)                 \
struct {                      \
   struct type *next;                  \
}
 
#define  AST_LIST_FIRST(head) ((head)->first)

#define AST_LIST_NEXT(elm, field)   ((elm)->field.next)

#define  AST_LIST_EMPTY(head) (AST_LIST_FIRST(head) == NULL)

#define AST_LIST_TRAVERSE(head,var,field)             \
   for((var) = (head)->first; (var); (var) = (var)->field.next)

#define AST_LIST_HEAD_INIT(head) {                 \
   (head)->first = NULL;                  \
   ast_pthread_mutex_init(&(head)->lock,NULL);           \
}

#define AST_LIST_INSERT_AFTER(listelm, elm, field) do {     \
   (elm)->field.next = (listelm)->field.next;         \
   (listelm)->field.next = (elm);            \
} while (0)

#define AST_LIST_INSERT_HEAD(head, elm, field) do {         \
      (elm)->field.next = (head)->first;        \
      (head)->first = (elm);              \
} while (0)

#define AST_LIST_INSERT_TAIL(head, elm, type, field) do {             \
      struct type *curelm = (head)->first;                            \
      if(!curelm) {                                                   \
              AST_LIST_INSERT_HEAD(head, elm, field);                 \
      } else {                                                        \
              while ( curelm->field.next!=NULL ) {                    \
                      curelm=curelm->field.next;                      \
              }                                                       \
              AST_LIST_INSERT_AFTER(curelm,elm,field);                \
      }                                                               \
} while (0)


#define AST_LIST_REMOVE_HEAD(head, field) do {              \
      (head)->first = (head)->first->field.next;         \
   } while (0)

#define AST_LIST_REMOVE(head, elm, type, field) do {        \
   if ((head)->first == (elm)) {             \
      AST_LIST_REMOVE_HEAD((head), field);         \
   }                       \
   else {                        \
      struct type *curelm = (head)->first;         \
      while( curelm->field.next != (elm) )         \
         curelm = curelm->field.next;        \
      curelm->field.next =             \
          curelm->field.next->field.next;       \
   }                       \
} while (0)

#endif

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