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proclist_types.h
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1/*-------------------------------------------------------------------------
2 *
3 * proclist_types.h
4 * doubly-linked lists of pgprocnos
5 *
6 * See proclist.h for functions that operate on these types.
7 *
8 * Portions Copyright (c) 2016-2025, PostgreSQL Global Development Group
9 *
10 * IDENTIFICATION
11 * src/include/storage/proclist_types.h
12 *-------------------------------------------------------------------------
13 */
14
15#ifndef PROCLIST_TYPES_H
16#define PROCLIST_TYPES_H
17
18#include "storage/procnumber.h"
19
20/*
21 * A node in a doubly-linked list of processes. The link fields contain
22 * the 0-based PGPROC indexes of the next and previous process, or
23 * INVALID_PROC_NUMBER in the next-link of the last node and the prev-link
24 * of the first node. A node that is currently not in any list
25 * should have next == prev == 0; this is not a possible state for a node
26 * that is in a list, because we disallow circularity.
27 */
28typedef struct proclist_node
29{
30 ProcNumber next; /* pgprocno of the next PGPROC */
31 ProcNumber prev; /* pgprocno of the prev PGPROC */
33
34/*
35 * Header of a doubly-linked list of PGPROCs, identified by pgprocno.
36 * An empty list is represented by head == tail == INVALID_PROC_NUMBER.
37 */
38typedef struct proclist_head
39{
40 ProcNumber head; /* pgprocno of the head PGPROC */
41 ProcNumber tail; /* pgprocno of the tail PGPROC */
43
44/*
45 * List iterator allowing some modifications while iterating.
46 */
48{
49 ProcNumber cur; /* pgprocno of the current PGPROC */
50 ProcNumber next; /* pgprocno of the next PGPROC */
52
53#endif /* PROCLIST_TYPES_H */
struct proclist_head proclist_head
struct proclist_node proclist_node
struct proclist_mutable_iter proclist_mutable_iter
int ProcNumber
Definition: procnumber.h:24
ProcNumber head
ProcNumber tail
ProcNumber prev
ProcNumber next