mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-09-16 14:00:41 +02:00
bd61a623ac
Fully update git head, and update back branches in ./COPYRIGHT and legal.sgml files.
83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* resowner.h
|
|
* POSTGRES resource owner definitions.
|
|
*
|
|
* Query-lifespan resources are tracked by associating them with
|
|
* ResourceOwner objects. This provides a simple mechanism for ensuring
|
|
* that such resources are freed at the right time.
|
|
* See utils/resowner/README for more info.
|
|
*
|
|
*
|
|
* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
* src/include/utils/resowner.h
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifndef RESOWNER_H
|
|
#define RESOWNER_H
|
|
|
|
|
|
/*
|
|
* ResourceOwner objects are an opaque data structure known only within
|
|
* resowner.c.
|
|
*/
|
|
typedef struct ResourceOwnerData *ResourceOwner;
|
|
|
|
|
|
/*
|
|
* Globally known ResourceOwners
|
|
*/
|
|
extern PGDLLIMPORT ResourceOwner CurrentResourceOwner;
|
|
extern PGDLLIMPORT ResourceOwner CurTransactionResourceOwner;
|
|
extern PGDLLIMPORT ResourceOwner TopTransactionResourceOwner;
|
|
|
|
/*
|
|
* Resource releasing is done in three phases: pre-locks, locks, and
|
|
* post-locks. The pre-lock phase must release any resources that are
|
|
* visible to other backends (such as pinned buffers); this ensures that
|
|
* when we release a lock that another backend may be waiting on, it will
|
|
* see us as being fully out of our transaction. The post-lock phase
|
|
* should be used for backend-internal cleanup.
|
|
*/
|
|
typedef enum
|
|
{
|
|
RESOURCE_RELEASE_BEFORE_LOCKS,
|
|
RESOURCE_RELEASE_LOCKS,
|
|
RESOURCE_RELEASE_AFTER_LOCKS
|
|
} ResourceReleasePhase;
|
|
|
|
/*
|
|
* Dynamically loaded modules can get control during ResourceOwnerRelease
|
|
* by providing a callback of this form.
|
|
*/
|
|
typedef void (*ResourceReleaseCallback) (ResourceReleasePhase phase,
|
|
bool isCommit,
|
|
bool isTopLevel,
|
|
void *arg);
|
|
|
|
|
|
/*
|
|
* Functions in resowner.c
|
|
*/
|
|
|
|
/* generic routines */
|
|
extern ResourceOwner ResourceOwnerCreate(ResourceOwner parent,
|
|
const char *name);
|
|
extern void ResourceOwnerRelease(ResourceOwner owner,
|
|
ResourceReleasePhase phase,
|
|
bool isCommit,
|
|
bool isTopLevel);
|
|
extern void ResourceOwnerDelete(ResourceOwner owner);
|
|
extern ResourceOwner ResourceOwnerGetParent(ResourceOwner owner);
|
|
extern void ResourceOwnerNewParent(ResourceOwner owner,
|
|
ResourceOwner newparent);
|
|
extern void RegisterResourceReleaseCallback(ResourceReleaseCallback callback,
|
|
void *arg);
|
|
extern void UnregisterResourceReleaseCallback(ResourceReleaseCallback callback,
|
|
void *arg);
|
|
|
|
#endif /* RESOWNER_H */
|