diff options
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/miscadmin.h | 9 | ||||
| -rw-r--r-- | src/include/storage/proc.h | 14 |
2 files changed, 19 insertions, 4 deletions
diff --git a/src/include/miscadmin.h b/src/include/miscadmin.h index d3ff1d22795..ea7efefaf08 100644 --- a/src/include/miscadmin.h +++ b/src/include/miscadmin.h @@ -346,8 +346,9 @@ typedef enum BackendType /* * Auxiliary processes. These have PGPROC entries, but they are not - * attached to any particular database. There can be only one of each of - * these running at a time. + * attached to any particular database, and cannot run transactions or + * even take heavyweight locks. There can be only one of each of these + * running at a time. * * If you modify these, make sure to update NUM_AUXILIARY_PROCS and the * glossary in the docs. @@ -384,6 +385,10 @@ extern PGDLLIMPORT BackendType MyBackendType; #define AmWalSummarizerProcess() (MyBackendType == B_WAL_SUMMARIZER) #define AmWalWriterProcess() (MyBackendType == B_WAL_WRITER) +#define AmSpecialWorkerProcess() \ + (AmAutoVacuumLauncherProcess() || \ + AmLogicalSlotSyncWorkerProcess()) + extern const char *GetBackendTypeDesc(BackendType backendType); extern void SetDatabasePath(const char *path); diff --git a/src/include/storage/proc.h b/src/include/storage/proc.h index 9488bf1857c..e1281b44730 100644 --- a/src/include/storage/proc.h +++ b/src/include/storage/proc.h @@ -404,7 +404,7 @@ typedef struct PROC_HDR uint32 allProcCount; /* Head of list of free PGPROC structures */ dlist_head freeProcs; - /* Head of list of autovacuum's free PGPROC structures */ + /* Head of list of autovacuum & special worker free PGPROC structures */ dlist_head autovacFreeProcs; /* Head of list of bgworker free PGPROC structures */ dlist_head bgworkerFreeProcs; @@ -435,8 +435,18 @@ extern PGDLLIMPORT PGPROC *PreparedXactProcs; #define GetNumberFromPGProc(proc) ((proc) - &ProcGlobal->allProcs[0]) /* + * We set aside some extra PGPROC structures for "special worker" processes, + * which are full-fledged backends (they can run transactions) + * but are unique animals that there's never more than one of. + * Currently there are two such processes: the autovacuum launcher + * and the slotsync worker. + */ +#define NUM_SPECIAL_WORKER_PROCS 2 + +/* * We set aside some extra PGPROC structures for auxiliary processes, - * ie things that aren't full-fledged backends but need shmem access. + * ie things that aren't full-fledged backends (they cannot run transactions + * or take heavyweight locks) but need shmem access. * * Background writer, checkpointer, WAL writer, WAL summarizer, and archiver * run during normal operation. Startup process and WAL receiver also consume |