diff options
Diffstat (limited to 'src/include/storage/proc.h')
| -rw-r--r-- | src/include/storage/proc.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/src/include/storage/proc.h b/src/include/storage/proc.h index 5a3dd5d2d40..14e34d4e933 100644 --- a/src/include/storage/proc.h +++ b/src/include/storage/proc.h @@ -408,7 +408,7 @@ 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; @@ -443,8 +443,18 @@ 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 |