diff options
Diffstat (limited to 'src/include/storage/sinvaladt.h')
| -rw-r--r-- | src/include/storage/sinvaladt.h | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/src/include/storage/sinvaladt.h b/src/include/storage/sinvaladt.h index 18a14895d77..1d49eb8c620 100644 --- a/src/include/storage/sinvaladt.h +++ b/src/include/storage/sinvaladt.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: sinvaladt.h,v 1.20 2000/01/26 05:58:33 momjian Exp $ + * $Id: sinvaladt.h,v 1.21 2000/04/12 17:16:52 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -20,7 +20,7 @@ /* * The shared cache invalidation manager is responsible for transmitting - * invalidation messages between backends. Any message sent by any backend + * invalidation messages between backends. Any message sent by any backend * must be delivered to all already-running backends before it can be * forgotten. * @@ -35,7 +35,7 @@ * In reality, the messages are stored in a circular buffer of MAXNUMMESSAGES * entries. We translate MsgNum values into circular-buffer indexes by * computing MsgNum % MAXNUMMESSAGES (this should be fast as long as - * MAXNUMMESSAGES is a constant and a power of 2). As long as maxMsgNum + * MAXNUMMESSAGES is a constant and a power of 2). As long as maxMsgNum * doesn't exceed minMsgNum by more than MAXNUMMESSAGES, we have enough space * in the buffer. If the buffer does overflow, we reset it to empty and * force each backend to "reset", ie, discard all its invalidatable state. @@ -85,16 +85,19 @@ typedef struct ProcState /* Shared cache invalidation memory segment */ typedef struct SISeg { + /* * General state information */ int minMsgNum; /* oldest message still needed */ int maxMsgNum; /* next message number to be assigned */ int maxBackends; /* size of procState array */ + /* * Circular buffer holding shared-inval messages */ - SharedInvalidData buffer[MAXNUMMESSAGES]; + SharedInvalidData buffer[MAXNUMMESSAGES]; + /* * Per-backend state info. * @@ -106,20 +109,19 @@ typedef struct SISeg extern SISeg *shmInvalBuffer; /* pointer to the shared buffer segment, - * set by SISegmentAttach() - */ + * set by SISegmentAttach() */ /* * prototypes for functions in sinvaladt.c */ -extern int SISegmentInit(bool createNewSegment, IPCKey key, - int maxBackends); +extern int SISegmentInit(bool createNewSegment, IPCKey key, + int maxBackends); extern int SIBackendInit(SISeg *segP); extern bool SIInsertDataEntry(SISeg *segP, SharedInvalidData *data); -extern int SIGetDataEntry(SISeg *segP, int backendId, - SharedInvalidData *data); +extern int SIGetDataEntry(SISeg *segP, int backendId, + SharedInvalidData *data); extern void SIDelExpiredDataEntries(SISeg *segP); #endif /* SINVALADT_H */ |