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Restructure padding to handle structure already 128 bytes(alpha).

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This commit is contained in:
Bruce Momjian 1997-01-25 03:09:33 +00:00
parent 60265ee651
commit 6dbe1be690
1 changed files with 12 additions and 7 deletions
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19
src/include/storage/buf_internals.h
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@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: buf_internals.h,v 1.10 1997/01/23 18:15:29 momjian Exp $
* $Id: buf_internals.h,v 1.11 1997/01/25 03:09:33 momjian Exp $
*
* NOTE
* If BUFFERPAGE0 is defined, then 0 will be used as a
@ -115,12 +115,13 @@ struct sbufdesc_unpadded {
BufFlags flags;
int16 bufsmgr;
unsigned refcount;
char sb_dbname[NAMEDATALEN+1];
char sb_relname[NAMEDATALEN+1];
#ifdef HAS_TEST_AND_SET
slock_t io_in_progress_lock;
#endif /* HAS_TEST_AND_SET */
/* NOTE NO sb_pad HERE */
char sb_dbname[NAMEDATALEN+1];
/* NOTE NO PADDING OF THE MEMBER HERE */
char sb_relname[NAMEDATALEN+1];
};
/* THE REAL STRUCTURE - the structure above must match it, minus sb_pad */
@ -137,13 +138,13 @@ struct sbufdesc {
int16 bufsmgr; /* storage manager id for buffer */
unsigned refcount; /* # of times buffer is pinned */
char sb_dbname[NAMEDATALEN+1]; /* name of db in which buf belongs */
char sb_relname[NAMEDATALEN+1]; /* name of reln */
#ifdef HAS_TEST_AND_SET
/* can afford a dedicated lock if test-and-set locks are available */
slock_t io_in_progress_lock;
#endif /* HAS_TEST_AND_SET */
char sb_dbname[NAMEDATALEN+1]; /* name of db in which buf belongs */
/*
* I padded this structure to a power of 2 (PADDED_SBUFDESC_SIZE) because
* BufferDescriptorGetBuffer is called a billion times and it does an
@ -155,7 +156,11 @@ struct sbufdesc {
* going to make some of these types bigger soon anyway... -pma 1/2/93
*/
char sb_pad[PADDED_SBUFDESC_SIZE-sizeof(struct sbufdesc_unpadded)];
/* please, don't take the sizeof() this member and use it for
something important */
char sb_relname[NAMEDATALEN+1+ /* name of reln */
PADDED_SBUFDESC_SIZE-sizeof(struct sbufdesc_unpadded)];
};
/*