diff options
Diffstat (limited to 'db2/include/mp.h')
| -rw-r--r-- | db2/include/mp.h | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/db2/include/mp.h b/db2/include/mp.h index 8635efa722..904bccfe98 100644 --- a/db2/include/mp.h +++ b/db2/include/mp.h @@ -4,7 +4,7 @@ * Copyright (c) 1996, 1997, 1998 * Sleepycat Software. All rights reserved. * - * @(#)mp.h 10.33 (Sleepycat) 5/4/98 + * @(#)mp.h 10.37 (Sleepycat) 1/1/99 */ struct __bh; typedef struct __bh BH; @@ -16,11 +16,11 @@ struct __mpoolfile; typedef struct __mpoolfile MPOOLFILE; #define DB_DEFAULT_MPOOL_FILE "__db_mpool.share" /* - * We default to 128K (16 8K pages) if the user doesn't specify, and + * We default to 256K (32 8K pages) if the user doesn't specify, and * require a minimum of 20K. */ #ifndef DB_CACHESIZE_DEF -#define DB_CACHESIZE_DEF (128 * 1024) +#define DB_CACHESIZE_DEF (256 * 1024) #endif #define DB_CACHESIZE_MIN ( 20 * 1024) @@ -106,6 +106,12 @@ struct __mpoolfile; typedef struct __mpoolfile MPOOLFILE; if (F_ISSET(dbmp, MP_LOCKREGION)) \ (void)__db_mutex_unlock(&(bhp)->mutex, (dbmp)->reginfo.fd) +/* Check for region catastrophic shutdown. */ +#define MP_PANIC_CHECK(dbmp) { \ + if ((dbmp)->mp->rlayout.panic) \ + return (DB_RUNRECOVERY); \ +} + /* * DB_MPOOL -- * Per-process memory pool structure. @@ -158,6 +164,18 @@ struct __db_mpoolfile { int fd; /* Underlying file descriptor. */ + u_int32_t ref; /* Reference count. */ + + /* + * !!! + * This field is a special case -- it's protected by the region lock + * NOT the thread lock. The reason for this is that we always have + * the region lock immediately before or after we modify the field, + * and we don't want to use the structure lock to protect it because + * then I/O (which is done with the structure lock held because of + * the race between the seek and write of the file descriptor) will + * block any other put/get calls using this DB_MPOOLFILE structure. + */ u_int32_t pinref; /* Pinned block reference count. */ /* These fields are not protected. */ |