diff options
Diffstat (limited to 'db2/include/btree.h')
| -rw-r--r-- | db2/include/btree.h | 62 |
1 files changed, 44 insertions, 18 deletions
diff --git a/db2/include/btree.h b/db2/include/btree.h index 878096b7b2..1660d331e7 100644 --- a/db2/include/btree.h +++ b/db2/include/btree.h @@ -1,7 +1,7 @@ /*- * See the file LICENSE for redistribution information. * - * Copyright (c) 1996, 1997 + * Copyright (c) 1996, 1997, 1998 * Sleepycat Software. All rights reserved. */ /* @@ -43,7 +43,7 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * @(#)btree.h 10.17 (Sleepycat) 9/23/97 + * @(#)btree.h 10.21 (Sleepycat) 5/23/98 */ /* Forward structure declarations. */ @@ -103,28 +103,39 @@ struct __recno; typedef struct __recno RECNO; * to return deleted entries. To simplify both the mnemonic representation * and the code that checks for various cases, we construct a set of bitmasks. */ -#define S_READ 0x0001 /* Read locks. */ -#define S_WRITE 0x0002 /* Write locks. */ - -#define S_APPEND 0x0040 /* Append to the tree. */ -#define S_DELNO 0x0080 /* Don't return deleted items. */ -#define S_DUPFIRST 0x0100 /* Return first duplicate. */ -#define S_DUPLAST 0x0200 /* Return last duplicate. */ -#define S_EXACT 0x0400 /* Exact items only. */ -#define S_PARENT 0x0800 /* Lock page pair. */ - -#define S_DELETE (S_WRITE | S_DUPFIRST | S_DELNO | S_EXACT) +#define S_READ 0x00001 /* Read locks. */ +#define S_WRITE 0x00002 /* Write locks. */ + +#define S_APPEND 0x00040 /* Append to the tree. */ +#define S_DELNO 0x00080 /* Don't return deleted items. */ +#define S_DUPFIRST 0x00100 /* Return first duplicate. */ +#define S_DUPLAST 0x00200 /* Return last duplicate. */ +#define S_EXACT 0x00400 /* Exact items only. */ +#define S_PARENT 0x00800 /* Lock page pair. */ +#define S_STACK 0x01000 /* Need a complete stack. */ + +#define S_DELETE (S_WRITE | S_DUPFIRST | S_DELNO | S_EXACT | S_STACK) #define S_FIND (S_READ | S_DUPFIRST | S_DELNO) -#define S_INSERT (S_WRITE | S_DUPLAST) -#define S_KEYFIRST (S_WRITE | S_DUPFIRST) -#define S_KEYLAST (S_WRITE | S_DUPLAST) +#define S_INSERT (S_WRITE | S_DUPLAST | S_STACK) +#define S_KEYFIRST (S_WRITE | S_DUPFIRST | S_STACK) +#define S_KEYLAST (S_WRITE | S_DUPLAST | S_STACK) #define S_WRPAIR (S_WRITE | S_DUPLAST | S_PARENT) /* + * If doing insert search (including keyfirst or keylast operations) or a + * split search on behalf of an insert, it's okay to return the entry one + * past the end of the page. + */ +#define PAST_END_OK(f) \ + ((f) == S_INSERT || \ + (f) == S_KEYFIRST || (f) == S_KEYLAST || (f) == S_WRPAIR) + +/* * Flags to __bam_iitem(). */ -#define BI_NEWKEY 0x01 /* New key. */ -#define BI_DELETED 0x02 /* Key/data pair only placeholder. */ +#define BI_DELETED 0x01 /* Key/data pair only placeholder. */ +#define BI_DOINCR 0x02 /* Increment the record count. */ +#define BI_NEWKEY 0x04 /* New key. */ /* * Various routines pass around page references. A page reference can be a @@ -138,6 +149,21 @@ struct __epg { }; /* + * All cursors are queued from the master DB structure. Convert the user's + * DB reference to the master DB reference. We lock the master DB mutex + * so that we can walk the cursor queue. There's no race in accessing the + * cursors, because if we're modifying a page, we have a write lock on it, + * and therefore no other thread than the current one can have a cursor that + * references the page. + */ +#define CURSOR_SETUP(dbp) { \ + (dbp) = (dbp)->master; \ + DB_THREAD_LOCK(dbp); \ +} +#define CURSOR_TEARDOWN(dbp) \ + DB_THREAD_UNLOCK(dbp); + +/* * Btree cursor. * * Arguments passed to __bam_ca_replace(). |