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Fix a performance regression: Keep two btree masks in each prepared

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statement; one for btrees used and another for btrees that require locks.
Only try to lock the btrees identified by the second mask.

FossilOrigin-Name: 614de91a504d2231009a9de1305e31fce1b1c5a6
This commit is contained in:
drh
2011-04-06 22:05:53 +00:00
parent dc5df0f824
commit dc5b047ec3
7 changed files with 44 additions and 24 deletions
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src/btree.h
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@@ -212,6 +212,7 @@ void sqlite3BtreeCursorList(Btree*);
#endif
#if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE
int sqlite3BtreeSharable(Btree*);
void sqlite3BtreeLeave(Btree*);
void sqlite3BtreeEnterCursor(BtCursor*);
void sqlite3BtreeLeaveCursor(BtCursor*);
@@ -224,6 +225,7 @@ void sqlite3BtreeCursorList(Btree*);
#endif
#else
# define sqlite3BtreeSharable(X) 0
# define sqlite3BtreeLeave(X)
# define sqlite3BtreeEnterCursor(X)
# define sqlite3BtreeLeaveCursor(X)