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Fix a comment in btree.c (CVS 3702)

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FossilOrigin-Name: 05700c11a9e5177a437d2240e72fb61ea47b973b
This commit is contained in:
drh 2007-03-19 11:54:10 +00:00
parent 4099f6e129
commit fe5d71dd7f
3 changed files with 14 additions and 23 deletions
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14
manifest
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@ -1,5 +1,5 @@
C Changes\sto\ssupport\smedium\ssector\ssizes\slarger\sthan\sthe\sdatabase\spage\ssize.\s(CVS\s3701)
D 2007-03-19T11:25:20
C Fix\sa\scomment\sin\sbtree.c\s(CVS\s3702)
D 2007-03-19T11:54:10
F Makefile.in 1fe3d0b46e40fd684e1e61f8e8056cefed16de9f
F Makefile.linux-gcc 2d8574d1ba75f129aba2019f0b959db380a90935
F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
@ -58,7 +58,7 @@ F src/alter.c 2c79ec40f65e33deaf90ca493422c74586e481a3
F src/analyze.c 7d2b7ab9a9c2fd6e55700f69064dfdd3e36d7a8a
F src/attach.c fd286a9140a2df84b1482f052b67ff5fad9569a1
F src/auth.c 902f4722661c796b97f007d9606bd7529c02597f
F src/btree.c 4336ada77332acb947af6d382f0f3648ea9d8b6c
F src/btree.c f5278b44929198098ed382101ce97b58ceacb5cd
F src/btree.h 066444ee25bd6e6accb997bfd2cf5ace14dbcd00
F src/build.c f2edc786b5bf165a7d0949ed3a5872455a610c0e
F src/callback.c 31d22b4919c7645cbcbb1591ce2453e8c677c558
@ -437,7 +437,7 @@ F www/tclsqlite.tcl bb0d1357328a42b1993d78573e587c6dcbc964b9
F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
F www/whentouse.tcl 97e2b5cd296f7d8057e11f44427dea8a4c2db513
P 5752d84d374205e011d49b0221d6237967fe0743
R 35e0cdc81bf64a560c8bcc30c7e3b7e8
U danielk1977
Z 835c96473334a1bbc531e7fce3e63932
P 3a3e8eb25d8e04cfccc5c0513ed04efcc25d3dbf
R a297b1419430310b47806366b750440a
U drh
Z 55992e8d0ba687290ede6e38f8418c27

2
manifest.uuid
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@ -1 +1 @@
3a3e8eb25d8e04cfccc5c0513ed04efcc25d3dbf
05700c11a9e5177a437d2240e72fb61ea47b973b

21
src/btree.c
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@ -9,7 +9,7 @@
** May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.339 2007/03/19 11:25:20 danielk1977 Exp $
** $Id: btree.c,v 1.340 2007/03/19 11:54:10 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@ -2649,25 +2649,16 @@ static int dfltCompare(
**
** 1: The cursor must have been opened with wrFlag==1
**
** 2: No other cursors may be open with wrFlag==0 on the same table
** 2: Other database connections that share the same pager cache
** but which are not in the READ_UNCOMMITTED state may not have
** cursors open with wrFlag==0 on the same table. Otherwise
** the changes made by this write cursor would be visible to
** the read cursors in the other database connection.
**
** 3: The database must be writable (not on read-only media)
**
** 4: There must be an active transaction.
**
** Condition 2 warrants further discussion. If any cursor is opened
** on a table with wrFlag==0, that prevents all other cursors from
** writing to that table. This is a kind of "read-lock". When a cursor
** is opened with wrFlag==0 it is guaranteed that the table will not
** change as long as the cursor is open. This allows the cursor to
** do a sequential scan of the table without having to worry about
** entries being inserted or deleted during the scan. Cursors should
** be opened with wrFlag==0 only if this read-lock property is needed.
** That is to say, cursors should be opened with wrFlag==0 only if they
** intend to use the sqlite3BtreeNext() system call. All other cursors
** should be opened with wrFlag==1 even if they never really intend
** to write.
**
** No checking is done to make sure that page iTable really is the
** root page of a b-tree. If it is not, then the cursor acquired
** will not work correctly.