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https://github.com/sqlite/sqlite.git
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Do not use the page containing locks for anything to avoid problems with
the manditory file locking on windows. (CVS 1595) FossilOrigin-Name: 5a814202777f381caf5337b37e11c9ab8b8f554a
This commit is contained in:
16
manifest
16
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@@ -1,5 +1,5 @@
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C Add\sthe\ssqlite3OsFileModTime()\sinterface.\s\sBut\sit\sis\sstill\sunused.\s\sThe\nchange\scounter\sin\spage\s1\sis\salways\sincremented.\s(CVS\s1594)
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D 2004-06-15T00:29:04
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C Do\snot\suse\sthe\spage\scontaining\slocks\sfor\sanything\sto\savoid\sproblems\swith\nthe\smanditory\sfile\slocking\son\swindows.\s(CVS\s1595)
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D 2004-06-15T01:40:29
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F Makefile.in ab7b0d5118e2da97bac66be8684a1034e3500f5a
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F Makefile.linux-gcc a9e5a0d309fa7c38e7c14d3ecf7690879d3a5457
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F README f1de682fbbd94899d50aca13d387d1b3fd3be2dd
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@@ -26,7 +26,7 @@ F sqlite.def fc4f5734786fe4743cfe2aa98eb2da4b089edb5f
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F sqlite.pc.in 30552343140c53304c2a658c080fbe810cd09ca2
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F src/attach.c 93b8ecec4a8d7b4e9f2479e2327d90c9d01765e8
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F src/auth.c 204e1e9c45e64315589bc8b62cba5d9de29b6a3c
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F src/btree.c 1bed18993e54483de8ff869142e82c48847e1d50
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F src/btree.c a9aabed057eacdaf617caeddc7b136bd831ab22c
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F src/btree.h 32f96abef464cf8765b23ca669acfe90d191fcc5
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F src/build.c 916a84fa5f8bfd44dbe14c3d7c923dd07ee7373f
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F src/date.c 65b483caeb0e4dd663667d2f927caa058168ebff
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@@ -40,7 +40,7 @@ F src/insert.c 68c7f3ddd6a7f1e5596d6996da1a2861b3789a3a
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F src/legacy.c ad23746f15f67e34577621b1875f639c94839e1f
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F src/main.c a62c08c9d315c3ebc58bfb6b52ab5953ee8a3089
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F src/md5.c d77a389955759c8329bb357e3d71bac3d6eb710b
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F src/os.h be7323afb3d371bcab438556ddb5fda397e3d815
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F src/os.h 1cb5f0293a30288451fe3c0c73815cf208212ed1
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F src/os_common.h ba1b7306e16e2091718f2c48db0fe6c1d7a31bb8
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F src/os_mac.c 129029f9faecf1133edcf72eaedd54c1c838b140
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F src/os_mac.h 51d2445f47e182ed32d3bd6937f81070c6fd9bd4
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@@ -48,7 +48,7 @@ F src/os_unix.c 7eac2e840300848818f53e6e78cd19d128e936bd
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F src/os_unix.h 1cd6133cf66dea704b8646b70b2dfdcbdd9b3738
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F src/os_win.c a60f9ebfb0ce3e5b2ce259f981af59a50b24fc8d
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F src/os_win.h 004eec47b1780fcaf07420ddc2072294b698d48c
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F src/pager.c d42af374b23b50805b42c08cbba5bd70dd73964f
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F src/pager.c bf81f3c8105f8b257ee07575d0040ee2c3822a51
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F src/pager.h bc58d32a9dee464f7268fb68652c130a4216e438
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F src/parse.y 097438674976355a10cf177bd97326c548820b86
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F src/pragma.c e288bd122d3ca41ec2032475abde1ff5fa3095f4
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@@ -223,7 +223,7 @@ F www/support.tcl 1801397edd271cc39a2aadd54e701184b5181248
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F www/tclsqlite.tcl 19191cf2a1010eaeff74c51d83fd5f5a4d899075
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F www/vdbe.tcl 59288db1ac5c0616296b26dce071c36cb611dfe9
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F www/whentouse.tcl a8335bce47cc2fddb07f19052cb0cb4d9129a8e4
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P af6edd2c0ad160435acd5bfa7af36c4f394f0bb8
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R 8390b0ef3815bc1230f728916c2a8366
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P 186c6f93e12978907c5f0ff81d90bdf7367b9274
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R 39de485059268cbc8025aa3dc3a9cdaa
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U drh
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Z b91d1156cec1d19e076cf36f8583344f
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Z f0561e35a6d128f341936bb7b7366398
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@@ -1 +1 @@
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186c6f93e12978907c5f0ff81d90bdf7367b9274
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5a814202777f381caf5337b37e11c9ab8b8f554a
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@@ -9,7 +9,7 @@
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** $Id: btree.c,v 1.166 2004/06/14 06:03:57 danielk1977 Exp $
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** $Id: btree.c,v 1.167 2004/06/15 01:40:29 drh Exp $
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**
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** This file implements a external (disk-based) database using BTrees.
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** For a detailed discussion of BTrees, refer to
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@@ -207,6 +207,7 @@
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#include "sqliteInt.h"
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#include "pager.h"
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#include "btree.h"
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#include "os.h"
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#include <assert.h>
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@@ -4146,6 +4147,10 @@ char *sqlite3BtreeIntegrityCheck(Btree *pBt, int *aRoot, int nRoot){
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}
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sCheck.anRef = sqliteMallocRaw( (sCheck.nPage+1)*sizeof(sCheck.anRef[0]) );
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for(i=0; i<=sCheck.nPage; i++){ sCheck.anRef[i] = 0; }
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i = PENDING_BYTE/pBt->pageSize + 1;
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if( i<=sCheck.nPage ){
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sCheck.anRef[i] = 1;
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}
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sCheck.zErrMsg = 0;
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/* Check the integrity of the freelist
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35
src/os.h
35
src/os.h
@@ -91,18 +91,13 @@
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#define EXCLUSIVE_LOCK 4
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/*
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** Windows file locking notes:
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** File Locking Notes: (Mostly about windows but also some info for Unix)
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**
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** We cannot use LockFileEx() or UnlockFileEx() on Win95/98/ME because
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** those functions are not available. So we use only LockFile() and
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** UnlockFile().
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**
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** LockFile() prevents not just writing but also reading by other processes.
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** (This is a design error on the part of Windows, but there is nothing
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** we can do about that.) So the region used for locking is at the
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** end of the file where it is unlikely to ever interfere with an
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** actual read attempt.
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**
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** A SHARED_LOCK is obtained by locking a single randomly-chosen
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** byte out of a specific range of bytes. The lock byte is obtained at
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** random so two separate readers can probably access the file at the
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@@ -129,16 +124,32 @@
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** These #defines are available in os.h so that Unix can use the same
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** byte ranges for locking. This leaves open the possiblity of having
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** clients on win95, winNT, and unix all talking to the same shared file
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** and all locking correctly.
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** and all locking correctly. To do so would require that samba (or whatever
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** tool is being used for file sharing) implements locks correctly between
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** windows and unix. I'm guessing that isn't likely to happen, but by
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** using the same locking range we are at least open to the possibility.
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**
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** Locking in windows is manditory. For this reason, we cannot store
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** actual data in the bytes used for locking. The pager never allocates
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** the pages involved in locking therefore.
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** the pages involved in locking therefore. SHARED_SIZE is selected so
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** that all locks will fit on a single page even at the minimum page size.
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** PENDING_BYTE defines the beginning of the locks. By default PENDING_BYTE
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** is set high so that we don't have to allocate an unused page except
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** for very large databases. But one should test the page skipping logic
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** by setting PENDING_BYTE low and running the entire regression suite.
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**
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** Changing the value of PENDING_BYTE results in a subtly incompatible
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** file format. Depending on how it is changed, you might not notice
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** the incompatibility right away, even running a full regression test.
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** The default location of PENDING_BYTE is the first byte past the
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** 1GB boundary.
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**
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*/
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#define SHARED_SIZE 10238
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#define SHARED_FIRST (0x3fffffff - (SHARED_SIZE - 1))
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#define RESERVED_BYTE (SHARED_FIRST - 1)
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#define PENDING_BYTE (RESERVED_BYTE - 1)
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#define PENDING_BYTE 0x40000000 /* First byte past the 1GB boundary */
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/* #define PENDING_BYTE 0x5400 // Page 20 - for testing */
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#define RESERVED_BYTE (PENDING_BYTE+1)
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#define SHARED_FIRST (PENDING_BYTE+2)
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#define SHARED_SIZE 510
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int sqlite3OsDelete(const char*);
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@@ -18,7 +18,7 @@
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** file simultaneously, or one process from reading the database while
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** another is writing.
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**
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** @(#) $Id: pager.c,v 1.126 2004/06/14 06:03:57 danielk1977 Exp $
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** @(#) $Id: pager.c,v 1.127 2004/06/15 01:40:29 drh Exp $
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*/
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#include "os.h" /* Must be first to enable large file support */
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#include "sqliteInt.h"
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@@ -1205,6 +1205,9 @@ int sqlite3pager_pagecount(Pager *pPager){
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return 0;
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}
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n /= SQLITE_PAGE_SIZE;
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if( !pPager->memDb && n==PENDING_BYTE/SQLITE_PAGE_SIZE ){
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n++;
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}
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if( pPager->state!=PAGER_UNLOCK ){
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pPager->dbSize = n;
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}
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@@ -2209,6 +2212,9 @@ int sqlite3pager_write(void *pData){
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*/
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if( pPager->dbSize<(int)pPg->pgno ){
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pPager->dbSize = pPg->pgno;
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if( !pPager->memDb && pPager->dbSize==PENDING_BYTE/pPager->pageSize ){
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pPager->dbSize++;
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}
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}
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return rc;
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}
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