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Initial work on a Win32 VFS with NOP locking.

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FossilOrigin-Name: 549abe3f89b55b05a05f267865a5dd84b8cd335d
This commit is contained in:
mistachkin
2016-07-08 21:14:37 +00:00
parent d3d4b3c698
commit 1e75483cf0
4 changed files with 345 additions and 61 deletions
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18
manifest
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@@ -1,5 +1,5 @@
C Another\sattempt\sto\sfix\serror\shandling\sin\sLemon.\s\sThis\schange\sis\sa\sno-op\sfor\nSQLite's\susage.
D 2016-07-08T19:54:38.723
C Initial\swork\son\sa\sWin32\sVFS\swith\sNOP\slocking.
D 2016-07-08T21:14:37.641
F Makefile.in 6c20d44f72d4564f11652b26291a214c8367e5db
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc d66d0395c38571aab3804f8db0fa20707ae4609a
@@ -368,7 +368,7 @@ F src/os.h 8e976e59eb4ca1c0fca6d35ee803e38951cb0343
F src/os_common.h b2f4707a603e36811d9b1a13278bffd757857b85
F src/os_setup.h c9d4553b5aaa6f73391448b265b89bed0b890faa
F src/os_unix.c a9443cdab41d7f3cdf0df3a5aab62fd6e1c9b234
F src/os_win.c d4b8faf8896b65818e67070711fdd00d8e620bd6
F src/os_win.c 716af57117381c24c0eb43c8dc5a86a6496f98a7
F src/os_win.h eb7a47aa17b26b77eb97e4823f20a00b8bda12ca
F src/pager.c c368634b888b1c8740aea83b36bfd266f2443e60
F src/pager.h 8ab6b6feeee4bc0439bfde7ee59ba99df98b9bc3
@@ -1402,6 +1402,7 @@ F test/wild001.test bca33f499866f04c24510d74baf1e578d4e44b1c
F test/win32heap.test ea19770974795cff26e11575e12d422dbd16893c
F test/win32lock.test fbf107c91d8f5512be5a5b87c4c42ab9fdd54972
F test/win32longpath.test 169c75a3b2e43481f4a62122510210c67b08f26d
F test/win32nolock.test ac4f08811a562e45a5755e661f45ca85892bdbbc
F test/with1.test cef099a491eac9874f2c28bd2dc86394fb3e47b3
F test/with2.test 2b40da883658eb74ad8ad06afabe11a408e7fb87
F test/with3.test 511bacdbe41c49cf34f9fd1bd3245fe1575bca98
@@ -1504,7 +1505,10 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P 8bb8d886ffa948cd7bc66c8c62da76bce233be2e
R 855944636ee976f5addadf9e5d764c10
U drh
Z 1b9ee21867274cd5ef77d7b4ebcc2052
P e1d8ef311cabcb96495a88404991b1416655e4a8
R ba3e2959766a1594f290917f0109fdb1
T *branch * win32nolock
T *sym-win32nolock *
T -sym-trunk *
U mistachkin
Z 21c6555b60ed7b3a758f8d504d1fa54f

2
manifest.uuid
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@@ -1 +1 @@
e1d8ef311cabcb96495a88404991b1416655e4a8
549abe3f89b55b05a05f267865a5dd84b8cd335d

162
src/os_win.c
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@@ -290,6 +290,17 @@ struct winFile {
#endif
};
/*
** The winVfsAppData structure is used for the pAppData member for all of the
** Win32 VFS variants.
*/
typedef struct winVfsAppData winVfsAppData;
struct winVfsAppData {
const sqlite3_io_methods *pMethod; /* The file I/O methods to use. */
void *pAppData; /* The extra pAppData, if any. */
BOOL bNoLock; /* Non-zero if locking is disabled. */
};
/*
** Allowed values for winFile.ctrlFlags
*/
@@ -2611,7 +2622,12 @@ static int winClose(sqlite3_file *id){
}while( rc==0 && ++cnt < MX_CLOSE_ATTEMPT && (sqlite3_win32_sleep(100), 1) );
#if SQLITE_OS_WINCE
#define WINCE_DELETION_ATTEMPTS 3
{
winVfsAppData *pAppData = (winVfsAppData*)pFile->pVfs->pAppData;
if( pAppData==NULL || !pAppData->bNoLock ){
winceDestroyLock(pFile);
}
}
if( pFile->zDeleteOnClose ){
int cnt = 0;
while(
@@ -3343,6 +3359,44 @@ static int winUnlock(sqlite3_file *id, int locktype){
return rc;
}
/******************************************************************************
****************************** No-op Locking **********************************
**
** Of the various locking implementations available, this is by far the
** simplest: locking is ignored. No attempt is made to lock the database
** file for reading or writing.
**
** This locking mode is appropriate for use on read-only databases
** (ex: databases that are burned into CD-ROM, for example.) It can
** also be used if the application employs some external mechanism to
** prevent simultaneous access of the same database by two or more
** database connections. But there is a serious risk of database
** corruption if this locking mode is used in situations where multiple
** database connections are accessing the same database file at the same
** time and one or more of those connections are writing.
*/
static int winNolockLock(sqlite3_file *id, int locktype){
UNUSED_PARAMETER(id);
UNUSED_PARAMETER(locktype);
return SQLITE_OK;
}
static int winNolockCheckReservedLock(sqlite3_file *id, int *pResOut){
UNUSED_PARAMETER(id);
UNUSED_PARAMETER(pResOut);
return SQLITE_OK;
}
static int winNolockUnlock(sqlite3_file *id, int locktype){
UNUSED_PARAMETER(id);
UNUSED_PARAMETER(locktype);
return SQLITE_OK;
}
/******************* End of the no-op lock implementation *********************
******************************************************************************/
/*
** If *pArg is initially negative then this is a query. Set *pArg to
** 1 or 0 depending on whether or not bit mask of pFile->ctrlFlags is set.
@@ -4407,6 +4461,44 @@ static const sqlite3_io_methods winIoMethod = {
winUnfetch /* xUnfetch */
};
/*
** This vector defines all the methods that can operate on an
** sqlite3_file for win32 without performing any locking.
*/
static const sqlite3_io_methods winIoNolockMethod = {
3, /* iVersion */
winClose, /* xClose */
winRead, /* xRead */
winWrite, /* xWrite */
winTruncate, /* xTruncate */
winSync, /* xSync */
winFileSize, /* xFileSize */
winNolockLock, /* xLock */
winNolockUnlock, /* xUnlock */
winNolockCheckReservedLock, /* xCheckReservedLock */
winFileControl, /* xFileControl */
winSectorSize, /* xSectorSize */
winDeviceCharacteristics, /* xDeviceCharacteristics */
winShmMap, /* xShmMap */
winShmLock, /* xShmLock */
winShmBarrier, /* xShmBarrier */
winShmUnmap, /* xShmUnmap */
winFetch, /* xFetch */
winUnfetch /* xUnfetch */
};
static winVfsAppData winAppData = {
&winIoMethod, /* pMethod */
0, /* pAppData */
0 /* bNoLock */
};
static winVfsAppData winNolockAppData = {
&winIoNolockMethod, /* pMethod */
0, /* pAppData */
1 /* bNoLock */
};
/****************************************************************************
**************************** sqlite3_vfs methods ****************************
**
@@ -4739,7 +4831,7 @@ static int winIsDir(const void *zConverted){
** Open a file.
*/
static int winOpen(
sqlite3_vfs *pVfs, /* Used to get maximum path name length */
sqlite3_vfs *pVfs, /* Used to get maximum path length and AppData */
const char *zName, /* Name of the file (UTF-8) */
sqlite3_file *id, /* Write the SQLite file handle here */
int flags, /* Open mode flags */
@@ -4754,6 +4846,7 @@ static int winOpen(
#if SQLITE_OS_WINCE
int isTemp = 0;
#endif
winVfsAppData *pAppData;
winFile *pFile = (winFile*)id;
void *zConverted; /* Filename in OS encoding */
const char *zUtf8Name = zName; /* Filename in UTF-8 encoding */
@@ -4975,8 +5068,12 @@ static int winOpen(
"rc=%s\n", h, zUtf8Name, dwDesiredAccess, pOutFlags, pOutFlags ?
*pOutFlags : 0, (h==INVALID_HANDLE_VALUE) ? "failed" : "ok"));
pAppData = (winVfsAppData*)pVfs->pAppData;
#if SQLITE_OS_WINCE
{
if( isReadWrite && eType==SQLITE_OPEN_MAIN_DB
&& ((pAppData==NULL) || !pAppData->bNoLock)
&& (rc = winceCreateLock(zName, pFile))!=SQLITE_OK
){
osCloseHandle(h);
@@ -4985,6 +5082,7 @@ static int winOpen(
OSTRACE(("OPEN-CE-LOCK name=%s, rc=%s\n", zName, sqlite3ErrName(rc)));
return rc;
}
}
if( isTemp ){
pFile->zDeleteOnClose = zConverted;
}else
@@ -4994,7 +5092,7 @@ static int winOpen(
}
sqlite3_free(zTmpname);
pFile->pMethod = &winIoMethod;
pFile->pMethod = pAppData ? pAppData->pMethod : &winIoMethod;
pFile->pVfs = pVfs;
pFile->h = h;
if( isReadonly ){
@@ -5722,7 +5820,7 @@ int sqlite3_os_init(void){
SQLITE_WIN32_MAX_PATH_BYTES, /* mxPathname */
0, /* pNext */
"win32", /* zName */
0, /* pAppData */
&winAppData, /* pAppData */
winOpen, /* xOpen */
winDelete, /* xDelete */
winAccess, /* xAccess */
@@ -5747,7 +5845,57 @@ int sqlite3_os_init(void){
SQLITE_WINNT_MAX_PATH_BYTES, /* mxPathname */
0, /* pNext */
"win32-longpath", /* zName */
0, /* pAppData */
&winAppData, /* pAppData */
winOpen, /* xOpen */
winDelete, /* xDelete */
winAccess, /* xAccess */
winFullPathname, /* xFullPathname */
winDlOpen, /* xDlOpen */
winDlError, /* xDlError */
winDlSym, /* xDlSym */
winDlClose, /* xDlClose */
winRandomness, /* xRandomness */
winSleep, /* xSleep */
winCurrentTime, /* xCurrentTime */
winGetLastError, /* xGetLastError */
winCurrentTimeInt64, /* xCurrentTimeInt64 */
winSetSystemCall, /* xSetSystemCall */
winGetSystemCall, /* xGetSystemCall */
winNextSystemCall, /* xNextSystemCall */
};
#endif
static sqlite3_vfs winNolockVfs = {
3, /* iVersion */
sizeof(winFile), /* szOsFile */
SQLITE_WIN32_MAX_PATH_BYTES, /* mxPathname */
0, /* pNext */
"win32-none", /* zName */
&winNolockAppData, /* pAppData */
winOpen, /* xOpen */
winDelete, /* xDelete */
winAccess, /* xAccess */
winFullPathname, /* xFullPathname */
winDlOpen, /* xDlOpen */
winDlError, /* xDlError */
winDlSym, /* xDlSym */
winDlClose, /* xDlClose */
winRandomness, /* xRandomness */
winSleep, /* xSleep */
winCurrentTime, /* xCurrentTime */
winGetLastError, /* xGetLastError */
winCurrentTimeInt64, /* xCurrentTimeInt64 */
winSetSystemCall, /* xSetSystemCall */
winGetSystemCall, /* xGetSystemCall */
winNextSystemCall, /* xNextSystemCall */
};
#if defined(SQLITE_WIN32_HAS_WIDE)
static sqlite3_vfs winLongPathNolockVfs = {
3, /* iVersion */
sizeof(winFile), /* szOsFile */
SQLITE_WINNT_MAX_PATH_BYTES, /* mxPathname */
0, /* pNext */
"win32-longpath-none", /* zName */
&winNolockAppData, /* pAppData */
winOpen, /* xOpen */
winDelete, /* xDelete */
winAccess, /* xAccess */
@@ -5787,6 +5935,12 @@ int sqlite3_os_init(void){
sqlite3_vfs_register(&winLongPathVfs, 0);
#endif
sqlite3_vfs_register(&winNolockVfs, 0);
#if defined(SQLITE_WIN32_HAS_WIDE)
sqlite3_vfs_register(&winLongPathNolockVfs, 0);
#endif
return SQLITE_OK;
}

126
test/win32nolock.test Normal file
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@@ -0,0 +1,126 @@
# 2016 July 8
#
# The author disclaims copyright to this source code. In place of
# a legal notice, here is a blessing:
#
# May you do good and not evil.
# May you find forgiveness for yourself and forgive others.
# May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
if {$tcl_platform(platform)!="windows"} return
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix win32nolock
do_test win32nolock-1.0 {
sqlite3 db test.db
execsql {
CREATE TABLE t1(a, b);
BEGIN;
INSERT INTO t1 VALUES(1, 2);
}
} {}
do_test win32nolock-1.1 {
execsql COMMIT
catchsql { SELECT * FROM t1 }
} {0 {1 2}}
db close
do_test win32nolock-1.2 {
sqlite3 db test.db -vfs win32-none
sqlite3 db2 test.db -vfs win32-none
execsql { PRAGMA mmap_size = 0 } db2
execsql {
BEGIN;
INSERT INTO t1 VALUES(3, 4);
}
} {}
do_test win32nolock-1.3 {
execsql { SELECT * FROM t1 }
} {1 2 3 4}
do_test win32nolock-1.4 {
execsql { SELECT * FROM t1; } db2
} {1 2}
do_test win32nolock-1.5 {
execsql {
BEGIN;
SELECT * FROM t1;
} db2
} {1 2}
do_test win32nolock-1.6 {
execsql COMMIT
execsql {SELECT * FROM t1} db2
} {1 2}
ifcapable memorymanage {
do_test win32nolock-1.7 {
sqlite3_release_memory 1000000
execsql {SELECT * FROM t1} db2
} {1 2 3 4}
}
do_test win32nolock-1.8 {
db close
db2 close
} {}
do_test win32nolock-1.9.1 {
sqlite3 db test.db
sqlite3 db2 test.db
list [catchsql { BEGIN EXCLUSIVE; } db] \
[catchsql { BEGIN EXCLUSIVE; } db2]
} {{0 {}} {1 {database is locked}}}
do_test win32nolock-1.9.2 {
db close
db2 close
} {}
do_test win32nolock-1.10.1 {
sqlite3 db test.db -vfs win32-none
sqlite3 db2 test.db
list [catchsql { BEGIN EXCLUSIVE; } db] \
[catchsql { BEGIN EXCLUSIVE; } db2]
} {{0 {}} {0 {}}}
do_test win32nolock-1.10.2 {
db close
db2 close
} {}
do_test win32nolock-1.11.1 {
sqlite3 db test.db
sqlite3 db2 test.db -vfs win32-none
list [catchsql { BEGIN EXCLUSIVE; } db] \
[catchsql { BEGIN EXCLUSIVE; } db2]
} {{0 {}} {0 {}}}
do_test win32nolock-1.11.2 {
db close
db2 close
} {}
do_test win32nolock-1.12.1 {
sqlite3 db test.db -vfs win32-none
sqlite3 db2 test.db -vfs win32-none
list [catchsql { BEGIN EXCLUSIVE; } db] \
[catchsql { BEGIN EXCLUSIVE; } db2]
} {{0 {}} {0 {}}}
do_test win32nolock-1.12.2 {
db close
db2 close
} {}
finish_test