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Overview
| Comment: | Make sure that the constant 1 is cast to yDbType before shifting to create an attached database mask. This check-in is a follow-up and fix to the [7aaf8772274422] change that increases the maximum number of attached databases from 30 to 62. |
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| SHA1: |
e2a09ea73c76a0bec1e09d1fc1109251 |
| User & Date: | drh 2011-04-03 18:19:25 |
Context
|
2011-04-04
| ||
| 00:14 | Remove the BtreeMutexArray object - use the Vdbe.btreeMask field to accomplish the same result. Add a generation counter to btree mutexes in order to assert that mutexes are never temporarily dropped over a range of instructions in order to do deadlock avoidance in some subroutine. Lock all btrees in any Vdbe program that uses OP_ParseSchema. check-in: d81708f7 user: drh tags: trunk | |
|
2011-04-03
| ||
| 18:19 | Make sure that the constant 1 is cast to yDbType before shifting to create an attached database mask. This check-in is a follow-up and fix to the [7aaf8772274422] change that increases the maximum number of attached databases from 30 to 62. check-in: e2a09ea7 user: drh tags: trunk | |
| 02:41 | Fix typos in comments. No changes to code. check-in: 28c5f12e user: drh tags: trunk | |
Changes
Changes to src/vdbe.c.
2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 .... 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 .... 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 .... 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 .... 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 .... 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 .... 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 .... 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 .... 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 .... 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 .... 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 .... 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 |
**
** If P2 is zero, then a read-lock is obtained on the database file.
*/
case OP_Transaction: {
Btree *pBt;
assert( pOp->p1>=0 && pOp->p1<db->nDb );
assert( (p->btreeMask & (1<<pOp->p1))!=0 );
pBt = db->aDb[pOp->p1].pBt;
if( pBt ){
rc = sqlite3BtreeBeginTrans(pBt, pOp->p2);
if( rc==SQLITE_BUSY ){
p->pc = pc;
p->rc = rc = SQLITE_BUSY;
................................................................................
int iCookie;
iDb = pOp->p1;
iCookie = pOp->p3;
assert( pOp->p3<SQLITE_N_BTREE_META );
assert( iDb>=0 && iDb<db->nDb );
assert( db->aDb[iDb].pBt!=0 );
assert( (p->btreeMask & (1<<iDb))!=0 );
sqlite3BtreeGetMeta(db->aDb[iDb].pBt, iCookie, (u32 *)&iMeta);
pOut->u.i = iMeta;
break;
}
/* Opcode: SetCookie P1 P2 P3 * *
................................................................................
**
** A transaction must be started before executing this opcode.
*/
case OP_SetCookie: { /* in3 */
Db *pDb;
assert( pOp->p2<SQLITE_N_BTREE_META );
assert( pOp->p1>=0 && pOp->p1<db->nDb );
assert( (p->btreeMask & (1<<pOp->p1))!=0 );
pDb = &db->aDb[pOp->p1];
assert( pDb->pBt!=0 );
pIn3 = &aMem[pOp->p3];
sqlite3VdbeMemIntegerify(pIn3);
/* See note about index shifting on OP_ReadCookie */
rc = sqlite3BtreeUpdateMeta(pDb->pBt, pOp->p2, (int)pIn3->u.i);
if( pOp->p2==BTREE_SCHEMA_VERSION ){
................................................................................
*/
case OP_VerifyCookie: {
int iMeta;
int iGen;
Btree *pBt;
assert( pOp->p1>=0 && pOp->p1<db->nDb );
assert( (p->btreeMask & (1<<pOp->p1))!=0 );
pBt = db->aDb[pOp->p1].pBt;
if( pBt ){
sqlite3BtreeGetMeta(pBt, BTREE_SCHEMA_VERSION, (u32 *)&iMeta);
iGen = db->aDb[pOp->p1].pSchema->iGeneration;
}else{
iMeta = 0;
}
................................................................................
}
nField = 0;
pKeyInfo = 0;
p2 = pOp->p2;
iDb = pOp->p3;
assert( iDb>=0 && iDb<db->nDb );
assert( (p->btreeMask & (1<<iDb))!=0 );
pDb = &db->aDb[iDb];
pX = pDb->pBt;
assert( pX!=0 );
if( pOp->opcode==OP_OpenWrite ){
wrFlag = 1;
if( pDb->pSchema->file_format < p->minWriteFileFormat ){
p->minWriteFileFormat = pDb->pSchema->file_format;
................................................................................
pOut->flags = MEM_Null;
if( iCnt>1 ){
rc = SQLITE_LOCKED;
p->errorAction = OE_Abort;
}else{
iDb = pOp->p3;
assert( iCnt==1 );
assert( (p->btreeMask & (1<<iDb))!=0 );
rc = sqlite3BtreeDropTable(db->aDb[iDb].pBt, pOp->p1, &iMoved);
pOut->flags = MEM_Int;
pOut->u.i = iMoved;
#ifndef SQLITE_OMIT_AUTOVACUUM
if( rc==SQLITE_OK && iMoved!=0 ){
sqlite3RootPageMoved(&db->aDb[iDb], iMoved, pOp->p1);
resetSchemaOnFault = 1;
................................................................................
**
** See also: Destroy
*/
case OP_Clear: {
int nChange;
nChange = 0;
assert( (p->btreeMask & (1<<pOp->p2))!=0 );
rc = sqlite3BtreeClearTable(
db->aDb[pOp->p2].pBt, pOp->p1, (pOp->p3 ? &nChange : 0)
);
if( pOp->p3 ){
p->nChange += nChange;
if( pOp->p3>0 ){
assert( memIsValid(&aMem[pOp->p3]) );
................................................................................
case OP_CreateTable: { /* out2-prerelease */
int pgno;
int flags;
Db *pDb;
pgno = 0;
assert( pOp->p1>=0 && pOp->p1<db->nDb );
assert( (p->btreeMask & (1<<pOp->p1))!=0 );
pDb = &db->aDb[pOp->p1];
assert( pDb->pBt!=0 );
if( pOp->opcode==OP_CreateTable ){
/* flags = BTREE_INTKEY; */
flags = BTREE_INTKEY;
}else{
flags = BTREE_BLOBKEY;
................................................................................
assert( (pnErr->flags & (MEM_Str|MEM_Blob))==0 );
pIn1 = &aMem[pOp->p1];
for(j=0; j<nRoot; j++){
aRoot[j] = (int)sqlite3VdbeIntValue(&pIn1[j]);
}
aRoot[j] = 0;
assert( pOp->p5<db->nDb );
assert( (p->btreeMask & (1<<pOp->p5))!=0 );
z = sqlite3BtreeIntegrityCheck(db->aDb[pOp->p5].pBt, aRoot, nRoot,
(int)pnErr->u.i, &nErr);
sqlite3DbFree(db, aRoot);
pnErr->u.i -= nErr;
sqlite3VdbeMemSetNull(pIn1);
if( nErr==0 ){
assert( z==0 );
................................................................................
** is not called when the statement is prepared because it requires the
** iDb index of the database as a parameter, and the database has not
** yet been attached so that index is unavailable. We have to wait
** until runtime (now) to get the mutex on the newly attached database.
** No other mutexes are required by the ATTACH command so this is safe
** to do.
*/
assert( (p->btreeMask & (1<<pOp->p1))!=0 || p->aMutex.nMutex==0 );
if( p->aMutex.nMutex==0 ){
/* This occurs right after ATTACH. Get a mutex on the newly ATTACHed
** database. */
sqlite3VdbeUsesBtree(p, pOp->p1);
sqlite3VdbeMutexArrayEnter(p);
}
................................................................................
** the P1 database. If the vacuum has finished, jump to instruction
** P2. Otherwise, fall through to the next instruction.
*/
case OP_IncrVacuum: { /* jump */
Btree *pBt;
assert( pOp->p1>=0 && pOp->p1<db->nDb );
assert( (p->btreeMask & (1<<pOp->p1))!=0 );
pBt = db->aDb[pOp->p1].pBt;
rc = sqlite3BtreeIncrVacuum(pBt);
if( rc==SQLITE_DONE ){
pc = pOp->p2 - 1;
rc = SQLITE_OK;
}
break;
................................................................................
** used to generate an error message if the lock cannot be obtained.
*/
case OP_TableLock: {
u8 isWriteLock = (u8)pOp->p3;
if( isWriteLock || 0==(db->flags&SQLITE_ReadUncommitted) ){
int p1 = pOp->p1;
assert( p1>=0 && p1<db->nDb );
assert( (p->btreeMask & (1<<p1))!=0 );
assert( isWriteLock==0 || isWriteLock==1 );
rc = sqlite3BtreeLockTable(db->aDb[p1].pBt, pOp->p2, isWriteLock);
if( (rc&0xFF)==SQLITE_LOCKED ){
const char *z = pOp->p4.z;
sqlite3SetString(&p->zErrMsg, db, "database table is locked: %s", z);
}
}
|
| | | | | | | | | | | | |
2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 .... 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 .... 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 .... 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 .... 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 .... 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 .... 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 .... 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 .... 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 .... 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 .... 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 .... 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 |
**
** If P2 is zero, then a read-lock is obtained on the database file.
*/
case OP_Transaction: {
Btree *pBt;
assert( pOp->p1>=0 && pOp->p1<db->nDb );
assert( (p->btreeMask & (((yDbMask)1)<<pOp->p1))!=0 );
pBt = db->aDb[pOp->p1].pBt;
if( pBt ){
rc = sqlite3BtreeBeginTrans(pBt, pOp->p2);
if( rc==SQLITE_BUSY ){
p->pc = pc;
p->rc = rc = SQLITE_BUSY;
................................................................................
int iCookie;
iDb = pOp->p1;
iCookie = pOp->p3;
assert( pOp->p3<SQLITE_N_BTREE_META );
assert( iDb>=0 && iDb<db->nDb );
assert( db->aDb[iDb].pBt!=0 );
assert( (p->btreeMask & (((yDbMask)1)<<iDb))!=0 );
sqlite3BtreeGetMeta(db->aDb[iDb].pBt, iCookie, (u32 *)&iMeta);
pOut->u.i = iMeta;
break;
}
/* Opcode: SetCookie P1 P2 P3 * *
................................................................................
**
** A transaction must be started before executing this opcode.
*/
case OP_SetCookie: { /* in3 */
Db *pDb;
assert( pOp->p2<SQLITE_N_BTREE_META );
assert( pOp->p1>=0 && pOp->p1<db->nDb );
assert( (p->btreeMask & (((yDbMask)1)<<pOp->p1))!=0 );
pDb = &db->aDb[pOp->p1];
assert( pDb->pBt!=0 );
pIn3 = &aMem[pOp->p3];
sqlite3VdbeMemIntegerify(pIn3);
/* See note about index shifting on OP_ReadCookie */
rc = sqlite3BtreeUpdateMeta(pDb->pBt, pOp->p2, (int)pIn3->u.i);
if( pOp->p2==BTREE_SCHEMA_VERSION ){
................................................................................
*/
case OP_VerifyCookie: {
int iMeta;
int iGen;
Btree *pBt;
assert( pOp->p1>=0 && pOp->p1<db->nDb );
assert( (p->btreeMask & (((yDbMask)1)<<pOp->p1))!=0 );
pBt = db->aDb[pOp->p1].pBt;
if( pBt ){
sqlite3BtreeGetMeta(pBt, BTREE_SCHEMA_VERSION, (u32 *)&iMeta);
iGen = db->aDb[pOp->p1].pSchema->iGeneration;
}else{
iMeta = 0;
}
................................................................................
}
nField = 0;
pKeyInfo = 0;
p2 = pOp->p2;
iDb = pOp->p3;
assert( iDb>=0 && iDb<db->nDb );
assert( (p->btreeMask & (((yDbMask)1)<<iDb))!=0 );
pDb = &db->aDb[iDb];
pX = pDb->pBt;
assert( pX!=0 );
if( pOp->opcode==OP_OpenWrite ){
wrFlag = 1;
if( pDb->pSchema->file_format < p->minWriteFileFormat ){
p->minWriteFileFormat = pDb->pSchema->file_format;
................................................................................
pOut->flags = MEM_Null;
if( iCnt>1 ){
rc = SQLITE_LOCKED;
p->errorAction = OE_Abort;
}else{
iDb = pOp->p3;
assert( iCnt==1 );
assert( (p->btreeMask & (((yDbMask)1)<<iDb))!=0 );
rc = sqlite3BtreeDropTable(db->aDb[iDb].pBt, pOp->p1, &iMoved);
pOut->flags = MEM_Int;
pOut->u.i = iMoved;
#ifndef SQLITE_OMIT_AUTOVACUUM
if( rc==SQLITE_OK && iMoved!=0 ){
sqlite3RootPageMoved(&db->aDb[iDb], iMoved, pOp->p1);
resetSchemaOnFault = 1;
................................................................................
**
** See also: Destroy
*/
case OP_Clear: {
int nChange;
nChange = 0;
assert( (p->btreeMask & (((yDbMask)1)<<pOp->p2))!=0 );
rc = sqlite3BtreeClearTable(
db->aDb[pOp->p2].pBt, pOp->p1, (pOp->p3 ? &nChange : 0)
);
if( pOp->p3 ){
p->nChange += nChange;
if( pOp->p3>0 ){
assert( memIsValid(&aMem[pOp->p3]) );
................................................................................
case OP_CreateTable: { /* out2-prerelease */
int pgno;
int flags;
Db *pDb;
pgno = 0;
assert( pOp->p1>=0 && pOp->p1<db->nDb );
assert( (p->btreeMask & (((yDbMask)1)<<pOp->p1))!=0 );
pDb = &db->aDb[pOp->p1];
assert( pDb->pBt!=0 );
if( pOp->opcode==OP_CreateTable ){
/* flags = BTREE_INTKEY; */
flags = BTREE_INTKEY;
}else{
flags = BTREE_BLOBKEY;
................................................................................
assert( (pnErr->flags & (MEM_Str|MEM_Blob))==0 );
pIn1 = &aMem[pOp->p1];
for(j=0; j<nRoot; j++){
aRoot[j] = (int)sqlite3VdbeIntValue(&pIn1[j]);
}
aRoot[j] = 0;
assert( pOp->p5<db->nDb );
assert( (p->btreeMask & (((yDbMask)1)<<pOp->p5))!=0 );
z = sqlite3BtreeIntegrityCheck(db->aDb[pOp->p5].pBt, aRoot, nRoot,
(int)pnErr->u.i, &nErr);
sqlite3DbFree(db, aRoot);
pnErr->u.i -= nErr;
sqlite3VdbeMemSetNull(pIn1);
if( nErr==0 ){
assert( z==0 );
................................................................................
** is not called when the statement is prepared because it requires the
** iDb index of the database as a parameter, and the database has not
** yet been attached so that index is unavailable. We have to wait
** until runtime (now) to get the mutex on the newly attached database.
** No other mutexes are required by the ATTACH command so this is safe
** to do.
*/
assert( (p->btreeMask & (((yDbMask)1)<<pOp->p1))!=0 || p->aMutex.nMutex==0 );
if( p->aMutex.nMutex==0 ){
/* This occurs right after ATTACH. Get a mutex on the newly ATTACHed
** database. */
sqlite3VdbeUsesBtree(p, pOp->p1);
sqlite3VdbeMutexArrayEnter(p);
}
................................................................................
** the P1 database. If the vacuum has finished, jump to instruction
** P2. Otherwise, fall through to the next instruction.
*/
case OP_IncrVacuum: { /* jump */
Btree *pBt;
assert( pOp->p1>=0 && pOp->p1<db->nDb );
assert( (p->btreeMask & (((yDbMask)1)<<pOp->p1))!=0 );
pBt = db->aDb[pOp->p1].pBt;
rc = sqlite3BtreeIncrVacuum(pBt);
if( rc==SQLITE_DONE ){
pc = pOp->p2 - 1;
rc = SQLITE_OK;
}
break;
................................................................................
** used to generate an error message if the lock cannot be obtained.
*/
case OP_TableLock: {
u8 isWriteLock = (u8)pOp->p3;
if( isWriteLock || 0==(db->flags&SQLITE_ReadUncommitted) ){
int p1 = pOp->p1;
assert( p1>=0 && p1<db->nDb );
assert( (p->btreeMask & (((yDbMask)1)<<p1))!=0 );
assert( isWriteLock==0 || isWriteLock==1 );
rc = sqlite3BtreeLockTable(db->aDb[p1].pBt, pOp->p2, isWriteLock);
if( (rc&0xFF)==SQLITE_LOCKED ){
const char *z = pOp->p4.z;
sqlite3SetString(&p->zErrMsg, db, "database table is locked: %s", z);
}
}
|
Changes to src/vdbeaux.c.
950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 |
** order (via sqlite3VdbeMutexArrayEnter(). Mutexes are acquired
** in order (and released in reverse order) to avoid deadlocks.
*/
void sqlite3VdbeUsesBtree(Vdbe *p, int i){
yDbMask mask;
assert( i>=0 && i<p->db->nDb && i<sizeof(yDbMask)*8 );
assert( i<(int)sizeof(p->btreeMask)*8 );
mask = ((u32)1)<<i;
if( (p->btreeMask & mask)==0 ){
p->btreeMask |= mask;
sqlite3BtreeMutexArrayInsert(&p->aMutex, p->db->aDb[i].pBt);
}
}
|
| |
950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 |
** order (via sqlite3VdbeMutexArrayEnter(). Mutexes are acquired
** in order (and released in reverse order) to avoid deadlocks.
*/
void sqlite3VdbeUsesBtree(Vdbe *p, int i){
yDbMask mask;
assert( i>=0 && i<p->db->nDb && i<sizeof(yDbMask)*8 );
assert( i<(int)sizeof(p->btreeMask)*8 );
mask = ((yDbMask)1)<<i;
if( (p->btreeMask & mask)==0 ){
p->btreeMask |= mask;
sqlite3BtreeMutexArrayInsert(&p->aMutex, p->db->aDb[i].pBt);
}
}
|