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Overview
| Comment: | In wal mode, if a "BEGIN EXCLUSIVE" command (or any other command that upgrades from no transaction directly to a write transaction) hits an SQLITE_BUSY_SNAPSHOT error, change the error code to SQLITE_BUSY to indicate to the caller that the condition may be transient. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | exp-busy-snapshot-fix |
| Files: | files | file ages | folders |
| SHA3-256: |
221ff63e7902226ebf728bb744272742 |
| User & Date: | dan 2018-07-05 15:46:55 |
Context
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2018-07-05
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| 17:03 | Fix a typo inside an assert() statement introduced by the previous commit. (Closed-Leaf check-in: e3357728 user: dan tags: exp-busy-snapshot-fix) | |
| 15:46 | In wal mode, if a "BEGIN EXCLUSIVE" command (or any other command that upgrades from no transaction directly to a write transaction) hits an SQLITE_BUSY_SNAPSHOT error, change the error code to SQLITE_BUSY to indicate to the caller that the condition may be transient. (check-in: 221ff63e user: dan tags: exp-busy-snapshot-fix) | |
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2018-07-03
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| 20:17 | Test that a race condition can cause a "BEGIN EXCLUSIVE" to return SQLITE_BUSY_SNAPSHOT in wal mode. (check-in: 5a12db75 user: dan tags: trunk) | |
Changes
Changes to src/btree.c.
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if( pBt->nPage!=get4byte(&pPage1->aData[28]) ){
rc = sqlite3PagerWrite(pPage1->pDbPage);
if( rc==SQLITE_OK ){
put4byte(&pPage1->aData[28], pBt->nPage);
}
}
}
}
trans_begun:
if( rc==SQLITE_OK ){
if( pSchemaVersion ){
*pSchemaVersion = get4byte(&pBt->pPage1->aData[40]);
|
> > > > > > > > |
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if( pBt->nPage!=get4byte(&pPage1->aData[28]) ){
rc = sqlite3PagerWrite(pPage1->pDbPage);
if( rc==SQLITE_OK ){
put4byte(&pPage1->aData[28], pBt->nPage);
}
}
}
}else if( rc==SQLITE_BUSY_SNAPSHOT && pBt->inTransaction==TRANS_NONE ){
/* Even if there was no transaction opened when this function was
** called, a race condition may cause an SQLITE_BUSY_SNAPSHOT error
** in wal mode (since the code above opens a read-transaction and then
** upgrades it to a write-transaction - it does not take the write lock
** atomically). In this case change the error code to SQLITE_BUSY. */
assert( wrFlag );
rc = SQLITE_BUSY;
}
trans_begun:
if( rc==SQLITE_OK ){
if( pSchemaVersion ){
*pSchemaVersion = get4byte(&pBt->pPage1->aData[40]);
|
Changes to test/walprotocol2.test.
68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 |
}
}
do_catchsql_test 2.2 {
BEGIN EXCLUSIVE;
} {1 {database is locked}}
do_test 2.3 {
sqlite3_extended_errcode db
} {SQLITE_BUSY_SNAPSHOT}
#---------------------------------------------------------------
# Same again, but with a busy-handler. This time, following the
# SQLITE_BUSY_SNAPSHOT error the busy-handler is invoked and then the
# whole thing retried from the beginning. This time it succeeds.
#
proc lock_callback {method filename handle lock} {
|
| |
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}
}
do_catchsql_test 2.2 {
BEGIN EXCLUSIVE;
} {1 {database is locked}}
do_test 2.3 {
sqlite3_extended_errcode db
} {SQLITE_BUSY}
#---------------------------------------------------------------
# Same again, but with a busy-handler. This time, following the
# SQLITE_BUSY_SNAPSHOT error the busy-handler is invoked and then the
# whole thing retried from the beginning. This time it succeeds.
#
proc lock_callback {method filename handle lock} {
|