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Experimental changes that permit read operations to continue after a

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ROLLBACK, as long as the schema is unchanged.

FossilOrigin-Name: fa6e6a9ae276cad60e9a4abc1bc23cf2809ea786
This commit is contained in:
drh
2014-11-11 01:33:57 +00:00
parent de58f4fe7f
commit 47b7fc7843
16 changed files with 95 additions and 66 deletions
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9
src/main.c
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@@ -1111,13 +1111,15 @@ void sqlite3LeaveMutexAndCloseZombie(sqlite3 *db){
/*
** Rollback all database files. If tripCode is not SQLITE_OK, then
** any open cursors are invalidated ("tripped" - as in "tripping a circuit
** any write cursors are invalidated ("tripped" - as in "tripping a circuit
** breaker") and made to return tripCode if there are any further
** attempts to use that cursor.
** attempts to use that cursor. Read cursors remain open and valid
** but are "saved" in case the table pages are moved around.
*/
void sqlite3RollbackAll(sqlite3 *db, int tripCode){
int i;
int inTrans = 0;
int schemaChange;
assert( sqlite3_mutex_held(db->mutex) );
sqlite3BeginBenignMalloc();
@@ -1128,6 +1130,7 @@ void sqlite3RollbackAll(sqlite3 *db, int tripCode){
** the database rollback and schema reset, which can cause false
** corruption reports in some cases. */
sqlite3BtreeEnterAll(db);
schemaChange = (db->flags & SQLITE_InternChanges)!=0 && db->init.busy==0;
for(i=0; i<db->nDb; i++){
Btree *p = db->aDb[i].pBt;
@@ -1135,7 +1138,7 @@ void sqlite3RollbackAll(sqlite3 *db, int tripCode){
if( sqlite3BtreeIsInTrans(p) ){
inTrans = 1;
}
sqlite3BtreeRollback(p, tripCode);
sqlite3BtreeRollback(p, tripCode, !schemaChange);
}
}
sqlite3VtabRollback(db);