database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-08-05 15:55:57 +03:00
Code Activity

Clarify an assert in sqlite3WalExclusiveMode().

Browse Source 
FossilOrigin-Name: 255850699ddbf4aad8cc3223aefbada35daa0703
This commit is contained in:
dan
2010-06-04 18:37:59 +00:00
parent 0153a9bc04
commit 3cac5dc9bc
4 changed files with 68 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
src/wal.c
View File

@@ -2448,14 +2448,20 @@ int sqlite3WalCallback(Wal *pWal){
int sqlite3WalExclusiveMode(Wal *pWal, int op){
int rc;
assert( pWal->writeLock==0 );
/* pWal->readLock is usually set, but might be -1 if there was a prior OOM */
/* pWal->readLock is usually set, but might be -1 if there was a
** prior error while attempting to acquire are read-lock. This cannot
** happen if the connection is actually in exclusive mode (as no xShmLock
** locks are taken in this case). Nor should the pager attempt to
** upgrade to exclusive-mode following such an error.
*/
assert( pWal->readLock>=0 || pWal->lockError );
assert( pWal->readLock>=0 || (op<=0 && pWal->exclusiveMode==0) );
if( op==0 ){
if( pWal->exclusiveMode ){
pWal->exclusiveMode = 0;
if( pWal->readLock>=0
&& walLockShared(pWal, WAL_READ_LOCK(pWal->readLock))!=SQLITE_OK
){
if( walLockShared(pWal, WAL_READ_LOCK(pWal->readLock))!=SQLITE_OK ){
pWal->exclusiveMode = 1;
}
rc = pWal->exclusiveMode==0;