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Overview
| Comment: | When walTryBeginRead() encounters an I/O error trying to set a lock (as opposed to SQLITE_BUSY) be sure to propagate that error back up the call stack. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
aa2c2b67a7f50c97a44cca1af5c437bf |
| User & Date: | drh 2010-06-02 15:43:19 |
Context
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2010-06-02
| ||
| 15:59 | Make sure the directory used by os_unix.c for shared-memory files is always the same, regardless of individual client permissions and environment variable settings. check-in: f97bd520 user: drh tags: trunk | |
| 15:43 | When walTryBeginRead() encounters an I/O error trying to set a lock (as opposed to SQLITE_BUSY) be sure to propagate that error back up the call stack. check-in: aa2c2b67 user: drh tags: trunk | |
| 14:45 | Changes to make WAL more robust against SHM locking failures and OOM errors. check-in: ebf40413 user: drh tags: trunk | |
Changes
Changes to src/wal.c.
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** 1 and WAL_NREADER-1 are zero. Try to initialize aReadMark[1] to
** be mxFrame, then retry.
*/
rc = walLockExclusive(pWal, WAL_READ_LOCK(1), 1);
if( rc==SQLITE_OK ){
pInfo->aReadMark[1] = pWal->hdr.mxFrame+1;
walUnlockExclusive(pWal, WAL_READ_LOCK(1), 1);
}
return WAL_RETRY;
}else{
if( mxReadMark < pWal->hdr.mxFrame ){
for(i=1; i<WAL_NREADER; i++){
rc = walLockExclusive(pWal, WAL_READ_LOCK(i), 1);
if( rc==SQLITE_OK ){
mxReadMark = pInfo->aReadMark[i] = pWal->hdr.mxFrame+1;
mxI = i;
walUnlockExclusive(pWal, WAL_READ_LOCK(i), 1);
break;
}
}
}
rc = walLockShared(pWal, WAL_READ_LOCK(mxI));
if( rc ){
return rc==SQLITE_BUSY ? WAL_RETRY : rc;
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> > > | > > |
1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 |
** 1 and WAL_NREADER-1 are zero. Try to initialize aReadMark[1] to
** be mxFrame, then retry.
*/
rc = walLockExclusive(pWal, WAL_READ_LOCK(1), 1);
if( rc==SQLITE_OK ){
pInfo->aReadMark[1] = pWal->hdr.mxFrame+1;
walUnlockExclusive(pWal, WAL_READ_LOCK(1), 1);
rc = WAL_RETRY;
}else if( rc==SQLITE_BUSY ){
rc = WAL_RETRY;
}
return rc;
}else{
if( mxReadMark < pWal->hdr.mxFrame ){
for(i=1; i<WAL_NREADER; i++){
rc = walLockExclusive(pWal, WAL_READ_LOCK(i), 1);
if( rc==SQLITE_OK ){
mxReadMark = pInfo->aReadMark[i] = pWal->hdr.mxFrame+1;
mxI = i;
walUnlockExclusive(pWal, WAL_READ_LOCK(i), 1);
break;
}else if( rc!=SQLITE_BUSY ){
return rc;
}
}
}
rc = walLockShared(pWal, WAL_READ_LOCK(mxI));
if( rc ){
return rc==SQLITE_BUSY ? WAL_RETRY : rc;
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