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Overview
| Comment: | Fix a typo in a comment in wal.c. No code changes. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | d854a3d41c68f785c909c159cd9ca215 |
| User & Date: | drh 2010-08-16 16:31:44 |
Context
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2010-08-16
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| 18:26 | Add test cases designed to exercise all syntax diagram paths in lang_expr.html check-in: d4a26bb6 user: dan tags: trunk | |
| 16:31 | Fix a typo in a comment in wal.c. No code changes. check-in: d854a3d4 user: drh tags: trunk | |
| 14:18 | Add ALWAYS() macros in wal.c to cover branches that are no longer reachable following the pager refactoring. check-in: 24f24c92 user: drh tags: trunk | |
Changes
Changes to src/wal.c.
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u32 aCksum[2]; /* Checksum on the header content */ WalIndexHdr h1, h2; /* Two copies of the header content */ WalIndexHdr volatile *aHdr; /* Header in shared memory */ /* The first page of the wal-index must be mapped at this point. */ assert( pWal->nWiData>0 && pWal->apWiData[0] ); /* Read the header. This might happen currently with a write to the ** same area of shared memory on a different CPU in a SMP, ** meaning it is possible that an inconsistent snapshot is read ** from the file. If this happens, return non-zero. ** ** There are two copies of the header at the beginning of the wal-index. ** When reading, read [0] first then [1]. Writes are in the reverse order. ** Memory barriers are used to prevent the compiler or the hardware from |
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1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 |
u32 aCksum[2]; /* Checksum on the header content */
WalIndexHdr h1, h2; /* Two copies of the header content */
WalIndexHdr volatile *aHdr; /* Header in shared memory */
/* The first page of the wal-index must be mapped at this point. */
assert( pWal->nWiData>0 && pWal->apWiData[0] );
/* Read the header. This might happen concurrently with a write to the
** same area of shared memory on a different CPU in a SMP,
** meaning it is possible that an inconsistent snapshot is read
** from the file. If this happens, return non-zero.
**
** There are two copies of the header at the beginning of the wal-index.
** When reading, read [0] first then [1]. Writes are in the reverse order.
** Memory barriers are used to prevent the compiler or the hardware from
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