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Overview
| Comment: | Improvements to a comment in the pcache.c file. No changes to code. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
b369980f0c4550a9034833caa2c7c85d |
| User & Date: | drh 2016-05-13 17:22:33 |
Context
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2016-05-16
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| 11:55 | Disable shell.exe test cases for UTF8 filenames as they do not work on MinGW. (check-in: 386bcbba user: drh tags: trunk) | |
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2016-05-13
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| 17:22 | Improvements to a comment in the pcache.c file. No changes to code. (check-in: b369980f user: drh tags: trunk) | |
| 15:22 | Remove the unused PGHDR_NEED_READ flag. Add invariant checking (during SQLITE_DEBUG builds only) for the PgHdr object. (check-in: 771c5411 user: drh tags: trunk) | |
Changes
Changes to src/pcache.c.
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** (1) Page X is journalled, and gets WRITEABLE and NEED_SEEK. ** (2) Page X moved to freelist, WRITEABLE is cleared ** (3) Page X reused, WRITEABLE is set again ** If NEED_SYNC had been cleared in step 2, then it would not be reset ** in step 3, and page might be written into the database without first ** syncing the rollback journal, which might cause corruption on a power ** loss. */ return 1; } #endif /* SQLITE_DEBUG */ /********************************** Linked List Management ********************/ |
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125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 |
** (1) Page X is journalled, and gets WRITEABLE and NEED_SEEK. ** (2) Page X moved to freelist, WRITEABLE is cleared ** (3) Page X reused, WRITEABLE is set again ** If NEED_SYNC had been cleared in step 2, then it would not be reset ** in step 3, and page might be written into the database without first ** syncing the rollback journal, which might cause corruption on a power ** loss. ** ** Another example is when the database page size is smaller than the ** disk sector size. When any page of a sector is journalled, all pages ** in that sector are marked NEED_SYNC even if they are still CLEAN, just ** in case they are later modified, since all pages in the same sector ** must be journalled and synced before any of those pages can be safely ** written. */ return 1; } #endif /* SQLITE_DEBUG */ /********************************** Linked List Management ********************/ |