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Overview
Comment: | Updates to the VFS SHM locking documentation. |
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Downloads: | Tarball | ZIP archive | SQL archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
9927ce421090ac20285cf05768b38e1f |
User & Date: | drh 2010-05-06 19:04:49 |
Context
2010-05-06
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19:20 | Changes to support SQLITE_OMIT_WAL. check-in: 32a8501d user: shaneh tags: trunk | |
19:04 | Updates to the VFS SHM locking documentation. check-in: 9927ce42 user: drh tags: trunk | |
18:48 | Instead of transitioning to RECOVER state from CHECKPOINT when a recovery is required, perform the recovery while holding the CHECKPOINT lock. check-in: bb0b6021 user: dan tags: trunk | |
Changes
Changes to doc/vfs-shm.txt.
111 112 113 114 115 116 117 118 119 120 121 122 123 |
(11j) READ_FULL RECOVER RECOVER (11k) WRITE READ READ (11l) PENDING UNLOCK UNLOCK (11m) PENDING CHECKPOINT CHECKPOINT (11n) CHECKPOINT UNLOCK UNLOCK (11o) RECOVER READ READ These 17 transitions are all that needs to be supported. The lock manager implementation can assert that fact. The other 25 possible transitions among the 7 locking states will never occur. The rules above are sufficient for correctness. For maximum concurrency, the following additional considerations apply: |
| | < < < |
111 112 113 114 115 116 117 118 119 120 |
(11j) READ_FULL RECOVER RECOVER (11k) WRITE READ READ (11l) PENDING UNLOCK UNLOCK (11m) PENDING CHECKPOINT CHECKPOINT (11n) CHECKPOINT UNLOCK UNLOCK (11o) RECOVER READ READ These 15 transitions are all that needs to be supported. The lock manager implementation can assert that fact. The other 27 possible transitions among the 7 locking states will never occur. |