mirror of https://github.com/sqlite/sqlite
56 lines
1.6 KiB
Plaintext
56 lines
1.6 KiB
Plaintext
unlocked -> read
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1. If the journal file exists
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A. Open the journal file for exclusive access
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i) return SQLITE_BUSY
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B. Get a write lock on the database
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i) close the journal file
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ii) return SQLITE_PROTOCOL_ERROR
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C. playback the journal
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D. close and delete the journal file
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E. drop the write lock on the database
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2. Get a read lock on the database file.
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A. return SQLITE_BUSY
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3. return SQLITE_OK
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read -> unlocked
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1. Drop the read lock on the database file
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2. Invalidate all pages in the cache
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3. return SQLITE_OK
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read -> write
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1. Create the journal file and open for exclusive access
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A. return SQLITE_BUSY
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2. Drop the read lock on the database
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3. Get a write lock on the database
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A. Get a read lock on the database
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i) return SQLITE_PROTOCOL_ERROR
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B. Delete the journal
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C. return SQLITE_BUSY
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4. return SQLITE_OK
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write -> read (commit)
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1. Sync the journal
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2. Write all dirty pages
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A. playback journal
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B. Reload or invalidate all pages in cache
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3. Sync the database
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4. Drop the write lock on the database
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5. Get a read lock on the database
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A. return SQLITE_PROTOCOL_ERROR
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6. Delete the journal
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7. return SQLITE_OK
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write -> read (rollback)
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1. Playback the journal
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2. Drop the write lock on the database
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3. Get a read lock on the database
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A. return SQLITE_PROTOCOL_ERROR
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4. Delete the journal
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5. Reload or invalidate all pages in cache
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6. SQLITE_FULL
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