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Overview
| Comment: | Experimental changes toward making snapshots serializable. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | serializable-snapshot |
| Files: | files | file ages | folders |
| SHA1: |
b6a81fa1fc1fb78a65894129851a4ec3 |
| User & Date: | drh 2016-11-15 17:37:56.374 |
Context
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2016-11-18
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| 14:38 | Enhance existing snapshot tests to serialize/deserialize snapshots. No new tests. (check-in: 16b9bf9274 user: dan tags: serializable-snapshot) | |
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2016-11-15
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| 17:37 | Experimental changes toward making snapshots serializable. (check-in: b6a81fa1fc user: drh tags: serializable-snapshot) | |
| 04:00 | Change the OP_Last opcode so that it is a no-op if the cursor is already pointing at the end of the b-tree. (check-in: 663473850c user: drh tags: trunk) | |
Changes
Changes to src/sqlite.h.in.
| ︙ | ︙ | |||
8279 8280 8281 8282 8283 8284 8285 | ** the most recent version. ** ** The constructor for this object is [sqlite3_snapshot_get()]. The ** [sqlite3_snapshot_open()] method causes a fresh read transaction to refer ** to an historical snapshot (if possible). The destructor for ** sqlite3_snapshot objects is [sqlite3_snapshot_free()]. */ | | > > | 8279 8280 8281 8282 8283 8284 8285 8286 8287 8288 8289 8290 8291 8292 8293 8294 8295 |
** the most recent version.
**
** The constructor for this object is [sqlite3_snapshot_get()]. The
** [sqlite3_snapshot_open()] method causes a fresh read transaction to refer
** to an historical snapshot (if possible). The destructor for
** sqlite3_snapshot objects is [sqlite3_snapshot_free()].
*/
typedef struct sqlite3_snapshot {
unsigned char hidden[48];
} sqlite3_snapshot;
/*
** CAPI3REF: Record A Database Snapshot
** EXPERIMENTAL
**
** ^The [sqlite3_snapshot_get(D,S,P)] interface attempts to make a
** new [sqlite3_snapshot] object that records the current state of
|
| ︙ | ︙ |
Changes to src/wal.c.
| ︙ | ︙ | |||
3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 |
/* Create a snapshot object. The content of a snapshot is opaque to
** every other subsystem, so the WAL module can put whatever it needs
** in the object.
*/
int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot){
int rc = SQLITE_OK;
WalIndexHdr *pRet;
assert( pWal->readLock>=0 && pWal->writeLock==0 );
pRet = (WalIndexHdr*)sqlite3_malloc(sizeof(WalIndexHdr));
if( pRet==0 ){
rc = SQLITE_NOMEM_BKPT;
}else{
memcpy(pRet, &pWal->hdr, sizeof(WalIndexHdr));
*ppSnapshot = (sqlite3_snapshot*)pRet;
}
| > > > > > | 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 |
/* Create a snapshot object. The content of a snapshot is opaque to
** every other subsystem, so the WAL module can put whatever it needs
** in the object.
*/
int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot){
int rc = SQLITE_OK;
WalIndexHdr *pRet;
static const u32 aZero[4] = { 0, 0, 0, 0 };
assert( pWal->readLock>=0 && pWal->writeLock==0 );
if( memcmp(&pWal->hdr.aFrameCksum[0],aZero,16)==0 ){
*ppSnapshot = 0;
return SQLITE_ERROR;
}
pRet = (WalIndexHdr*)sqlite3_malloc(sizeof(WalIndexHdr));
if( pRet==0 ){
rc = SQLITE_NOMEM_BKPT;
}else{
memcpy(pRet, &pWal->hdr, sizeof(WalIndexHdr));
*ppSnapshot = (sqlite3_snapshot*)pRet;
}
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| ︙ | ︙ |