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Add experimental command "PRAGMA wal_blocking_checkpoint", which uses the busy-handler to block until all readers have finished in order to ensure the next writer will be able to wrap around to the start of the log file.

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FossilOrigin-Name: 7e3fc2c833a5baa08820c499867b6902bdc2ed5a
This commit is contained in:
dan
2010-11-16 18:56:51 +00:00
parent 95aa47b10a
commit a58f26f93f
14 changed files with 256 additions and 67 deletions
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6
src/vdbe.c
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@@ -5216,13 +5216,13 @@ case OP_AggFinal: {
}
#ifndef SQLITE_OMIT_WAL
/* Opcode: Checkpoint P1 * * * *
/* Opcode: Checkpoint P1 P2 * * *
**
** Checkpoint database P1. This is a no-op if P1 is not currently in
** WAL mode.
** WAL mode. If P2 is non-zero, this is a blocking checkpoint.
*/
case OP_Checkpoint: {
rc = sqlite3Checkpoint(db, pOp->p1);
rc = sqlite3Checkpoint(db, pOp->p1, pOp->p2);
break;
};
#endif