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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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10
src/pager.c
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@@ -6516,13 +6516,19 @@ sqlite3_backup **sqlite3PagerBackupPtr(Pager *pPager){
#ifndef SQLITE_OMIT_WAL
/*
** This function is called when the user invokes "PRAGMA checkpoint".
** This function is called when the user invokes "PRAGMA wal_checkpoint",
** "PRAGMA wal_blocking_checkpoint" or calls the sqlite3_wal_checkpoint()
** or wal_blocking_checkpoint() API functions.
**
** Parameter bBlock is true for a blocking-checkpoint, false for an
** ordinary, non-blocking, checkpoint.
*/
int sqlite3PagerCheckpoint(Pager *pPager){
int sqlite3PagerCheckpoint(Pager *pPager, int bBlock){
int rc = SQLITE_OK;
if( pPager->pWal ){
u8 *zBuf = (u8 *)pPager->pTmpSpace;
rc = sqlite3WalCheckpoint(pPager->pWal,
(bBlock ? pPager->xBusyHandler : 0), pPager->pBusyHandlerArg,
(pPager->noSync ? 0 : pPager->sync_flags),
pPager->pageSize, zBuf
);