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Lock the wal file for all snapshot transactions, even if they would not

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otherwise require this, preventing checkpointers and writers from wrapping the
wal file. This means that if one connection has an open snapshot transaction
it is guaranteed that a second connection can open a transaction on the same
snapshot.

FossilOrigin-Name: b81a31495bd27c1d96f7df653da3502054240cb5acf66b860da7f0f9b422a524
This commit is contained in:
dan
2017-11-28 13:39:41 +00:00
parent 66a1520c73 21f2bafd9b
commit 05573e41a8
4 changed files with 110 additions and 10 deletions
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3
src/wal.c
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@@ -2494,8 +2494,7 @@ static int walTryBeginRead(Wal *pWal, int *pChanged, int useWal, int cnt){
pInfo = walCkptInfo(pWal);
if( !useWal && pInfo->nBackfill==pWal->hdr.mxFrame
#ifdef SQLITE_ENABLE_SNAPSHOT
&& (pWal->pSnapshot==0 || pWal->hdr.mxFrame==0
|| 0==memcmp(&pWal->hdr, pWal->pSnapshot, sizeof(WalIndexHdr)))
&& (pWal->pSnapshot==0 || pWal->hdr.mxFrame==0)
#endif
){
/* The WAL has been completely backfilled (or it is empty).