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Simpler fix for the race condition also fixed by [7c102c7b5f]

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FossilOrigin-Name: 3c2de820034e01c2e939bd90a05a58159f60df50
This commit is contained in:
dan
2010-06-09 11:28:43 +00:00
parent e4bddc1fab
commit 15651f61df
3 changed files with 9 additions and 8 deletions
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3
src/wal.c
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@@ -1780,7 +1780,7 @@ static int walTryBeginRead(Wal *pWal, int *pChanged, int useWal, int cnt){
mxI = 0;
for(i=1; i<WAL_NREADER; i++){
u32 thisMark = pInfo->aReadMark[i];
if( mxReadMark<thisMark ){
if( mxReadMark<thisMark && thisMark<=(pWal->hdr.mxFrame+1) ){
mxReadMark = thisMark;
mxI = i;
}
@@ -1845,6 +1845,7 @@ static int walTryBeginRead(Wal *pWal, int *pChanged, int useWal, int cnt){
walUnlockShared(pWal, WAL_READ_LOCK(mxI));
return WAL_RETRY;
}else{
assert( mxReadMark<=(pWal->hdr.mxFrame+1) );
pWal->readLock = mxI;
}
}