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Add an implementation mark and fix a comment describing the OP_Checkpoint

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opcode.

FossilOrigin-Name: 7475b90c558157802b036162376fceacc1b9ab4a
This commit is contained in:
drh
2014-12-04 04:50:59 +00:00
parent dd90d7ee81
commit a25165fa68
4 changed files with 14 additions and 12 deletions
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6
src/wal.c
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@@ -1824,8 +1824,10 @@ static int walCheckpoint(
rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(1), WAL_NREADER-1);
if( rc==SQLITE_OK ){
if( eMode==SQLITE_CHECKPOINT_TRUNCATE ){
/* If this is a TRUNCATE checkpoint, also truncate the wal file
** to zero bytes in size on disk.
/* IMPLEMENTATION-OF: R-44699-57140 This mode works the same way as
** SQLITE_CHECKPOINT_RESTART with the addition that it also
** truncates the log file to zero bytes just prior to a
** successful return.
**
** In theory, it might be safe to do this without updating the
** wal-index header in shared memory, as all subsequent reader or