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Add missing comments associated with readonly shm changes.

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FossilOrigin-Name: 6a2ea52e6c09a570428161090c2f087c66f714ec
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dan
2011-05-11 17:36:17 +00:00
parent 3640db58d0
commit a96a399ec9
5 changed files with 60 additions and 10 deletions
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8
src/wal.c
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@@ -406,6 +406,14 @@ struct WalCkptInfo {
/*
** An open write-ahead log file is represented by an instance of the
** following object.
**
** The readOnlyShm variable is normally set to 0. If it is set to 1, then
** the connection to shared-memory is read-only. This means it cannot
** be written at all (even when read-locking the database). If it is set
** to 2, then the shared-memory region is not yet open, but a read-only
** connection is acceptable. In this case when the shared-memory is opened
** (see function walIndexPage()), readOnlyShm is set to either 0 or 1 as
** appropriate.
*/
struct Wal {
sqlite3_vfs *pVfs; /* The VFS used to create pDbFd */