[sql] Import reference version of SQLite 3.10.2.

third_party/sqlite/sqlite-src-3100200/src/wal.h

 /*
 ** 2010 February 1
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
@@ skipping 26 matching lines @@
 # define sqlite3WalUndo(x,y,z)                   0
 # define sqlite3WalSavepoint(y,z)
 # define sqlite3WalSavepointUndo(y,z)            0
 # define sqlite3WalFrames(u,v,w,x,y,z)           0
 # define sqlite3WalCheckpoint(r,s,t,u,v,w,x,y,z) 0
 # define sqlite3WalCallback(z)                   0
 # define sqlite3WalExclusiveMode(y,z)            0
 # define sqlite3WalHeapMemory(z)                 0
 # define sqlite3WalFramesize(z)                  0
 # define sqlite3WalFindFrame(x,y,z)              0
+# define sqlite3WalFile(x)                       0
 #else
 
 #define WAL_SAVEPOINT_NDATA 4
 
 /* Connection to a write-ahead log (WAL) file. 
 ** There is one object of this type for each pager. 
 */
 typedef struct Wal Wal;
 
 /* Open and close a connection to a write-ahead log. */
@@ skipping 62 matching lines @@
 ** by the pager layer on the database file.
 */
 int sqlite3WalExclusiveMode(Wal *pWal, int op);
 
 /* Return true if the argument is non-NULL and the WAL module is using
 ** heap-memory for the wal-index. Otherwise, if the argument is NULL or the
 ** WAL module is using shared-memory, return false. 
 */
 int sqlite3WalHeapMemory(Wal *pWal);
 
+#ifdef SQLITE_ENABLE_SNAPSHOT
+int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot);
+void sqlite3WalSnapshotOpen(Wal *pWal, sqlite3_snapshot *pSnapshot);
+#endif
+
 #ifdef SQLITE_ENABLE_ZIPVFS
 /* If the WAL file is not empty, return the number of bytes of content
 ** stored in each frame (i.e. the db page-size when the WAL was created).
 */
 int sqlite3WalFramesize(Wal *pWal);
 #endif
 
+/* Return the sqlite3_file object for the WAL file */
+sqlite3_file *sqlite3WalFile(Wal *pWal);
+
 #endif /* ifndef SQLITE_OMIT_WAL */
 #endif /* _WAL_H_ */