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If a database file with the WAL flag set is opened in exclusive-locking mode, use heap memory to store the wal-index instead of shared-memory.

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FossilOrigin-Name: 8dd5c69198619866923c6053b71899c1fb8c4c67
This commit is contained in:
dan
2010-11-01 17:38:24 +00:00
parent b6e321c09a
commit 8c40800439
12 changed files with 366 additions and 62 deletions
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9
src/wal.h
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@@ -35,6 +35,7 @@
# define sqlite3WalCheckpoint(u,v,w,x) 0
# define sqlite3WalCallback(z) 0
# define sqlite3WalExclusiveMode(y,z) 0
# define sqlite3WalHeapMemory(z) 0
#else
#define WAL_SAVEPOINT_NDATA 4
@@ -45,7 +46,7 @@
typedef struct Wal Wal;
/* Open and close a connection to a write-ahead log. */
int sqlite3WalOpen(sqlite3_vfs*, sqlite3_file*, const char *zName, Wal**);
int sqlite3WalOpen(sqlite3_vfs*, sqlite3_file*, const char *zName, int, Wal**);
int sqlite3WalClose(Wal *pWal, int sync_flags, int, u8 *);
/* Used by readers to open (lock) and close (unlock) a snapshot. A
@@ -102,5 +103,11 @@ int sqlite3WalCallback(Wal *pWal);
*/
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);
#endif /* ifndef SQLITE_OMIT_WAL */
#endif /* _WAL_H_ */