sqlite3OsCheckReservedLock 9147 ext/sqlite3/libsqlite/sqlite3.c SQLITE_PRIVATE int sqlite3OsCheckReservedLock(sqlite3_file *id, int *pResOut);
sqlite3OsCheckReservedLock 41409 ext/sqlite3/libsqlite/sqlite3.c     rc = sqlite3OsCheckReservedLock(pPager->fd, &locked);