/* If the journal needs to be sync()ed before page pPg->pgno can
  ** be written to, store pPg->pgno in local variable needSyncPgno.
  **
  ** If the isCommit flag is set, there is no need to remember that
  ** the journal needs to be sync()ed before database page pPg->pgno 
  ** can be written to. The caller has already promised not to write to it.
  */
  if( (pPg->flags&PGHDR_NEED_SYNC) && !isCommit /* && pPager->tempFile==0 */ ){
    needSyncPgno = pPg->pgno;
    assert( pPager->journalMode==PAGER_JOURNALMODE_OFF ||
            pageInJournal(pPager, pPg) || pPg->pgno>pPager->dbOrigSize );
    assert( pPg->flags&PGHDR_DIRTY );
  }

  /* If the cache contains a page with page-number pgno, remove it
................................................................................
}

#ifndef SQLITE_OMIT_VACUUM
/*
** Unless this is an in-memory or temporary database, clear the pager cache.
*/
void sqlite3PagerClearCache(Pager *pPager){

  if( !MEMDB && pPager->tempFile==0 ) pager_reset(pPager);
}
#endif

#ifndef SQLITE_OMIT_WAL
/*
** This function is called when the user invokes "PRAGMA wal_checkpoint",
** "PRAGMA wal_blocking_checkpoint" or calls the sqlite3_wal_checkpoint()

  /* If the journal needs to be sync()ed before page pPg->pgno can
  ** be written to, store pPg->pgno in local variable needSyncPgno.
  **
  ** If the isCommit flag is set, there is no need to remember that
  ** the journal needs to be sync()ed before database page pPg->pgno 
  ** can be written to. The caller has already promised not to write to it.
  */
  if( (pPg->flags&PGHDR_NEED_SYNC) && !isCommit ){
    needSyncPgno = pPg->pgno;
    assert( pPager->journalMode==PAGER_JOURNALMODE_OFF ||
            pageInJournal(pPager, pPg) || pPg->pgno>pPager->dbOrigSize );
    assert( pPg->flags&PGHDR_DIRTY );
  }

  /* If the cache contains a page with page-number pgno, remove it
................................................................................
}

#ifndef SQLITE_OMIT_VACUUM
/*
** Unless this is an in-memory or temporary database, clear the pager cache.
*/
void sqlite3PagerClearCache(Pager *pPager){
  assert( MEMDB==0 || pPager->tempFile );
  if( pPager->tempFile==0 ) pager_reset(pPager);
}
#endif

#ifndef SQLITE_OMIT_WAL
/*
** This function is called when the user invokes "PRAGMA wal_checkpoint",
** "PRAGMA wal_blocking_checkpoint" or calls the sqlite3_wal_checkpoint()

# At one point the following set of conditions would cause SQLite to 
# retain a RESERVED or EXCLUSIVE lock after the transaction was committed:
# 
#   * The journal-mode is set to something other than 'delete', and
#   * there exists one or more active read-only statements, and
#   * a transaction that modified zero database pages is committed.
# 
set temp_status unlocked
if {$TEMP_STORE>=2} {set temp_status unknown}

do_test lock-7.1 {
  set STMT [sqlite3_prepare $DB "SELECT * FROM sqlite_master" -1 TAIL]
  sqlite3_step $STMT
} {SQLITE_ROW}
do_test lock-7.2 {
  execsql { PRAGMA lock_status }
} [list main shared temp $temp_status]

# At one point the following set of conditions would cause SQLite to 
# retain a RESERVED or EXCLUSIVE lock after the transaction was committed:
# 
#   * The journal-mode is set to something other than 'delete', and
#   * there exists one or more active read-only statements, and
#   * a transaction that modified zero database pages is committed.
# 
#set temp_status unlocked
#if {$TEMP_STORE>=2} {set temp_status unknown}
set temp_status unknown
do_test lock-7.1 {
  set STMT [sqlite3_prepare $DB "SELECT * FROM sqlite_master" -1 TAIL]
  sqlite3_step $STMT
} {SQLITE_ROW}
do_test lock-7.2 {
  execsql { PRAGMA lock_status }
} [list main shared temp $temp_status]