SQLite

    }
  
    if( rc!=SQLITE_OK ){
      unlockBtreeIfUnused(pBt);
    }
  }while( (rc&0xFF)==SQLITE_BUSY && pBt->inTransaction==TRANS_NONE &&
          btreeInvokeBusyHandler(pBt) );
  sqlite3PagerResetLockTimeout(pBt->pPager);

  if( rc==SQLITE_OK ){
    if( p->inTrans==TRANS_NONE ){
      pBt->nTransaction++;
#ifndef SQLITE_OMIT_SHARED_CACHE
      if( p->sharable ){
        assert( p->lock.pBtree==p && p->lock.iTable==1 );

#else
static int osSetPosixAdvisoryLock(
  int h,                /* The file descriptor on which to take the lock */
  struct flock *pLock,  /* The description of the lock */
  unixFile *pFile       /* Structure holding timeout value */
){
  int rc = osFcntl(h,F_SETLK,pLock);
  while( rc<0 && pFile->iBusyTimeout>0 ){
    /* On systems that support some kind of blocking file lock with a timeout,
    ** make appropriate changes here to invoke that blocking file lock.  On
    ** generic posix, however, there is no such API.  So we simply try the
    ** lock once every millisecond until either the timeout expires, or until
    ** the lock is obtained. */

    usleep(1000);
    rc = osFcntl(h,F_SETLK,pLock);
    pFile->iBusyTimeout--;


  }
  return rc;
}
#endif /* SQLITE_ENABLE_SETLK_TIMEOUT */


/*

}
void sqlite3PagerUnrefPageOne(DbPage *pPg){
  Pager *pPager;
  assert( pPg!=0 );
  assert( pPg->pgno==1 );
  assert( (pPg->flags & PGHDR_MMAP)==0 ); /* Page1 is never memory mapped */
  pPager = pPg->pPager;
  sqlite3PagerResetLockTimeout(pPager);
  sqlite3PcacheRelease(pPg);
  pagerUnlockIfUnused(pPager);
}

/*
** This function is called at the start of every write transaction.
** There must already be a RESERVED or EXCLUSIVE lock on the database 

** with the pager.  This might return NULL if the file has
** not yet been opened.
*/
sqlite3_file *sqlite3PagerFile(Pager *pPager){
  return pPager->fd;
}

#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
/*
** Reset the lock timeout for pager.
*/
void sqlite3PagerResetLockTimeout(Pager *pPager){
  if( isOpen(pPager->fd) ){
    int x = 0;
    sqlite3OsFileControl(pPager->fd, SQLITE_FCNTL_LOCK_TIMEOUT, &x);
  }
}
#endif

/*
** Return the file handle for the journal file (if it exists).
** This will be either the rollback journal or the WAL file.
*/
sqlite3_file *sqlite3PagerJrnlFile(Pager *pPager){
#if SQLITE_OMIT_WAL
  return pPager->jfd;

  if( pPager->pWal ){
    rc = sqlite3WalCheckpoint(pPager->pWal, db, eMode,
        (eMode==SQLITE_CHECKPOINT_PASSIVE ? 0 : pPager->xBusyHandler),
        pPager->pBusyHandlerArg,
        pPager->walSyncFlags, pPager->pageSize, (u8 *)pPager->pTmpSpace,
        pnLog, pnCkpt
    );
    sqlite3PagerResetLockTimeout(pPager);
  }
  return rc;
}

int sqlite3PagerWalCallback(Pager *pPager){
  return sqlite3WalCallback(pPager->pWal);
}

sqlite3_file *sqlite3PagerJrnlFile(Pager*);
const char *sqlite3PagerJournalname(Pager*);
void *sqlite3PagerTempSpace(Pager*);
int sqlite3PagerIsMemdb(Pager*);
void sqlite3PagerCacheStat(Pager *, int, int, int *);
void sqlite3PagerClearCache(Pager*);
int sqlite3SectorSize(sqlite3_file *);
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
void sqlite3PagerResetLockTimeout(Pager *pPager);
#else
# define sqlite3PagerResetLockTimeout(X)
#endif

/* Functions used to truncate the database file. */
void sqlite3PagerTruncateImage(Pager*,Pgno);

void sqlite3PagerRekey(DbPage*, Pgno, u16);

#if defined(SQLITE_HAS_CODEC) && !defined(SQLITE_OMIT_WAL)