return rc;
}

/*
** An sqlite3_exec() callback for fts3TableExists.
*/
static int fts3TableExistsCallback(void *pArg, int n, char **pp1, char **pp2){



  *(int*)pArg = 1;
  return 1;
}

/*
** Determine if a table currently exists in the database.
*/
................................................................................
  if( *pRc ) return;
  zSql = sqlite3_mprintf(
    "SELECT 1 FROM %Q.sqlite_master WHERE name='%q%s'",
    zDb, zName, zSuffix
  );    
  rc = sqlite3_exec(db, zSql, fts3TableExistsCallback, &res, 0);
  sqlite3_free(zSql);
  *pResult = res & 0xff;
  if( rc!=SQLITE_ABORT ) *pRc = rc;
}

/*
** This function is the implementation of both the xConnect and xCreate
** methods of the FTS3 virtual table.
**

  return rc;
}

/*
** An sqlite3_exec() callback for fts3TableExists.
*/
static int fts3TableExistsCallback(void *pArg, int n, char **pp1, char **pp2){
  UNUSED_PARAMETER(n);
  UNUSED_PARAMETER(pp1);
  UNUSED_PARAMETER(pp2);
  *(int*)pArg = 1;
  return 1;
}

/*
** Determine if a table currently exists in the database.
*/
................................................................................
  if( *pRc ) return;
  zSql = sqlite3_mprintf(
    "SELECT 1 FROM %Q.sqlite_master WHERE name='%q%s'",
    zDb, zName, zSuffix
  );    
  rc = sqlite3_exec(db, zSql, fts3TableExistsCallback, &res, 0);
  sqlite3_free(zSql);
  *pResult = (u8)(res & 0xff);
  if( rc!=SQLITE_ABORT ) *pRc = rc;
}

/*
** This function is the implementation of both the xConnect and xCreate
** methods of the FTS3 virtual table.
**

  /* Any read-only or read-write transaction implies a read-lock on 
  ** page 1. So if some other shared-cache client already has a write-lock 
  ** on page 1, the transaction cannot be opened. */
  rc = querySharedCacheTableLock(p, MASTER_ROOT, READ_LOCK);
  if( SQLITE_OK!=rc ) goto trans_begun;

  pBt->initiallyEmpty = pBt->nPage==0;
  do {
    /* Call lockBtree() until either pBt->pPage1 is populated or
    ** lockBtree() returns something other than SQLITE_OK. lockBtree()
    ** may return SQLITE_OK but leave pBt->pPage1 set to 0 if after
    ** reading page 1 it discovers that the page-size of the database 
    ** file is not pBt->pageSize. In this case lockBtree() will update
    ** pBt->pageSize to the page-size of the file on disk.
................................................................................
  assert( cursorHoldsMutex(pCur) );
  assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
  rc = moveToRoot(pCur);
  if( rc==SQLITE_OK ){
    if( pCur->eState==CURSOR_INVALID ){
      assert( pCur->apPage[pCur->iPage]->nCell==0 );
      *pRes = 1;
      rc = SQLITE_OK;
    }else{
      assert( pCur->apPage[pCur->iPage]->nCell>0 );
      *pRes = 0;
      rc = moveToLeftmost(pCur);
    }
  }
  return rc;
................................................................................
 
  assert( pBtree->inTrans==TRANS_NONE );
  assert( iVersion==1 || iVersion==2 );

  /* If setting the version fields to 1, do not automatically open the
  ** WAL connection, even if the version fields are currently set to 2.
  */
  pBt->doNotUseWAL = (iVersion==1);

  rc = sqlite3BtreeBeginTrans(pBtree, 0);
  if( rc==SQLITE_OK ){
    u8 *aData = pBt->pPage1->aData;
    if( aData[18]!=(u8)iVersion || aData[19]!=(u8)iVersion ){
      rc = sqlite3BtreeBeginTrans(pBtree, 2);
      if( rc==SQLITE_OK ){

  /* Any read-only or read-write transaction implies a read-lock on 
  ** page 1. So if some other shared-cache client already has a write-lock 
  ** on page 1, the transaction cannot be opened. */
  rc = querySharedCacheTableLock(p, MASTER_ROOT, READ_LOCK);
  if( SQLITE_OK!=rc ) goto trans_begun;

  pBt->initiallyEmpty = (u8)(pBt->nPage==0);
  do {
    /* Call lockBtree() until either pBt->pPage1 is populated or
    ** lockBtree() returns something other than SQLITE_OK. lockBtree()
    ** may return SQLITE_OK but leave pBt->pPage1 set to 0 if after
    ** reading page 1 it discovers that the page-size of the database 
    ** file is not pBt->pageSize. In this case lockBtree() will update
    ** pBt->pageSize to the page-size of the file on disk.
................................................................................
  assert( cursorHoldsMutex(pCur) );
  assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
  rc = moveToRoot(pCur);
  if( rc==SQLITE_OK ){
    if( pCur->eState==CURSOR_INVALID ){
      assert( pCur->apPage[pCur->iPage]->nCell==0 );
      *pRes = 1;

    }else{
      assert( pCur->apPage[pCur->iPage]->nCell>0 );
      *pRes = 0;
      rc = moveToLeftmost(pCur);
    }
  }
  return rc;
................................................................................
 
  assert( pBtree->inTrans==TRANS_NONE );
  assert( iVersion==1 || iVersion==2 );

  /* If setting the version fields to 1, do not automatically open the
  ** WAL connection, even if the version fields are currently set to 2.
  */
  pBt->doNotUseWAL = (u8)(iVersion==1);

  rc = sqlite3BtreeBeginTrans(pBtree, 0);
  if( rc==SQLITE_OK ){
    u8 *aData = pBt->pPage1->aData;
    if( aData[18]!=(u8)iVersion || aData[19]!=(u8)iVersion ){
      rc = sqlite3BtreeBeginTrans(pBtree, 2);
      if( rc==SQLITE_OK ){

**     sqlite3OsOpen()
**     sqlite3OsRead()
**     sqlite3OsWrite()
**     sqlite3OsSync()
**     sqlite3OsLock()
**
*/
#if defined(SQLITE_TEST) && (SQLITE_OS_WIN==0)
int sqlite3_memdebug_vfs_oom_test = 1;
  #define DO_OS_MALLOC_TEST(x)                                       \
  if (sqlite3_memdebug_vfs_oom_test && (!x || !sqlite3IsMemJournal(x))) {  \
    void *pTstAlloc = sqlite3Malloc(10);                             \
    if (!pTstAlloc) return SQLITE_IOERR_NOMEM;                       \
    sqlite3_free(pTstAlloc);                                         \
  }

**     sqlite3OsOpen()
**     sqlite3OsRead()
**     sqlite3OsWrite()
**     sqlite3OsSync()
**     sqlite3OsLock()
**
*/
#if defined(SQLITE_TEST)
int sqlite3_memdebug_vfs_oom_test = 1;
  #define DO_OS_MALLOC_TEST(x)                                       \
  if (sqlite3_memdebug_vfs_oom_test && (!x || !sqlite3IsMemJournal(x))) {  \
    void *pTstAlloc = sqlite3Malloc(10);                             \
    if (!pTstAlloc) return SQLITE_IOERR_NOMEM;                       \
    sqlite3_free(pTstAlloc);                                         \
  }

  if( lPath[len-1]!='/' ){
    len = strlcat(lPath, "/", maxLen);
  }
  
  /* transform the db path to a unique cache name */
  dbLen = (int)strlen(dbPath);
  for( i=0; i<dbLen && (i+len+7)<maxLen; i++){
    char c = dbPath[i];
    lPath[i+len] = (c=='/')?'_':c;
  }
  lPath[i+len]='\0';
  strlcat(lPath, ":auto:", maxLen);
  OSTRACE(("GETLOCKPATH  proxy lock path=%s pid=%d\n", lPath, getpid()));
  return SQLITE_OK;
................................................................................
#ifdef SQLITE_TEST
/* simulate multiple hosts by creating unique hostid file paths */
int sqlite3_hostid_num = 0;
#endif

#define PROXY_HOSTIDLEN    16  /* conch file host id length */




/* get the host ID via gethostuuid(), pHostID must point to PROXY_HOSTIDLEN 
** bytes of writable memory.
*/
static int proxyGetHostID(unsigned char *pHostID, int *pError){
  struct timespec timeout = {1, 0}; /* 1 sec timeout */
  
  assert(PROXY_HOSTIDLEN == sizeof(uuid_t));
................................................................................
  char buf[PROXY_MAXCONCHLEN];
  char *cPath = pCtx->conchFilePath;
  size_t readLen = 0;
  size_t pathLen = 0;
  char errmsg[64] = "";
  int fd = -1;
  int rc = -1;


  /* create a new path by replace the trailing '-conch' with '-break' */
  pathLen = strlcpy(tPath, cPath, MAXPATHLEN);
  if( pathLen>MAXPATHLEN || pathLen<6 || 
     (strlcpy(&tPath[pathLen-5], "break", 6) != 5) ){
    sprintf(errmsg, "path error (len %d)", (int)pathLen);
    goto end_breaklock;
................................................................................
  }
  /* write it out to the temporary break file */
  fd = open(tPath, (O_RDWR|O_CREAT|O_EXCL), SQLITE_DEFAULT_FILE_PERMISSIONS);
  if( fd<0 ){
    sprintf(errmsg, "create failed (%d)", errno);
    goto end_breaklock;
  }
  if( pwrite(fd, buf, readLen, 0) != readLen ){
    sprintf(errmsg, "write failed (%d)", errno);
    goto end_breaklock;
  }
  if( rename(tPath, cPath) ){
    sprintf(errmsg, "rename failed (%d)", errno);
    goto end_breaklock;
  }

  if( lPath[len-1]!='/' ){
    len = strlcat(lPath, "/", maxLen);
  }
  
  /* transform the db path to a unique cache name */
  dbLen = (int)strlen(dbPath);
  for( i=0; i<dbLen && (i+len+7)<(int)maxLen; i++){
    char c = dbPath[i];
    lPath[i+len] = (c=='/')?'_':c;
  }
  lPath[i+len]='\0';
  strlcat(lPath, ":auto:", maxLen);
  OSTRACE(("GETLOCKPATH  proxy lock path=%s pid=%d\n", lPath, getpid()));
  return SQLITE_OK;
................................................................................
#ifdef SQLITE_TEST
/* simulate multiple hosts by creating unique hostid file paths */
int sqlite3_hostid_num = 0;
#endif

#define PROXY_HOSTIDLEN    16  /* conch file host id length */

/* Not always defined in the headers as it ought to be */
extern int gethostuuid(uuid_t id, const struct timespec *wait);

/* get the host ID via gethostuuid(), pHostID must point to PROXY_HOSTIDLEN 
** bytes of writable memory.
*/
static int proxyGetHostID(unsigned char *pHostID, int *pError){
  struct timespec timeout = {1, 0}; /* 1 sec timeout */
  
  assert(PROXY_HOSTIDLEN == sizeof(uuid_t));
................................................................................
  char buf[PROXY_MAXCONCHLEN];
  char *cPath = pCtx->conchFilePath;
  size_t readLen = 0;
  size_t pathLen = 0;
  char errmsg[64] = "";
  int fd = -1;
  int rc = -1;
  UNUSED_PARAMETER(myHostID);

  /* create a new path by replace the trailing '-conch' with '-break' */
  pathLen = strlcpy(tPath, cPath, MAXPATHLEN);
  if( pathLen>MAXPATHLEN || pathLen<6 || 
     (strlcpy(&tPath[pathLen-5], "break", 6) != 5) ){
    sprintf(errmsg, "path error (len %d)", (int)pathLen);
    goto end_breaklock;
................................................................................
  }
  /* write it out to the temporary break file */
  fd = open(tPath, (O_RDWR|O_CREAT|O_EXCL), SQLITE_DEFAULT_FILE_PERMISSIONS);
  if( fd<0 ){
    sprintf(errmsg, "create failed (%d)", errno);
    goto end_breaklock;
  }
  if( pwrite(fd, buf, readLen, 0) != (ssize_t)readLen ){
    sprintf(errmsg, "write failed (%d)", errno);
    goto end_breaklock;
  }
  if( rename(tPath, cPath) ){
    sprintf(errmsg, "rename failed (%d)", errno);
    goto end_breaklock;
  }

    }

    /* Check to see if another process is holding the dead-man switch.
    ** If not, truncate the file to zero length. 
    */
    if( winShmSystemLock(pShmNode, _SHM_WRLCK, WIN_SHM_DMS, 1)==SQLITE_OK ){
      rc = winTruncate((sqlite3_file *)&pShmNode->hFile, 0);



    }
    if( rc==SQLITE_OK ){
      winShmSystemLock(pShmNode, _SHM_UNLCK, WIN_SHM_DMS, 1);
      rc = winShmSystemLock(pShmNode, _SHM_RDLCK, WIN_SHM_DMS, 1);
    }
    if( rc ) goto shm_open_err;
  }
................................................................................
**
** All loads and stores begun before the barrier must complete before
** any load or store begun after the barrier.
*/
static void winShmBarrier(
  sqlite3_file *fd          /* Database holding the shared memory */
){

  /* MemoryBarrier(); // does not work -- do not know why not */
  winShmEnterMutex();
  winShmLeaveMutex();
}

#else
# define winShmOpen    0

    }

    /* Check to see if another process is holding the dead-man switch.
    ** If not, truncate the file to zero length. 
    */
    if( winShmSystemLock(pShmNode, _SHM_WRLCK, WIN_SHM_DMS, 1)==SQLITE_OK ){
      rc = winTruncate((sqlite3_file *)&pShmNode->hFile, 0);
      if( rc!=SQLITE_OK ){
        rc = SQLITE_IOERR_SHMOPEN;
      }
    }
    if( rc==SQLITE_OK ){
      winShmSystemLock(pShmNode, _SHM_UNLCK, WIN_SHM_DMS, 1);
      rc = winShmSystemLock(pShmNode, _SHM_RDLCK, WIN_SHM_DMS, 1);
    }
    if( rc ) goto shm_open_err;
  }
................................................................................
**
** All loads and stores begun before the barrier must complete before
** any load or store begun after the barrier.
*/
static void winShmBarrier(
  sqlite3_file *fd          /* Database holding the shared memory */
){
  UNUSED_PARAMETER(fd);
  /* MemoryBarrier(); // does not work -- do not know why not */
  winShmEnterMutex();
  winShmLeaveMutex();
}

#else
# define winShmOpen    0

int sqlite3PagerMaxPageCount(Pager *pPager, int mxPage){
  int nPage;
  if( mxPage>0 ){
    pPager->mxPgno = mxPage;
  }
  if( pPager->state!=PAGER_UNLOCK ){
    sqlite3PagerPagecount(pPager, &nPage);
    assert( pPager->mxPgno>=nPage );
  }
  return pPager->mxPgno;
}

/*
** The following set of routines are used to disable the simulated
** I/O error mechanism.  These routines are used to avoid simulated
................................................................................
  return pPager->noSync;
}

#ifdef SQLITE_HAS_CODEC
/*
** Set or retrieve the codec for this pager
*/
static void sqlite3PagerSetCodec(
  Pager *pPager,
  void *(*xCodec)(void*,void*,Pgno,int),
  void (*xCodecSizeChng)(void*,int,int),
  void (*xCodecFree)(void*),
  void *pCodec
){
  if( pPager->xCodecFree ) pPager->xCodecFree(pPager->pCodec);
  pPager->xCodec = pPager->memDb ? 0 : xCodec;
  pPager->xCodecSizeChng = xCodecSizeChng;
  pPager->xCodecFree = xCodecFree;
  pPager->pCodec = pCodec;
  pagerReportSize(pPager);
}
static void *sqlite3PagerGetCodec(Pager *pPager){
  return pPager->pCodec;
}
#endif

#ifndef SQLITE_OMIT_AUTOVACUUM
/*
** Move the page pPg to location pgno in the file.
................................................................................
*/
int sqlite3PagerWalSupported(Pager *pPager){
  const sqlite3_io_methods *pMethods = pPager->fd->pMethods;
  return pMethods->iVersion>=2 && pMethods->xShmOpen!=0;
}

/*
** Open a connection to the write-ahead log file for pager pPager. If
** the log connection is already open, this function is a no-op.
**
** The caller must be holding a SHARED lock on the database file to call
** this function.











*/
int sqlite3PagerOpenWal(Pager *pPager, int *pisOpen){



  int rc = SQLITE_OK;             /* Return code */

  assert( pPager->state>=PAGER_SHARED );


  if( !pPager->pWal ){
    if( !sqlite3PagerWalSupported(pPager) ) return SQLITE_CANTOPEN;

    /* Open the connection to the log file. If this operation fails, 
    ** (e.g. due to malloc() failure), unlock the database file and 
    ** return an error code.
    */
    rc = sqlite3WalOpen(pPager->pVfs, pPager->fd,

int sqlite3PagerMaxPageCount(Pager *pPager, int mxPage){
  int nPage;
  if( mxPage>0 ){
    pPager->mxPgno = mxPage;
  }
  if( pPager->state!=PAGER_UNLOCK ){
    sqlite3PagerPagecount(pPager, &nPage);
    assert( (int)pPager->mxPgno>=nPage );
  }
  return pPager->mxPgno;
}

/*
** The following set of routines are used to disable the simulated
** I/O error mechanism.  These routines are used to avoid simulated
................................................................................
  return pPager->noSync;
}

#ifdef SQLITE_HAS_CODEC
/*
** Set or retrieve the codec for this pager
*/
void sqlite3PagerSetCodec(
  Pager *pPager,
  void *(*xCodec)(void*,void*,Pgno,int),
  void (*xCodecSizeChng)(void*,int,int),
  void (*xCodecFree)(void*),
  void *pCodec
){
  if( pPager->xCodecFree ) pPager->xCodecFree(pPager->pCodec);
  pPager->xCodec = pPager->memDb ? 0 : xCodec;
  pPager->xCodecSizeChng = xCodecSizeChng;
  pPager->xCodecFree = xCodecFree;
  pPager->pCodec = pCodec;
  pagerReportSize(pPager);
}
void *sqlite3PagerGetCodec(Pager *pPager){
  return pPager->pCodec;
}
#endif

#ifndef SQLITE_OMIT_AUTOVACUUM
/*
** Move the page pPg to location pgno in the file.
................................................................................
*/
int sqlite3PagerWalSupported(Pager *pPager){
  const sqlite3_io_methods *pMethods = pPager->fd->pMethods;
  return pMethods->iVersion>=2 && pMethods->xShmOpen!=0;
}

/*



** The caller must be holding a SHARED lock on the database file to call
** this function.
**
** If the pager passed as the first argument is open on a real database
** file (not a temp file or an in-memory database), and the WAL file
** is not already open, make an attempt to open it now. If successful,
** return SQLITE_OK. If an error occurs or the VFS used by the pager does 
** not support the xShmXXX() methods, return an error code. *pisOpen is
** not modified in either case.
**
** If the pager is open on a temp-file (or in-memory database), or if
** the WAL file is already open, set *pisOpen to 1 and return SQLITE_OK
** without doing anything.
*/
int sqlite3PagerOpenWal(
  Pager *pPager,                  /* Pager object */
  int *pisOpen                    /* OUT: Set to true if call is a no-op */
){
  int rc = SQLITE_OK;             /* Return code */

  assert( pPager->state>=PAGER_SHARED );
  assert( (pisOpen==0 && !pPager->tempFile && !pPager->pWal) || *pisOpen==0 );

  if( !pPager->tempFile && !pPager->pWal ){
    if( !sqlite3PagerWalSupported(pPager) ) return SQLITE_CANTOPEN;

    /* Open the connection to the log file. If this operation fails, 
    ** (e.g. due to malloc() failure), unlock the database file and 
    ** return an error code.
    */
    rc = sqlite3WalOpen(pPager->pVfs, pPager->fd,

    );
    tvfsResultCode(p, &rc);
  }

  for(ppFd=&pBuffer->pFile; *ppFd!=pFd; ppFd=&((*ppFd)->pNext));
  assert( (*ppFd)==pFd );
  *ppFd = pFd->pNext;


  if( pBuffer->pFile==0 ){
    int i;
    TestvfsBuffer **pp;
    for(pp=&p->pBuffer; *pp!=pBuffer; pp=&((*pp)->pNext));
    *pp = (*pp)->pNext;
    for(i=0; pBuffer->aPage[i]; i++){

    );
    tvfsResultCode(p, &rc);
  }

  for(ppFd=&pBuffer->pFile; *ppFd!=pFd; ppFd=&((*ppFd)->pNext));
  assert( (*ppFd)==pFd );
  *ppFd = pFd->pNext;
  pFd->pNext = 0;

  if( pBuffer->pFile==0 ){
    int i;
    TestvfsBuffer **pp;
    for(pp=&p->pBuffer; *pp!=pBuffer; pp=&((*pp)->pNext));
    *pp = (*pp)->pNext;
    for(i=0; pBuffer->aPage[i]; i++){

  VdbeCursor *pC;
  BtCursor *pCrsr;
  int res;

  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  assert( pC!=0 );

  if( (pCrsr = pC->pCursor)!=0 ){
    rc = sqlite3BtreeFirst(pCrsr, &res);
    pC->atFirst = res==0 ?1:0;
    pC->deferredMoveto = 0;
    pC->cacheStatus = CACHE_STALE;
    pC->rowidIsValid = 0;
  }else{
    res = 1;
  }
  pC->nullRow = (u8)res;
  assert( pOp->p2>0 && pOp->p2<p->nOp );
  if( res ){
    pc = pOp->p2 - 1;
  }
  break;
................................................................................
*/
case OP_Checkpoint: {
  rc = sqlite3Checkpoint(db, pOp->p1);
  break;
};  
#endif


/* Opcode: JournalMode P1 P2 P3 * P5
**
** Change the journal mode of database P1 to P3. P3 must be one of the
** PAGER_JOURNALMODE_XXX values. If changing between the various rollback
** modes (delete, truncate, persist, off and memory), this is a simple
** operation. No IO is required.
**
................................................................................
  pOut->flags = MEM_Str|MEM_Static|MEM_Term;
  pOut->z = (char *)sqlite3JournalModename(eNew);
  pOut->n = sqlite3Strlen30(pOut->z);
  pOut->enc = SQLITE_UTF8;
  sqlite3VdbeChangeEncoding(pOut, encoding);
  break;
};  


#if !defined(SQLITE_OMIT_VACUUM) && !defined(SQLITE_OMIT_ATTACH)
/* Opcode: Vacuum * * * * *
**
** Vacuum the entire database.  This opcode will cause other virtual
** machines to be created and run.  It may not be called from within
** a transaction.

  VdbeCursor *pC;
  BtCursor *pCrsr;
  int res;

  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  assert( pC!=0 );
  res = 1;
  if( (pCrsr = pC->pCursor)!=0 ){
    rc = sqlite3BtreeFirst(pCrsr, &res);
    pC->atFirst = res==0 ?1:0;
    pC->deferredMoveto = 0;
    pC->cacheStatus = CACHE_STALE;
    pC->rowidIsValid = 0;


  }
  pC->nullRow = (u8)res;
  assert( pOp->p2>0 && pOp->p2<p->nOp );
  if( res ){
    pc = pOp->p2 - 1;
  }
  break;
................................................................................
*/
case OP_Checkpoint: {
  rc = sqlite3Checkpoint(db, pOp->p1);
  break;
};  
#endif

#ifndef SQLITE_OMIT_PRAGMA
/* Opcode: JournalMode P1 P2 P3 * P5
**
** Change the journal mode of database P1 to P3. P3 must be one of the
** PAGER_JOURNALMODE_XXX values. If changing between the various rollback
** modes (delete, truncate, persist, off and memory), this is a simple
** operation. No IO is required.
**
................................................................................
  pOut->flags = MEM_Str|MEM_Static|MEM_Term;
  pOut->z = (char *)sqlite3JournalModename(eNew);
  pOut->n = sqlite3Strlen30(pOut->z);
  pOut->enc = SQLITE_UTF8;
  sqlite3VdbeChangeEncoding(pOut, encoding);
  break;
};
#endif /* SQLITE_OMIT_PRAGMA */

#if !defined(SQLITE_OMIT_VACUUM) && !defined(SQLITE_OMIT_ATTACH)
/* Opcode: Vacuum * * * * *
**
** Vacuum the entire database.  This opcode will cause other virtual
** machines to be created and run.  It may not be called from within
** a transaction.

** an OP_Trace instruction is always inserted by sqlite3VdbeGet() as soon as
** a new VDBE is created.  So we are free to set addr to p->nOp-1 without
** having to double-check to make sure that the result is non-negative. But
** if SQLITE_OMIT_TRACE is defined, the OP_Trace is omitted and we do need to
** check the value of p->nOp-1 before continuing.
*/
VdbeOp *sqlite3VdbeGetOp(Vdbe *p, int addr){


  static const VdbeOp dummy;
  assert( p->magic==VDBE_MAGIC_INIT );
  if( addr<0 ){
#ifdef SQLITE_OMIT_TRACE
    if( p->nOp==0 ) return (VdbeOp*)&dummy;
#endif
    addr = p->nOp - 1;
  }

** an OP_Trace instruction is always inserted by sqlite3VdbeGet() as soon as
** a new VDBE is created.  So we are free to set addr to p->nOp-1 without
** having to double-check to make sure that the result is non-negative. But
** if SQLITE_OMIT_TRACE is defined, the OP_Trace is omitted and we do need to
** check the value of p->nOp-1 before continuing.
*/
VdbeOp *sqlite3VdbeGetOp(Vdbe *p, int addr){
  /* C89 specifies that the constant "dummy" will be initialized to all
  ** zeros, which is correct.  MSVC generates a warning, nevertheless. */
  static const VdbeOp dummy;  /* Ignore the MSVC warning about no initializer */
  assert( p->magic==VDBE_MAGIC_INIT );
  if( addr<0 ){
#ifdef SQLITE_OMIT_TRACE
    if( p->nOp==0 ) return (VdbeOp*)&dummy;
#endif
    addr = p->nOp - 1;
  }

static int walIndexPage(Wal *pWal, int iPage, volatile u32 **ppPage){
  int rc = SQLITE_OK;

  /* Enlarge the pWal->apWiData[] array if required */
  if( pWal->nWiData<=iPage ){
    int nByte = sizeof(u32 *)*(iPage+1);
    volatile u32 **apNew;
    apNew = (volatile u32 **)sqlite3_realloc(pWal->apWiData, nByte);
    if( !apNew ){
      *ppPage = 0;
      return SQLITE_NOMEM;
    }
    memset(&apNew[pWal->nWiData], 0, sizeof(u32 *)*(iPage+1-pWal->nWiData));
    pWal->apWiData = apNew;
    pWal->nWiData = iPage+1;
  }

  /* Request a pointer to the required page from the VFS */
  if( pWal->apWiData[iPage]==0 ){
    rc = sqlite3OsShmMap(pWal->pDbFd, iPage, WALINDEX_PGSZ, 
................................................................................
static int walLockShared(Wal *pWal, int lockIdx){
  int rc;
  if( pWal->exclusiveMode ) return SQLITE_OK;
  rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
                        SQLITE_SHM_LOCK | SQLITE_SHM_SHARED);
  WALTRACE(("WAL%p: acquire SHARED-%s %s\n", pWal,
            walLockName(lockIdx), rc ? "failed" : "ok"));
  VVA_ONLY( pWal->lockError = (rc!=SQLITE_OK && rc!=SQLITE_BUSY); )
  return rc;
}
static void walUnlockShared(Wal *pWal, int lockIdx){
  if( pWal->exclusiveMode ) return;
  (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
                         SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED);
  WALTRACE(("WAL%p: release SHARED-%s\n", pWal, walLockName(lockIdx)));
................................................................................
static int walLockExclusive(Wal *pWal, int lockIdx, int n){
  int rc;
  if( pWal->exclusiveMode ) return SQLITE_OK;
  rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
                        SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE);
  WALTRACE(("WAL%p: acquire EXCLUSIVE-%s cnt=%d %s\n", pWal,
            walLockName(lockIdx), n, rc ? "failed" : "ok"));
  VVA_ONLY( pWal->lockError = (rc!=SQLITE_OK && rc!=SQLITE_BUSY); )
  return rc;
}
static void walUnlockExclusive(Wal *pWal, int lockIdx, int n){
  if( pWal->exclusiveMode ) return;
  (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
                         SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE);
  WALTRACE(("WAL%p: release EXCLUSIVE-%s cnt=%d\n", pWal,
................................................................................
      aHash[i] = 0;
    }
  }
  
  /* Zero the entries in the aPgno array that correspond to frames with
  ** frame numbers greater than pWal->hdr.mxFrame. 
  */
  nByte = ((char *)aHash - (char *)&aPgno[iLimit+1]);
  memset((void *)&aPgno[iLimit+1], 0, nByte);

#ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
  /* Verify that the every entry in the mapping region is still reachable
  ** via the hash table even after the cleanup.
  */
  if( iLimit ){
................................................................................
    idx = iFrame - iZero;
    assert( idx <= HASHTABLE_NSLOT/2 + 1 );
    
    /* If this is the first entry to be added to this hash-table, zero the
    ** entire hash table and aPgno[] array before proceding. 
    */
    if( idx==1 ){
      int nByte = (u8 *)&aHash[HASHTABLE_NSLOT] - (u8 *)&aPgno[1];
      memset((void*)&aPgno[1], 0, nByte);
    }

    /* If the entry in aPgno[] is already set, then the previous writer
    ** must have exited unexpectedly in the middle of a transaction (after
    ** writing one or more dirty pages to the WAL to free up memory). 
    ** Remove the remnants of that writers uncommitted transaction from 
................................................................................
    }

    /* Write the aPgno[] array entry and the hash-table slot. */
    for(iKey=walHash(iPage); aHash[iKey]; iKey=walNextHash(iKey)){
      assert( nCollide++ < idx );
    }
    aPgno[idx] = iPage;
    aHash[iKey] = idx;

#ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
    /* Verify that the number of entries in the hash table exactly equals
    ** the number of entries in the mapping region.
    */
    {
      int i;           /* Loop counter */
................................................................................
    if( (magic&0xFFFFFFFE)!=WAL_MAGIC 
     || szPage&(szPage-1) 
     || szPage>SQLITE_MAX_PAGE_SIZE 
     || szPage<512 
    ){
      goto finished;
    }
    pWal->hdr.bigEndCksum = (magic&0x00000001);
    pWal->szPage = szPage;
    pWal->nCkpt = sqlite3Get4byte(&aBuf[12]);
    memcpy(&pWal->hdr.aSalt, &aBuf[16], 8);

    /* Verify that the WAL header checksum is correct */
    walChecksumBytes(pWal->hdr.bigEndCksum==SQLITE_BIGENDIAN, 
        aBuf, WAL_HDRSIZE-2*4, 0, pWal->hdr.aFrameCksum
    );
................................................................................
      rc = walIndexAppend(pWal, ++iFrame, pgno);
      if( rc!=SQLITE_OK ) break;

      /* If nTruncate is non-zero, this is a commit record. */
      if( nTruncate ){
        pWal->hdr.mxFrame = iFrame;
        pWal->hdr.nPage = nTruncate;
        pWal->hdr.szPage = szPage;
        aFrameCksum[0] = pWal->hdr.aFrameCksum[0];
        aFrameCksum[1] = pWal->hdr.aFrameCksum[1];
      }
    }

    sqlite3_free(aFrame);
  }
................................................................................
    rc = walHashGet(pWal, i, &aHash, &aPgno, &iZero);
    if( rc==SQLITE_OK ){
      int j;                      /* Counter variable */
      int nEntry;                 /* Number of entries in this segment */
      ht_slot *aIndex;            /* Sorted index for this segment */

      aPgno++;
      nEntry = ((i+1)==nSegment)?(int)(iLast-iZero):(u32 *)aHash-(u32 *)aPgno;
      aIndex = &((ht_slot *)&p->aSegment[p->nSegment])[iZero];
      iZero++;
  
      for(j=0; j<nEntry; j++){
        aIndex[j] = j;
      }
      walMergesort((u32 *)aPgno, aTmp, aIndex, &nEntry);
      p->aSegment[i].iZero = iZero;
      p->aSegment[i].nEntry = nEntry;
      p->aSegment[i].aIndex = aIndex;
      p->aSegment[i].aPgno = (u32 *)aPgno;
    }
................................................................................

    walIndexClose(pWal, isDelete);
    sqlite3OsClose(pWal->pWalFd);
    if( isDelete ){
      sqlite3OsDelete(pWal->pVfs, pWal->zWalName, 0);
    }
    WALTRACE(("WAL%p: closed\n", pWal));
    sqlite3_free(pWal->apWiData);
    sqlite3_free(pWal);
  }
  return rc;
}

/*
** Try to read the wal-index header.  Return 0 on success and 1 if
................................................................................
    if( pInfo->aReadMark[mxI]!=mxReadMark
     || memcmp((void *)walIndexHdr(pWal), &pWal->hdr, sizeof(WalIndexHdr))
    ){
      walUnlockShared(pWal, WAL_READ_LOCK(mxI));
      return WAL_RETRY;
    }else{
      assert( mxReadMark<=pWal->hdr.mxFrame );
      pWal->readLock = mxI;
    }
  }
  return rc;
}

/*
** Begin a read transaction on the database.
................................................................................
    sqlite3Put4byte(&aWalHdr[8], szPage);
    sqlite3Put4byte(&aWalHdr[12], pWal->nCkpt);
    memcpy(&aWalHdr[16], pWal->hdr.aSalt, 8);
    walChecksumBytes(1, aWalHdr, WAL_HDRSIZE-2*4, 0, aCksum);
    sqlite3Put4byte(&aWalHdr[24], aCksum[0]);
    sqlite3Put4byte(&aWalHdr[28], aCksum[1]);
    
    pWal->szPage = szPage;
    pWal->hdr.bigEndCksum = SQLITE_BIGENDIAN;
    pWal->hdr.aFrameCksum[0] = aCksum[0];
    pWal->hdr.aFrameCksum[1] = aCksum[1];

    rc = sqlite3OsWrite(pWal->pWalFd, aWalHdr, sizeof(aWalHdr), 0);
    WALTRACE(("WAL%p: wal-header write %s\n", pWal, rc ? "failed" : "ok"));
    if( rc!=SQLITE_OK ){
................................................................................
    iFrame++;
    nLast--;
    rc = walIndexAppend(pWal, iFrame, pLast->pgno);
  }

  if( rc==SQLITE_OK ){
    /* Update the private copy of the header. */
    pWal->hdr.szPage = szPage;
    pWal->hdr.mxFrame = iFrame;
    if( isCommit ){
      pWal->hdr.iChange++;
      pWal->hdr.nPage = nTruncate;
    }
    /* If this is a commit, update the wal-index header too. */
    if( isCommit ){

static int walIndexPage(Wal *pWal, int iPage, volatile u32 **ppPage){
  int rc = SQLITE_OK;

  /* Enlarge the pWal->apWiData[] array if required */
  if( pWal->nWiData<=iPage ){
    int nByte = sizeof(u32 *)*(iPage+1);
    volatile u32 **apNew;
    apNew = (volatile u32 **)sqlite3_realloc((void *)pWal->apWiData, nByte);
    if( !apNew ){
      *ppPage = 0;
      return SQLITE_NOMEM;
    }
    memset((void *)&apNew[pWal->nWiData], 0, sizeof(u32 *)*(iPage+1-pWal->nWiData));
    pWal->apWiData = apNew;
    pWal->nWiData = iPage+1;
  }

  /* Request a pointer to the required page from the VFS */
  if( pWal->apWiData[iPage]==0 ){
    rc = sqlite3OsShmMap(pWal->pDbFd, iPage, WALINDEX_PGSZ, 
................................................................................
static int walLockShared(Wal *pWal, int lockIdx){
  int rc;
  if( pWal->exclusiveMode ) return SQLITE_OK;
  rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
                        SQLITE_SHM_LOCK | SQLITE_SHM_SHARED);
  WALTRACE(("WAL%p: acquire SHARED-%s %s\n", pWal,
            walLockName(lockIdx), rc ? "failed" : "ok"));
  VVA_ONLY( pWal->lockError = (u8)(rc!=SQLITE_OK && rc!=SQLITE_BUSY); )
  return rc;
}
static void walUnlockShared(Wal *pWal, int lockIdx){
  if( pWal->exclusiveMode ) return;
  (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
                         SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED);
  WALTRACE(("WAL%p: release SHARED-%s\n", pWal, walLockName(lockIdx)));
................................................................................
static int walLockExclusive(Wal *pWal, int lockIdx, int n){
  int rc;
  if( pWal->exclusiveMode ) return SQLITE_OK;
  rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
                        SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE);
  WALTRACE(("WAL%p: acquire EXCLUSIVE-%s cnt=%d %s\n", pWal,
            walLockName(lockIdx), n, rc ? "failed" : "ok"));
  VVA_ONLY( pWal->lockError = (u8)(rc!=SQLITE_OK && rc!=SQLITE_BUSY); )
  return rc;
}
static void walUnlockExclusive(Wal *pWal, int lockIdx, int n){
  if( pWal->exclusiveMode ) return;
  (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
                         SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE);
  WALTRACE(("WAL%p: release EXCLUSIVE-%s cnt=%d\n", pWal,
................................................................................
      aHash[i] = 0;
    }
  }
  
  /* Zero the entries in the aPgno array that correspond to frames with
  ** frame numbers greater than pWal->hdr.mxFrame. 
  */
  nByte = (int)((char *)aHash - (char *)&aPgno[iLimit+1]);
  memset((void *)&aPgno[iLimit+1], 0, nByte);

#ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
  /* Verify that the every entry in the mapping region is still reachable
  ** via the hash table even after the cleanup.
  */
  if( iLimit ){
................................................................................
    idx = iFrame - iZero;
    assert( idx <= HASHTABLE_NSLOT/2 + 1 );
    
    /* If this is the first entry to be added to this hash-table, zero the
    ** entire hash table and aPgno[] array before proceding. 
    */
    if( idx==1 ){
      int nByte = (int)((u8 *)&aHash[HASHTABLE_NSLOT] - (u8 *)&aPgno[1]);
      memset((void*)&aPgno[1], 0, nByte);
    }

    /* If the entry in aPgno[] is already set, then the previous writer
    ** must have exited unexpectedly in the middle of a transaction (after
    ** writing one or more dirty pages to the WAL to free up memory). 
    ** Remove the remnants of that writers uncommitted transaction from 
................................................................................
    }

    /* Write the aPgno[] array entry and the hash-table slot. */
    for(iKey=walHash(iPage); aHash[iKey]; iKey=walNextHash(iKey)){
      assert( nCollide++ < idx );
    }
    aPgno[idx] = iPage;
    aHash[iKey] = (ht_slot)idx;

#ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
    /* Verify that the number of entries in the hash table exactly equals
    ** the number of entries in the mapping region.
    */
    {
      int i;           /* Loop counter */
................................................................................
    if( (magic&0xFFFFFFFE)!=WAL_MAGIC 
     || szPage&(szPage-1) 
     || szPage>SQLITE_MAX_PAGE_SIZE 
     || szPage<512 
    ){
      goto finished;
    }
    pWal->hdr.bigEndCksum = (u8)(magic&0x00000001);
    pWal->szPage = (u16)szPage;
    pWal->nCkpt = sqlite3Get4byte(&aBuf[12]);
    memcpy(&pWal->hdr.aSalt, &aBuf[16], 8);

    /* Verify that the WAL header checksum is correct */
    walChecksumBytes(pWal->hdr.bigEndCksum==SQLITE_BIGENDIAN, 
        aBuf, WAL_HDRSIZE-2*4, 0, pWal->hdr.aFrameCksum
    );
................................................................................
      rc = walIndexAppend(pWal, ++iFrame, pgno);
      if( rc!=SQLITE_OK ) break;

      /* If nTruncate is non-zero, this is a commit record. */
      if( nTruncate ){
        pWal->hdr.mxFrame = iFrame;
        pWal->hdr.nPage = nTruncate;
        pWal->hdr.szPage = (u16)szPage;
        aFrameCksum[0] = pWal->hdr.aFrameCksum[0];
        aFrameCksum[1] = pWal->hdr.aFrameCksum[1];
      }
    }

    sqlite3_free(aFrame);
  }
................................................................................
    rc = walHashGet(pWal, i, &aHash, &aPgno, &iZero);
    if( rc==SQLITE_OK ){
      int j;                      /* Counter variable */
      int nEntry;                 /* Number of entries in this segment */
      ht_slot *aIndex;            /* Sorted index for this segment */

      aPgno++;
      nEntry = (int)(((i+1)==nSegment)?(int)(iLast-iZero):(u32 *)aHash-(u32 *)aPgno);
      aIndex = &((ht_slot *)&p->aSegment[p->nSegment])[iZero];
      iZero++;
  
      for(j=0; j<nEntry; j++){
        aIndex[j] = (ht_slot)j;
      }
      walMergesort((u32 *)aPgno, aTmp, aIndex, &nEntry);
      p->aSegment[i].iZero = iZero;
      p->aSegment[i].nEntry = nEntry;
      p->aSegment[i].aIndex = aIndex;
      p->aSegment[i].aPgno = (u32 *)aPgno;
    }
................................................................................

    walIndexClose(pWal, isDelete);
    sqlite3OsClose(pWal->pWalFd);
    if( isDelete ){
      sqlite3OsDelete(pWal->pVfs, pWal->zWalName, 0);
    }
    WALTRACE(("WAL%p: closed\n", pWal));
    sqlite3_free((void *)pWal->apWiData);
    sqlite3_free(pWal);
  }
  return rc;
}

/*
** Try to read the wal-index header.  Return 0 on success and 1 if
................................................................................
    if( pInfo->aReadMark[mxI]!=mxReadMark
     || memcmp((void *)walIndexHdr(pWal), &pWal->hdr, sizeof(WalIndexHdr))
    ){
      walUnlockShared(pWal, WAL_READ_LOCK(mxI));
      return WAL_RETRY;
    }else{
      assert( mxReadMark<=pWal->hdr.mxFrame );
      pWal->readLock = (i16)mxI;
    }
  }
  return rc;
}

/*
** Begin a read transaction on the database.
................................................................................
    sqlite3Put4byte(&aWalHdr[8], szPage);
    sqlite3Put4byte(&aWalHdr[12], pWal->nCkpt);
    memcpy(&aWalHdr[16], pWal->hdr.aSalt, 8);
    walChecksumBytes(1, aWalHdr, WAL_HDRSIZE-2*4, 0, aCksum);
    sqlite3Put4byte(&aWalHdr[24], aCksum[0]);
    sqlite3Put4byte(&aWalHdr[28], aCksum[1]);
    
    pWal->szPage = (u16)szPage;
    pWal->hdr.bigEndCksum = SQLITE_BIGENDIAN;
    pWal->hdr.aFrameCksum[0] = aCksum[0];
    pWal->hdr.aFrameCksum[1] = aCksum[1];

    rc = sqlite3OsWrite(pWal->pWalFd, aWalHdr, sizeof(aWalHdr), 0);
    WALTRACE(("WAL%p: wal-header write %s\n", pWal, rc ? "failed" : "ok"));
    if( rc!=SQLITE_OK ){
................................................................................
    iFrame++;
    nLast--;
    rc = walIndexAppend(pWal, iFrame, pLast->pgno);
  }

  if( rc==SQLITE_OK ){
    /* Update the private copy of the header. */
    pWal->hdr.szPage = (u16)szPage;
    pWal->hdr.mxFrame = iFrame;
    if( isCommit ){
      pWal->hdr.iChange++;
      pWal->hdr.nPage = nTruncate;
    }
    /* If this is a commit, update the wal-index header too. */
    if( isCommit ){

        pIdx->aiColumn[n] = pTerm->u.leftColumn;
        pColl = sqlite3BinaryCompareCollSeq(pParse, pX->pLeft, pX->pRight);
        pIdx->azColl[n] = pColl->zName;
        n++;
      }
    }
  }
  assert( n==pLevel->plan.nEq );

  /* Add additional columns needed to make the automatic index into
  ** a covering index */
  for(i=0; i<mxBitCol; i++){
    if( extraCols & (((Bitmask)1)<<i) ){
      pIdx->aiColumn[n] = i;
      pIdx->azColl[n] = "BINARY";
................................................................................
    zEndAff = sqlite3DbStrDup(pParse->db, zStartAff);
    addrNxt = pLevel->addrNxt;

    /* If we are doing a reverse order scan on an ascending index, or
    ** a forward order scan on a descending index, interchange the 
    ** start and end terms (pRangeStart and pRangeEnd).
    */
    if( bRev==(pIdx->aSortOrder[nEq]==SQLITE_SO_ASC) ){
      SWAP(WhereTerm *, pRangeEnd, pRangeStart);
    }

    testcase( pRangeStart && pRangeStart->eOperator & WO_LE );
    testcase( pRangeStart && pRangeStart->eOperator & WO_GE );
    testcase( pRangeEnd && pRangeEnd->eOperator & WO_LE );
    testcase( pRangeEnd && pRangeEnd->eOperator & WO_GE );

        pIdx->aiColumn[n] = pTerm->u.leftColumn;
        pColl = sqlite3BinaryCompareCollSeq(pParse, pX->pLeft, pX->pRight);
        pIdx->azColl[n] = pColl->zName;
        n++;
      }
    }
  }
  assert( (u32)n==pLevel->plan.nEq );

  /* Add additional columns needed to make the automatic index into
  ** a covering index */
  for(i=0; i<mxBitCol; i++){
    if( extraCols & (((Bitmask)1)<<i) ){
      pIdx->aiColumn[n] = i;
      pIdx->azColl[n] = "BINARY";
................................................................................
    zEndAff = sqlite3DbStrDup(pParse->db, zStartAff);
    addrNxt = pLevel->addrNxt;

    /* If we are doing a reverse order scan on an ascending index, or
    ** a forward order scan on a descending index, interchange the 
    ** start and end terms (pRangeStart and pRangeEnd).
    */
    if( nEq<pIdx->nColumn && bRev==(pIdx->aSortOrder[nEq]==SQLITE_SO_ASC) ){
      SWAP(WhereTerm *, pRangeEnd, pRangeStart);
    }

    testcase( pRangeStart && pRangeStart->eOperator & WO_LE );
    testcase( pRangeStart && pRangeStart->eOperator & WO_GE );
    testcase( pRangeEnd && pRangeEnd->eOperator & WO_LE );
    testcase( pRangeEnd && pRangeEnd->eOperator & WO_GE );

if {$tcl_platform(platform)!="windows"} {
  do_malloc_test 14 -tclprep {
    catch {db close}
    sqlite3 db2 test2.db
    sqlite3_extended_result_codes db2 1
    db2 eval {

      PRAGMA synchronous = 0;
      CREATE TABLE t1(a, b);
      INSERT INTO t1 VALUES(1, 2);
      BEGIN;
      INSERT INTO t1 VALUES(3, 4);
    }
    copy_file test2.db test.db

if {$tcl_platform(platform)!="windows"} {
  do_malloc_test 14 -tclprep {
    catch {db close}
    sqlite3 db2 test2.db
    sqlite3_extended_result_codes db2 1
    db2 eval {
      PRAGMA journal_mode = DELETE;    /* For inmemory_journal permutation */
      PRAGMA synchronous = 0;
      CREATE TABLE t1(a, b);
      INSERT INTO t1 VALUES(1, 2);
      BEGIN;
      INSERT INTO t1 VALUES(3, 4);
    }
    copy_file test2.db test.db

#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing the sqlite3_unlock_notify() API.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl








set esc [sqlite3_enable_shared_cache 1]

sqlite3 db  test.db
file delete -force test.db2 test.db2-journal test.db2-wal
sqlite3 db2 test.db2

#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing the sqlite3_unlock_notify() API.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# This script only runs if shared-cache and unlock-notify are available.
#
ifcapable !unlock_notify||!shared_cache { 
  finish_test 
  return 
}

set esc [sqlite3_enable_shared_cache 1]

sqlite3 db  test.db
file delete -force test.db2 test.db2-journal test.db2-wal
sqlite3 db2 test.db2

#-------------------------------------------------------------------------
# The following tests work with "PRAGMA max_page_count"
#
do_test pager1-6.1 {
  faultsim_delete_and_reopen
  execsql {

    PRAGMA max_page_count = 10;
    CREATE TABLE t2(a, b);
    CREATE TABLE t3(a, b);
    CREATE TABLE t4(a, b);
    CREATE TABLE t5(a, b);
    CREATE TABLE t6(a, b);
    CREATE TABLE t7(a, b);
................................................................................
}
db close

tv sectorsize 4096
do_test pager1.10.x.1 {
  faultsim_delete_and_reopen
  execsql {

    PRAGMA page_size = 1024;
    CREATE TABLE t1(x);
  }
  for {set i 0} {$i<30} {incr i} {
    execsql { INSERT INTO t1 VALUES(zeroblob(900)) }
  }
  file size test.db
................................................................................
do_execsql_test pager1-11.5 { SELECT count(*) FROM zz } {32}
db close
tv delete
  
#-------------------------------------------------------------------------
# Test "PRAGMA page_size"
#


foreach pagesize {
    512   1024   2048 4096 8192 16384 32768 
} {
  faultsim_delete_and_reopen









  do_test pager1-12.$pagesize.1 {
    sqlite3 db2 test.db
    execsql "
      PRAGMA page_size = $pagesize;
      CREATE VIEW v AS SELECT * FROM sqlite_master;
    " db2
    file size test.db
  } $pagesize
  do_test pager1-12.$pagesize.2 {
    sqlite3 db2 test.db
    execsql { 
      SELECT count(*) FROM v;
      PRAGMA main.page_size;
    } db2
  } [list 1 $pagesize]
  do_test pager1-12.$pagesize.3 {
    execsql { 
      SELECT count(*) FROM v;
      PRAGMA main.page_size;
    }
  } [list 1 $pagesize]
  db2 close
}



#-------------------------------------------------------------------------
# Test specal "PRAGMA journal_mode=PERSIST" test cases.
#
# pager1-13.1.*: This tests a special case encountered in persistent 
#                journal mode: If the journal associated with a transaction
#                is smaller than the journal file (because a previous 

#-------------------------------------------------------------------------
# The following tests work with "PRAGMA max_page_count"
#
do_test pager1-6.1 {
  faultsim_delete_and_reopen
  execsql {
    PRAGMA auto_vacuum = none;
    PRAGMA max_page_count = 10;
    CREATE TABLE t2(a, b);
    CREATE TABLE t3(a, b);
    CREATE TABLE t4(a, b);
    CREATE TABLE t5(a, b);
    CREATE TABLE t6(a, b);
    CREATE TABLE t7(a, b);
................................................................................
}
db close

tv sectorsize 4096
do_test pager1.10.x.1 {
  faultsim_delete_and_reopen
  execsql {
    PRAGMA auto_vacuum = none;
    PRAGMA page_size = 1024;
    CREATE TABLE t1(x);
  }
  for {set i 0} {$i<30} {incr i} {
    execsql { INSERT INTO t1 VALUES(zeroblob(900)) }
  }
  file size test.db
................................................................................
do_execsql_test pager1-11.5 { SELECT count(*) FROM zz } {32}
db close
tv delete
  
#-------------------------------------------------------------------------
# Test "PRAGMA page_size"
#
testvfs tv -default 1
tv sectorsize 1024
foreach pagesize {
    512   1024   2048 4096 8192 16384 32768 
} {
  faultsim_delete_and_reopen

  # The sector-size (according to the VFS) is 1024 bytes. So if the
  # page-size requested using "PRAGMA page_size" is greater than the
  # compile time value of SQLITE_MAX_PAGE_SIZE, then the effective 
  # page-size remains 1024 bytes.
  #
  set eff $pagesize
  if {$eff > $::SQLITE_MAX_PAGE_SIZE} { set eff 1024 }

  do_test pager1-12.$pagesize.1 {
    sqlite3 db2 test.db
    execsql "
      PRAGMA page_size = $pagesize;
      CREATE VIEW v AS SELECT * FROM sqlite_master;
    " db2
    file size test.db
  } $eff
  do_test pager1-12.$pagesize.2 {
    sqlite3 db2 test.db
    execsql { 
      SELECT count(*) FROM v;
      PRAGMA main.page_size;
    } db2
  } [list 1 $eff]
  do_test pager1-12.$pagesize.3 {
    execsql { 
      SELECT count(*) FROM v;
      PRAGMA main.page_size;
    }
  } [list 1 $eff]
  db2 close
}
db close
tv delete

#-------------------------------------------------------------------------
# Test specal "PRAGMA journal_mode=PERSIST" test cases.
#
# pager1-13.1.*: This tests a special case encountered in persistent 
#                journal mode: If the journal associated with a transaction
#                is smaller than the journal file (because a previous 

    BEGIN;
      INSERT INTO t1 SELECT a_string(200), a_string(300) FROM t1;
      CREATE TABLE aux.t2 AS SELECT * FROM t1;
    COMMIT;
  }
} -test {
  faultsim_test_result {0 {}}
  faultsim_integrity_check





  set res ""
  set rc [catch { set res [db one { PRAGMA aux.integrity_check }] }]
  if {$rc!=0 || $res != "ok"} {error "integrity-check problem:$rc $res"}
}

#-------------------------------------------------------------------------
# Test fault-injection as part of a commit when using 

    BEGIN;
      INSERT INTO t1 SELECT a_string(200), a_string(300) FROM t1;
      CREATE TABLE aux.t2 AS SELECT * FROM t1;
    COMMIT;
  }
} -test {
  faultsim_test_result {0 {}}


  catchsql { COMMIT }
  catchsql { ROLLBACK }

  faultsim_integrity_check
  set res ""
  set rc [catch { set res [db one { PRAGMA aux.integrity_check }] }]
  if {$rc!=0 || $res != "ok"} {error "integrity-check problem:$rc $res"}
}

#-------------------------------------------------------------------------
# Test fault-injection as part of a commit when using 

}
db func a_string a_string

do_test pagerfault2-1-pre1 {
  faultsim_delete_and_reopen
  db func a_string a_string
  execsql {

    PRAGMA journal_mode = DELETE;
    PRAGMA page_size = 1024;
    CREATE TABLE t1(a, b);
    INSERT INTO t1 VALUES(a_string(401), a_string(402));
  }
  for {set ii 0} {$ii < 13} {incr ii} {
    execsql { INSERT INTO t1 SELECT a_string(401), a_string(402) FROM t1 }

}
db func a_string a_string

do_test pagerfault2-1-pre1 {
  faultsim_delete_and_reopen
  db func a_string a_string
  execsql {
    PRAGMA auto_vacuum = 0;
    PRAGMA journal_mode = DELETE;
    PRAGMA page_size = 1024;
    CREATE TABLE t1(a, b);
    INSERT INTO t1 VALUES(a_string(401), a_string(402));
  }
  for {set ii 0} {$ii < 13} {incr ii} {
    execsql { INSERT INTO t1 SELECT a_string(401), a_string(402) FROM t1 }

  walbak.test    walhook.test   walcrash2.test walcksum.test
  walfault.test
} 

test_suite "coverage-pager" -description {
  Coverage tests for file pager.c.
} -files {
  pager1.test
  pager2.test
  pagerfault.test
  pagerfault2.test
  walfault.test
  walbak.test
  journal2.test
  tkt-9d68c883.test
} 


lappend ::testsuitelist xxx
#-------------------------------------------------------------------------
# Define the permutation test suites:
#

  walbak.test    walhook.test  walcrash2.test  walcksum.test
  walfault.test
} 

test_suite "coverage-pager" -description {
  Coverage tests for file pager.c.
} -files {



  pager1.test    pager2.test  pagerfault.test  pagerfault2.test



  walfault.test  walbak.test  journal2.test    tkt-9d68c883.test
} 


lappend ::testsuitelist xxx
#-------------------------------------------------------------------------
# Define the permutation test suites:
#

  puts [format {%12d uS %s %s} $tm $rate $u2]
  global total_time
  set total_time [expr {$total_time+$tm}]
}
proc speed_trial_init {name} {
  global total_time
  set total_time 0




}
proc speed_trial_summary {name} {
  global total_time
  puts [format {%-21.21s %12d uS TOTAL} $name $total_time]
}

# Run this routine last

  puts [format {%12d uS %s %s} $tm $rate $u2]
  global total_time
  set total_time [expr {$total_time+$tm}]
}
proc speed_trial_init {name} {
  global total_time
  set total_time 0
  sqlite3 versdb :memory:
  set vers [versdb one {SELECT sqlite_source_id()}]
  versdb close
  puts "SQLite $vers"
}
proc speed_trial_summary {name} {
  global total_time
  puts [format {%-21.21s %12d uS TOTAL} $name $total_time]
}

# Run this routine last

  set testname(1) multiproc
  set testname(2) singleproc
  set tn $testname($i)

  do_test wal3-2.$tn.1 {
    sql1 { 
      PRAGMA page_size = 1024;
      PRAGMA auto_vacuum = OFF; 
      PRAGMA journal_mode = WAL;
    }
    sql1 {
      CREATE TABLE t1(a, b);
      INSERT INTO t1 VALUES(1, 'one');
      BEGIN;
        SELECT * FROM t1;

  set testname(1) multiproc
  set testname(2) singleproc
  set tn $testname($i)

  do_test wal3-2.$tn.1 {
    sql1 { 
      PRAGMA page_size = 1024;

      PRAGMA journal_mode = WAL;
    }
    sql1 {
      CREATE TABLE t1(a, b);
      INSERT INTO t1 VALUES(1, 'one');
      BEGIN;
        SELECT * FROM t1;

# focus of this file is testing the operation of the library in
# "PRAGMA journal_mode=WAL" mode.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/wal_common.tcl


do_not_use_codec

ifcapable !wal {finish_test ; return }


# Test organization:
# 
#   walback-1.*: Simple tests.

#   walback-2.*: Test backups when the source db is modified mid-backup.



#

# Make sure a simple backup from a WAL database works.
#
do_test walbak-1.0 {
  execsql { 
    PRAGMA synchronous = NORMAL;
................................................................................
set sigB [sig db]
  list [B step 1000] [B finish]
} {SQLITE_DONE SQLITE_OK}
do_test walbak-2.12 {
  string compare [sig db] [sig db2]
} {0}
db2 close


























































































finish_test

# focus of this file is testing the operation of the library in
# "PRAGMA journal_mode=WAL" mode.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/wal_common.tcl
source $testdir/malloc_common.tcl

do_not_use_codec

ifcapable !wal {finish_test ; return }


# Test organization:
# 
#   walback-1.*: Simple tests.
#
#   walback-2.*: Test backups when the source db is modified mid-backup.
#
#   walback-3.*: Backup of WAL sources into rollback destinations, and 
#                vice-versa.
#

# Make sure a simple backup from a WAL database works.
#
do_test walbak-1.0 {
  execsql { 
    PRAGMA synchronous = NORMAL;
................................................................................
set sigB [sig db]
  list [B step 1000] [B finish]
} {SQLITE_DONE SQLITE_OK}
do_test walbak-2.12 {
  string compare [sig db] [sig db2]
} {0}
db2 close
db close

#-------------------------------------------------------------------------
# Run some backup operations to copy back and forth between WAL and:
#
#   walbak-3.1.*: an in-memory database
#
#   walbak-3.2.*: a temporary database
#
#   walbak-3.3.*: a database in rollback mode.
#
#   walbak-3.4.*: a database in rollback mode that (initially) uses a 
#                 different page-size.
#
# Check that this does not confuse any connected clients.
#
foreach {tn setup} {
  1 {
    sqlite3 db  test.db
    sqlite3 db2 :memory:
    db  eval { PRAGMA page_size = 1024 ; PRAGMA journal_mode = WAL }
    db2 eval { PRAGMA page_size = 1024 }
  }

  2 {
    sqlite3 db  test.db
    sqlite3 db2 ""
    db  eval { PRAGMA page_size = 1024 ; PRAGMA journal_mode = WAL }
    db2 eval { PRAGMA page_size = 1024 }
  }

  3 {
    sqlite3 db  test.db
    sqlite3 db2 test.db2
    db  eval { PRAGMA page_size = 1024 ; PRAGMA journal_mode = WAL }
    db2 eval { PRAGMA page_size = 1024 ; PRAGMA journal_mode = PERSIST }
  }

  4 {
    sqlite3 db  test.db
    sqlite3 db2 test.db2
    db  eval { PRAGMA page_size = 1024 ; PRAGMA journal_mode = WAL }
    db2 eval { 
      PRAGMA page_size = 2048;
      PRAGMA journal_mode = PERSIST;
      CREATE TABLE xx(x);
    }
  }

} {
  foreach f [glob -nocomplain test.db*] { file delete -force $f }

  eval $setup

  do_test walbak-3.$tn.1 {
    execsql {
      CREATE TABLE t1(a, b);
      INSERT INTO t1 VALUES(1, 2);
      INSERT INTO t1 VALUES(3, 4);
      SELECT * FROM t1;
    }
  } {1 2 3 4}

  do_test walbak-3.$tn.2 {
    sqlite3_backup B db2 main db main
    B step 10000
    B finish
    execsql { SELECT * FROM t1 } db2
  } {1 2 3 4}

  do_test walbak-3.$tn.3 {
    execsql {
      INSERT INTO t1 VALUES(5, 6);
      INSERT INTO t1 VALUES(7, 8);
      SELECT * FROM t1;
    } db2
  } {1 2 3 4 5 6 7 8}

  do_test walbak-3.$tn.4 {
    sqlite3_backup B db main db2 main
    B step 10000
    B finish
    execsql { SELECT * FROM t1 }
  } {1 2 3 4 5 6 7 8}

  db  close
  db2 close
}


finish_test