/*
** If the STATIC_MEM mutex is not already held, obtain it now. The mutex
** will already be held (obtained by code in malloc.c) if
** sqlite3GlobalConfig.bMemStat is true.
*/
static void memsys5Enter(void){
  if( sqlite3GlobalConfig.bMemstat==0 && mem5.mutex==0 ){
    mem5.mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MEM);
  }
  sqlite3_mutex_enter(mem5.mutex);
}
static void memsys5Leave(void){
  sqlite3_mutex_leave(mem5.mutex);
}

/*
................................................................................
  int iLog;
  for(iLog=0; (1<<iLog)<iValue; iLog++);
  return iLog;
}

/*
** Initialize the memory allocator.



*/
static int memsys5Init(void *NotUsed){
  int ii;            /* Loop counter */
  int nByte;         /* Number of bytes of memory available to this allocator */
  u8 *zByte;         /* Memory usable by this allocator */
  int nMinLog;       /* Log base 2 of minimum allocation size in bytes */
  int iOffset;       /* An offset into mem5.aCtrl[] */

  UNUSED_PARAMETER(NotUsed);




  /* The size of a Mem5Link object must be a power of two.  Verify that
  ** this is case.
  */
  assert( (sizeof(Mem5Link)&(sizeof(Mem5Link)-1))==0 );

  nByte = sqlite3GlobalConfig.nHeap;
................................................................................
    if( (iOffset+nAlloc)<=mem5.nBlock ){
      mem5.aCtrl[iOffset] = ii | CTRL_FREE;
      memsys5Link(iOffset, ii);
      iOffset += nAlloc;
    }
    assert((iOffset+nAlloc)>mem5.nBlock);
  }






  return SQLITE_OK;
}

/*
** Deinitialize this module.
*/

/*
** If the STATIC_MEM mutex is not already held, obtain it now. The mutex
** will already be held (obtained by code in malloc.c) if
** sqlite3GlobalConfig.bMemStat is true.
*/
static void memsys5Enter(void){



  sqlite3_mutex_enter(mem5.mutex);
}
static void memsys5Leave(void){
  sqlite3_mutex_leave(mem5.mutex);
}

/*
................................................................................
  int iLog;
  for(iLog=0; (1<<iLog)<iValue; iLog++);
  return iLog;
}

/*
** Initialize the memory allocator.
**
** This routine is not threadsafe.  The caller must be holding a mutex
** to prevent multiple threads from entering at the same time.
*/
static int memsys5Init(void *NotUsed){
  int ii;            /* Loop counter */
  int nByte;         /* Number of bytes of memory available to this allocator */
  u8 *zByte;         /* Memory usable by this allocator */
  int nMinLog;       /* Log base 2 of minimum allocation size in bytes */
  int iOffset;       /* An offset into mem5.aCtrl[] */

  UNUSED_PARAMETER(NotUsed);

  /* For the purposes of this routine, disable the mutex */
  mem5.mutex = 0;

  /* The size of a Mem5Link object must be a power of two.  Verify that
  ** this is case.
  */
  assert( (sizeof(Mem5Link)&(sizeof(Mem5Link)-1))==0 );

  nByte = sqlite3GlobalConfig.nHeap;
................................................................................
    if( (iOffset+nAlloc)<=mem5.nBlock ){
      mem5.aCtrl[iOffset] = ii | CTRL_FREE;
      memsys5Link(iOffset, ii);
      iOffset += nAlloc;
    }
    assert((iOffset+nAlloc)>mem5.nBlock);
  }

  /* If a mutex is required for normal operation, allocate one */
  if( sqlite3GlobalConfig.bMemstat==0 && mem5.mutex==0 ){
    mem5.mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MEM);
  }

  return SQLITE_OK;
}

/*
** Deinitialize this module.
*/