// Read swapped-out tuple data into readBuffer_
IoStatus
SwapSpace::fetch(void)
{
IoStatus status = OK;
ex_assert((ioPending_ == NONE), "fetch() invoked while I/O pending");
ex_assert((store_), "fetch() - temporary storage uninitialized");
ex_assert((numSwap_ > 0), "fetch() - no SwapSpace buffers to fetch");
ex_assert((swapRead_ < swapEnd_), "fetch() - can't fetch past end of file");
if (!readBuffer_)
{
readBuffer_ = memory_.getBuffer(true);
ex_assert((readBuffer_), "fetch() - failed to get read buffer");
}
ioPending_ = READ;
readingFirstBuffer_ = false;
// ScratchSapce blockNums are 1..N
#if defined(NA_HAS_ANSI_CPP_CASTS)
Int32 blockNum = static_cast<Int32>(swapRead_ / swapBufferSize_) + 1;
#else
Int32 blockNum = ((Int32) (swapRead_ / swapBufferSize_)) + 1;
#endif
status = mapStatus(store_->readThru(readBuffer_, blockNum,
swapBufferSize_));
// status is OK if read was successfully initiated
return status;
}
IoStatus
SwapSpace::swapOut(char* buffer)
{
IoStatus status = OK;
if (!store_)
{
init(); // failure is fatal
}
else
{
status = checkIO();
}
if (status == OK)
{
swapOutBuffer_ = buffer;
// Initiate overflow of buffer to temporary storage
ioPending_ = WRITE;
DWORD ignoredBlockNum = 0;
status = mapStatus(store_->writeThru(swapOutBuffer_, swapBufferSize_,
ignoredBlockNum));
// status is OK if write was successfully initiated
}
return status;
}
IoStatus
SwapSpace::checkIOPending(bool* readCompleted)
{
IoStatus status = OK;
ex_assert((ioPending_ != NONE),
"checkIOPending not called via checkIO wrapper");
ex_assert((store_), "temporary storage uninitialized");
status = mapStatus(store_->checkIO());
if (status == OK)
{
// A read or a write operation has completed.
if (ioPending_ == READ)
{
readingFirstBuffer_ = ((swapRead_ == swapStart_)
&& (swapRead_ != swapEnd_));
if (readCompleted)
{
*readCompleted = true;
}
}
else
{
// A SwapSpace buffer has been written to temporary storage.
// The swapOutBuffer_ is available for reuse.
memory_.reuse(swapOutBuffer_);
swapOutBuffer_ = NULL;
++numSwap_;
swapEnd_ += swapBufferSize_;
}
ioPending_ = NONE;
}
return status;
}
rtError pxAnimate::pxAnimationParams::status(rtString& v) const
{
v = mapStatus(mStatus);
return RT_OK;
};
