private unsafe bool BufferAndLoad(long currentAddress, long currentPage, long currentFrame, long headAddress)
{
for (int i = 0; i < frameSize; i++)
{
var nextPage = currentPage + i;
// Cannot load page if its not fully written to storage
if (headAddress < (nextPage + 1) << allocator.LogPageSizeBits)
{
continue;
}
var nextFrame = (currentFrame + i) % frameSize;
long val;
while ((val = nextLoadedPage[nextFrame]) < nextPage || loadedPage[nextFrame] < nextPage)
{
if (val < nextPage && Interlocked.CompareExchange(ref nextLoadedPage[nextFrame], nextPage, val) == val)
{
var tmp_i = i;
epoch.BumpCurrentEpoch(() =>
{
allocator.AsyncReadPagesFromDeviceToFrame(tmp_i + (currentAddress >> allocator.LogPageSizeBits), 1, endAddress, AsyncReadPagesCallback, Empty.Default, frame, out loaded[nextFrame], 0, null, null, loadedCancel[nextFrame]);
loadedPage[nextFrame] = nextPage;
});
}
else
{
epoch.ProtectAndDrain();
}
}
}
return(WaitForFrameLoad(currentAddress, currentFrame));
}
/// <summary>
/// Buffer and load
/// </summary>
/// <param name="currentAddress"></param>
/// <param name="currentPage"></param>
/// <param name="currentFrame"></param>
/// <param name="headAddress"></param>
/// <param name="endAddress"></param>
/// <returns></returns>
protected unsafe bool BufferAndLoad(long currentAddress, long currentPage, long currentFrame, long headAddress, long endAddress)
{
for (int i = 0; i < frameSize; i++)
{
var nextPage = currentPage + i;
var pageStartAddress = nextPage << logPageSizeBits;
// Cannot load page if it is entirely in memory or beyond the end address
if (pageStartAddress >= headAddress || pageStartAddress >= endAddress)
{
continue;
}
var pageEndAddress = (nextPage + 1) << logPageSizeBits;
if (endAddress < pageEndAddress)
{
pageEndAddress = endAddress;
}
if (headAddress < pageEndAddress)
{
pageEndAddress = headAddress;
}
var nextFrame = (currentFrame + i) % frameSize;
long val;
while ((val = nextLoadedPage[nextFrame]) < pageEndAddress || loadedPage[nextFrame] < pageEndAddress)
{
if (val < pageEndAddress && Interlocked.CompareExchange(ref nextLoadedPage[nextFrame], pageEndAddress, val) == val)
{
var tmp_i = i;
if (epoch != null)
{
epoch.BumpCurrentEpoch(() =>
{
AsyncReadPagesFromDeviceToFrame(tmp_i + (currentAddress >> logPageSizeBits), 1, endAddress, Empty.Default, out loaded[nextFrame], 0, null, null, loadedCancel[nextFrame]);
loadedPage[nextFrame] = pageEndAddress;
});
}
else
{
AsyncReadPagesFromDeviceToFrame(tmp_i + (currentAddress >> logPageSizeBits), 1, endAddress, Empty.Default, out loaded[nextFrame], 0, null, null, loadedCancel[nextFrame]);
loadedPage[nextFrame] = pageEndAddress;
}
}
else
{
epoch?.ProtectAndDrain();
}
}
}
return(WaitForFrameLoad(currentAddress, currentFrame));
}
private unsafe bool BufferAndLoad(long currentAddress, long currentPage, long currentFrame, long headAddress)
{
for (int i = 0; i < frameSize; i++)
{
var nextPage = currentPage + i;
var pageEndAddress = (nextPage + 1) << allocator.LogPageSizeBits;
if (fasterLog.readOnlyMode)
{
// Support partial page reads of committed data
var _flush = fasterLog.CommittedUntilAddress;
if (_flush < pageEndAddress)
{
pageEndAddress = _flush;
}
}
// Cannot load page if its not fully written to storage
if (headAddress < pageEndAddress)
{
continue;
}
var nextFrame = (currentFrame + i) % frameSize;
long val;
while ((val = nextLoadedPage[nextFrame]) < pageEndAddress || loadedPage[nextFrame] < pageEndAddress)
{
if (val < pageEndAddress && Interlocked.CompareExchange(ref nextLoadedPage[nextFrame], pageEndAddress, val) == val)
{
var tmp_i = i;
epoch.BumpCurrentEpoch(() =>
{
allocator.AsyncReadPagesFromDeviceToFrame(tmp_i + (currentAddress >> allocator.LogPageSizeBits), 1, endAddress, AsyncReadPagesCallback, Empty.Default, frame, out loaded[nextFrame], 0, null, null, loadedCancel[nextFrame]);
loadedPage[nextFrame] = pageEndAddress;
});
}
else
{
epoch.ProtectAndDrain();
}
}
}
return(WaitForFrameLoad(currentAddress, currentFrame));
}