cub::GridQueue#
-
template<typename OffsetT>
class GridQueue# GridQueue is a descriptor utility for dynamic queue management.
- Overview
GridQueue descriptors provides abstractions for “filling” or “draining” globally-shared vectors.
A “filling” GridQueue works by atomically-adding to a zero-initialized counter, returning a unique offset for the calling thread to write its items. The GridQueue maintains the total “fill-size”. The fill counter must be reset using GridQueue::ResetFill by the host or kernel instance prior to the kernel instance that will be filling.
Similarly, a “draining” GridQueue works by atomically-incrementing a zero-initialized counter, returning a unique offset for the calling thread to read its items. Threads can safely drain until the array’s logical fill-size is exceeded. The drain counter must be reset using GridQueue::ResetDrain or GridQueue::FillAndResetDrain by the host or kernel instance prior to the kernel instance that will be filling. (For dynamic work distribution of existing data, the corresponding fill-size is simply the number of elements in the array.)
Iterative work management can be implemented simply with a pair of flip-flopping work buffers, each with an associated set of fill and drain GridQueue descriptors.
- Template Parameters:
OffsetT – Signed integer type for global offsets
Public Functions
-
inline GridQueue(void *d_storage)#
Constructs a GridQueue descriptor around the device storage allocation.
- Parameters:
d_storage – Device allocation to back the GridQueue. Must be at least as big as
AllocationSize().
- inline cudaError_t FillAndResetDrain(
- OffsetT fill_size,
- cudaStream_t stream = 0,
This operation sets the fill-size and resets the drain counter, preparing the GridQueue for draining in the next kernel instance.
To be called by the host or by a kernel prior to the one which will be draining.
-
inline cudaError_t ResetDrain(cudaStream_t stream = 0)#
This operation resets the drain so that it may advance to meet the existing fill-size.
To be called by the host or by a kernel prior to the one which will be draining.
-
inline cudaError_t ResetFill(cudaStream_t stream = 0)#
This operation resets the fill counter.
To be called by the host or by a kernel prior to the one which will be filling.
- inline cudaError_t FillSize(
- OffsetT &fill_size,
- cudaStream_t stream = 0,
Returns the fill-size established by the parent or by the previous kernel.