# Release Notes » Release 2.4.0 (2020/03/25)

Cpp-Taskflow 2.4.0 is the 6th release in the 2.x line! This release includes several new changes such as CPU-GPU tasking, improved scheduling flow, documentation, and unit tests.

## Download

Cpp-Taskflow 2.4.0 can be downloaded from here.

## New Features

- added tf::cudaFlow for concurrent CPU-GPU tasking (see GPU Tasking (cudaFlow))
- added a new method tf::Executor::num_topologies to query the number of running taskflows in an executor
- added std::hash support for tf::Task
- added a new work-stealing algorithm capable of general heterogeneous domains
- added unittests for CUDA work (enable by `-DTF_ENABLE_CUDA` during cmake)

## Bug Fixes

- fixed the bug in nested execution (#152)
- fixed the nameless union/struct extension warning in MS environment (#153)
- fixed the warning/error by changing the type of join counter to std::size (#137)

## Miscellaneous Items

- reflected the showcase presentation on CPU-GPU tasking

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