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What's New? Intel® Threading Building Blocks 4.3 Update 5

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Changes (w.r.t. Intel TBB 4.3 Update 4):
- Added add_ref_count() method of class tbb::task.

Preview Features:
- Added class global_control for application-wide control of allowed
    parallelism and thread stack size.
- memory_pool_allocator now throws the std::bad_alloc exception on
    allocation failure.
- Exceptions thrown for by memory pool constructors changed from
    std::bad_alloc to std::invalid_argument and std::runtime_error.

Bugs fixed:
- scalable_allocator now throws the std::bad_alloc exception on
    allocation failure.
- Fixed a race condition in the memory allocator that may lead to
    excessive memory consumption under high multithreading load.
- A new scheduler created right after destruction of the previous one
    might be unable to modify the number of worker threads.

Open-source contributions integrated:
- (Added but not enabled) push_front() method of class tbb::task_list
    by Raf Schietekat.


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