Intel Threading Building Blocks for Mac 2013 can be downloaded from our website for free.
From the developer:
Intel TBB is an award-winning runtime library that simplifies the writing of multi-threaded applications. Just like the C++ Standard Template Library (STL) extends the core language, Intel TBB offers C++ users a higher level abstraction for parallelism. To implement Intel TBB developers use familiar C++ templates and coding style, leaving the low-level threading details to the library.
You may want to check out more software for Mac, such as Presto Builder, We Build SG or iMap Builder, which might be similar to Intel Threading Building Blocks for Mac.
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