An interesting approach to multithreading has been proposed by the IRIX operating system from SGI.
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A regular IRIX process can create a shared process group by calling sproc system call. The sproc call works similarly to a regular Unix fork, except that it creates a copy of the calling process which has the same address space for both the code and the data segments.
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While it is not a multithreading according to a strict definition, it certainly has many aspects of it.
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