context Programming examples

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      the program included herein hails from the
      toolbox/documents/irix/userContext.html 
      July 1995 Pipeline article, 
     "Getting and Setting User Context Within a Process".


     The following program provides an example of using the getcontext(2),
     setcontext(2) and makecontext(3C) functions introduced in IRIX 5.x. 
     These functions are useful for implementing user level context 
     switching between multiple threads of control within a single IRIX 
     process.


     Each thread's context is defined in ucontext(5). A thread's context is
     maintained and created by the operating system primarily because it 
     includes the signal mask (which is maintained by the operating system).
      

      













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