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 for cooperative multitasking
From The Free On-line Dictionary of Computing (30 December 2018) :

  cooperative multitasking
      A form of multitasking where it
     is the responsibility of the currently running task to give up
     the processor to allow other tasks to run.  This contrasts
     with pre-emptive multitasking where the task scheduler
     periodically suspends the running task and restarts another.
     Cooperative multitasking requires the programmer to place
     calls at suitable points in his code to allow his task to be
     descheduled which is not always easy if there is no obvious
     top-level main loop or some routines run for a long time.
     If a task does not allow itself to be descheduled all other
     tasks on the system will appear to "freeze" and will not
     respond to user action.
     The advantage of cooperative multitasking is that the
     programmer knows where the program will be descheduled and can
     make sure that this will not cause unwanted interaction with
     other processes.  Under pre-emptive multitasking, the
     scheduler must ensure that sufficient state for each process
     is saved and restored that they will not interfere.  Thus
     cooperative multitasking can have lower overheads than
     pre-emptive multitasking because of the greater control it
     offers over when a task may be descheduled.
     Cooperative multitasking is used in RISC OS, Microsoft
     Windows and Macintosh System 7.

Contact=webmaster@dict.org Specification=RFC 2229