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M
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SOURCE: qdev_autodocs.txt 1.163 (12/09/2014) English

                                 AMIGA - MEM_#?
 ----------------------------------------------------------------------------

   NAME

      mem_dosynctasks() - Narrows task switching to selected
                          tasks.



   SYNOPSIS

      res = mem_dosynctask(tasks);

      LONG mem_dosynctask(ULONG *);



   FUNCTION

      This function allows pseudo-exclusive interaction with
      multiple tasks by manipulating their priorities, so it
      it looks like 'Forbid()', but it is not!



   INPUTS

      tasks  - Array of task addresses terminated with NULL.
               Addresses are integers! Passing NULL causes
               restore.



   RETURNS

      Returns 1 if synchronisation was attempted, 0 if it
      is in progress.



   BASES

      SysBase



   NOTES

      This function is very helpful when there is a need to
      detect when a group of tasks go to sleep.

      Do not use this function if you know that task youre
      trying to spy on never calls 'Wait()' or 'Signal()',
      either directly or indirectly and/or does not die or
      too dense signal(below 50 micros) is being delivered
      from interrupts. Machine lockup guaranteed!

      There is no way to tell whether 'Wait()' or 'Signal()'
      were called. Task may loose CPU in both cases, but
      in case of 'Signal()' it can only be detectable when
      calling task signals task not in the 'tasks' table!

      In order to stay in sync. you must call 'Forbid()' or
      'Disable()'(preferred) as soon as possible. This must
      be done right after calling this function ;-) . Then
      do what you want, except for 'Wait()' ing(directly or
      indirectly) and after that 'Permit()' or 'Enable()'.

      Task presence wont be assured! If 'tasks' does not
      correspond any tasks, this func. will return at once.

      If this function is being used from concurrent tasks
      then it will block for the period of synchronisation
      in all other tasks, even in those who have advantage
      of priority!



   SEE ALSO

      mem_dosynctask()



   EXAMPLE

      See 'testsuite/dosynctask-test.c' for more details.



   BUGS

      See 'mem_dosynctask()'.



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