[ECOS] fatal error:set_priority()

[张 亮]

Dear nickg,
        
      about changing a thread's priority in ecos,I have some different 
opinion:
  ecos method:
        remove  "this" thread from queue which the thread exists in ,then 
set new
priority and add the thread into new ready queue or old quque.if need 
reschedule,
set need_sched and unlock()

 questions:
        
         1 if this thread 's state==RUNNING(  current thread or not current 
thread) and owned a mutex,and ecos set a lower priority,then,all thread 
waiting mutex were waiting long term undetermined!
         2 if this thread 's state!=RUNNING but sleeping for a mutex, and 
ecos set a highest priority in its queue,why not  priority inherent occurs?
         3not only mutex,but other critical resource:files,device,the same 
problem exists!
  suggestion:
         this topic is complex,
        i think the function:set_priority() should be called with more 
limitations:
          it should be called only for suspended thread,reset thread. 
          





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