[ECOS] fatal error:set_priority()

[=?gb2312?B?1cUgwcE=?= <johnsonest at hotmail dot com>]

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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