[ECOS] I call cyg_mbox_get in DSR, System corrupt.

[Gary Thomas]

redheart wrote:
> I firstly called cyg_mbox_get in DSR, and block certain thread
> then i called cyg_mbox_put in another thread,
> then the scheduler attempt to wake up the blocked thread
> but at the time of switching context, the system corrupt.
> 
> the debugger show that "previus frame inner to this frame (corrupt stack?)" 
> I know that call blockable function in a DSR is illegal.
> but i don'r know what resulted in the corrupt.
> 
> why?
> 

Because this is an unsafe operation and "not allowed" to
be called from a DSR.  DSRs cannot call any kernel function
which might block (because they are run anonymously, not in
any particular thread context).

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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