[troll] Fine, so what is a "complete" RTOS?

Vladimir Vassilevsky wrote:
> 
> 
> Chris H wrote:
>> In message <hts8be$oig$1@speranza.aioe.org>, D Yuniskis
>> <not.going.to.be@seen.com> writes
>>
>>> I see the basic services that an *embedded* OS should support
>>> to include:
>>> - memory management
>>> - CPU management
>>> - time management
>>
>>
>> Yes to the above.
> 
> A C/C++ compiler should provide built-in interrupt safe functions to 
> create and switch contexts. Everything else you do yourself or use 
> libraries of your preference.
> 

That would be /very/ nice.

It's not quite enough, though.  It should also provide an atomic 
compare-and-swap instruction (or built-in function, if the cpu does not 
have a CAS instruction).  That would let you build atomic accesses, 
semaphores, mutexes, etc., as a standard C library.  Memory barrier and 
interrupt enable, disable, save and restore built-ins would also be 
useful - these normally have to be done using inline assembly.