SMP: ISR disable/enable vs. mutual exclustion

[Sebastian Huber]

On 2013-08-20 14:59, Sebastian Huber wrote:
>
> One big issue are the RTEMS chains:
>
> http://www.rtems.org/onlinedocs/doxygen/cpukit/html/group__ClassicChains.html
>
> To make them SMP ready we have two options.
>
> 1. Instead of ISR disable/enable use ISR locks.  Advantage: not interface
> change.  Disadvantage: space overhead for user which only use the unprotected
> routines.
>
> 2. Add a new chain API, e.g. new structure rtems_chain_with_lock which provides
> a chain + ISR lock.  Advantage: you get what you need.  Disadvantage: API
> duplication.

The RTEMS Red-Black-Tree API suffers from the same problem.

http://www.rtems.org/onlinedocs/doxygen/cpukit/html/rbtree_8h.html

-- 
Sebastian Huber, embedded brains GmbH

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