[RTEMS Project] #2371: Add support for POSIX robust mutexes

[RTEMS trac]

#2371: Add support for POSIX robust mutexes
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 Reporter:  joel.sherrill  |      Owner:
     Type:  enhancement    |     Status:  new
 Priority:  normal         |  Milestone:  5.0
Component:  cpukit         |    Version:  4.11
 Severity:  normal         |   Keywords:  mutex, posix, robust, consistent
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 In 2006, the POSIX standard added a robust mode for mutexes. When a thread
 that owns a mutex is deleted, the mutex with the robust attribute is
 marked as being in an inconsistent state.

 It is covered by the following APIs:

 * pthread_mutexattr_setrobust
 * pthread_mutexattr_getrobust
 * pthread_mutex_consistent

 This statement from the pthread.h definition page gives a summary:

 ''The PTHREAD_MUTEX_ROBUST and PTHREAD_MUTEX_STALLED symbols and the
 pthread_mutex_consistent(), pthread_mutexattr_getrobust(), and
 pthread_mutexattr_setrobust() functions are added from The Open Group
 Technical Standard, 2006, Extended API Set Part 2.''

 Pages to reference:

 * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/pthread.h.html
 *
 http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutex_consistent.html
 *
 http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutexattr_getrobust.html

 As a minimum this capability should be available in the POSIX API.
 Although, it is undefined how it may be supported in the Classic API, it
 should be supported in the Classic API as well.

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Ticket URL: <http://devel.rtems.org/ticket/2371>
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