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Jan Kiszka authored Jul 29, 2015 and Philippe Gerum committed Aug 06, 2015

Trace and print the name of the relaxation reason whenever available.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

Jan Kiszka authored Jun 29, 2015 and Philippe Gerum committed Jul 06, 2015

Aligns cobalt_thread_suspend with cobalt_thread_resume and makes traces
easier readable.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

The fast path in rtdm_mutex_timedlock() was terminally broken by the
not-so-recent addition of fast locks to RTDM-based kernel mutexes. As
a matter of fact, the xnthread_try_grab() helper suffered multiple
breakages, including the lack of update to the underlying fastlock
word to reflect a successful locking operation.

To this end, we introduce xnsynch_try_acquire() which properly
attempts to grab the requested mutex on behalf of the current thread,
and call it as a drop-in replacement for xnthread_try_grab().  Callers
fall back to xnsynch_acquire() on failure to put a fast grab on the
mutex.

Since all userland processes belong to the Cobalt personality, all
syscalls have been merged into the Cobalt table.

As a consequence, all process context information maintained by the
core has moved to the cobalt_process descriptor.

With the IRQ line enable/disable operations restricted to the root
domain, interrupt handlers may not invoke xnintr_disable() directly to
shut down the interrupt line.

To support this requirement, we add an explicit disabled state to the
interrupt descriptor, which the handler may turn on by returning the
new XN_IRQ_DISABLE operation status. In response, the core disables
the descriptor, shutting down the interrupt line in the same move
instead of unmasking it on return from the interrupt context.

XN_IRQ_DISABLE is exposed by RTDM as RTDM_IRQ_DISABLE.

As a consequence of this change, XN_ISR_NOENABLE was dropped as we
have no in-tree client which need such semantics anymore.

At this chance, various naming and documentation fixes have been
applied.

Timer name and handler name are redundant. Drop the latter, but assign
it as the timer's default name until xntimer_set_name() is called.

Rebase trace statements in the Cobalt core over the generic tracepoint
API. A few former trace markers which did not help in analysing the
dynamic behavior of the system have been dropped in the process.

This work is originally based on Jan Kiszka's trace events conversion
patch series for Xenomai 2.6.