This change adds rtems_printf and related functions and wraps the
RTEMS print plugin support into a user API. All references to the
plugin are removed and replaced with the rtems_printer interface.
Printk and related functions are made to return a valid number of
characters formatted and output.
The function attribute to check printf functions has been added
to rtems_printf and printk. No changes to remove warrnings are part
of this patch set.
The testsuite has been moved over to the rtems_printer. The testsuite
has a mix of rtems_printer access and direct print control via the
tmacros.h header file. The support for begink/endk has been removed
as it served no purpose and only confused the code base. The testsuite
has not been refactored to use rtems_printf. This is future work.
Rename _ISR_Disable_without_giant() into _ISR_Local_disable(). Rename
_ISR_Enable_without_giant() into _ISR_Local_enable().
This is a preparation to remove the Giant lock.
Update #2555.
Replace _Thread_Disable_dispatch() with _Thread_Dispatch_disable().
Replace _Thread_Enable_dispatch() with _Thread_Dispatch_enable().
This is a preparation to remove the Giant lock.
Update #2555.
Add _Thread_Change_life_locked() as a general function to alter the
thread life state. Use it to implement _Thread_Set_life_protection() as
a first step.
Update #2555.
Update #2626.
Added only for evaluation purposes. We have to compare the performance
against the ticket lock on the interesting platforms via
smptests/smplock01.
The following GCC shortcoming affects the MCS lock:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66867
According to the C11 and C++11 memory models only a read-modify-write
operation guarantees that we read the last value written in modification
order. Avoid the sequential consistent thread fence and instead use the
inter-processor interrupt to set the thread dispatch necessary
indicator.
Move the writes to Thread_Control::current_priority and
Thread_Control::real_priority into _Thread_Change_priority() under the
protection of the thread lock. Add a filter function to
_Thread_Change_priority() to enable specialized variants.
Avoid race conditions during a thread priority restore with the new
Thread_Control::priority_restore_hint for an important average case
optimizations used by priority inheritance mutexes.
Update #2273.
Account for priority changes of threads executing in a foreign
partition. Exchange idle threads in case a victim node uses an idle
thread and the new scheduled node needs an idle thread.
Make <rtems/score/atomic.h> available for all RTEMS configurations. Use
inline functions instead of macros. Use ISR disable/enable on
uni-processor configurations to ensure atomicity.
Update #2273.
Do not supsend self while waiting for termination since the
rtems_task_delete() may take place while the rtems_task_suspend() waits
for the Giant lock preventing delivery of the inter-processor interrupt.
The result is a suspended and terminated thread (this is a valid state,
but leads in this case to a test failure).
The previous timeout handling was flawed. In case a waiting thread
helped out the owner could use the scheduler node indefinitely long.
Update the resource tree in _MRSP_Timeout() to avoid this issue.
Bug reported by Luca Bonato.
Ensure that scheduler nodes in the SCHEDULER_HELP_ACTIVE_OWNER or
SCHEDULER_HELP_ACTIVE_RIVAL helping state are always
SCHEDULER_SMP_NODE_READY or SCHEDULER_SMP_NODE_SCHEDULED to ensure the
MrsP protocol properties.
