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Add _Thread_queue_Extract_with_return_code(). On SMP this sequence in
_Thread_queue_Process_timeout() was broken:
[...]
/*
* After we enable interrupts here, a lot may happen in the
* meantime, e.g. nested interrupts may release the resource that
* times out here. So we enter _Thread_queue_Extract()
* speculatively. Inside this function we check the actual status
* under ISR disable protection. This ensures that exactly one
* executing context performs the extract operation (other parties
* may call _Thread_queue_Dequeue()). If this context won, then
* we have a timeout.
*
* We can use the_thread_queue pointer here even if
* the_thread->Wait.queue is already set to NULL since the extract
* operation will only use the thread queue discipline to select
* the right extract operation. The timeout status is set during
* thread queue initialization.
*/
we_did_it = _Thread_queue_Extract( the_thread_queue, the_thread );
if ( we_did_it ) {
the_thread->Wait.return_code = the_thread_queue->timeout_status;
}
[...]
In case _Thread_queue_Extract() successfully extracted a thread, then
this thread may start execution on a remote processor immediately and
read the the_thread->Wait.return_code before we update it here with the
timeout status. Thus it observes a successful operation even if it
timed out.
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The _Thread_queue_Process_timeout() operation had several race
conditions in the event of nested interrupts. Protect the critical
sections via disabled interrupts.
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Move implementation specific parts of tqdata.h, threadq.h and
threadq.inl into new header file threadqimpl.h. The threadq.h contains
now only the application visible API.
Delete tqdata.h.
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Move implementation specific parts of thread.h and thread.inl into new
header file threadimpl.h. The thread.h contains now only the
application visible API.
Remove superfluous header file includes from various files.
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This patch is a task from GCI 2012 which improves the Doxygen
comments in the RTEMS source.
http://www.google-melange.com/gci/task/view/google/gci2012/7985215
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Script does what is expected and tries to do it as
smartly as possible.
+ remove occurrences of two blank comment lines
next to each other after Id string line removed.
+ remove entire comment blocks which only exited to
contain CVS Ids
+ If the processing left a blank line at the top of
a file, it was removed.
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* score/Makefile.am, score/include/rtems/score/threadq.h,
score/inline/rtems/score/threadq.inl: _Thread_queue_Process_timeout
was really too complex to be inlined.
* score/src/threadqprocesstimeout.c: New file.
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