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Use thread wait flags for synchronization. The enqueue operation is now
part of the initial critical section. This is the key change and
enables fine grained locking on SMP for objects using a thread queue
like semaphores and message queues.
Update #2273.
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Remove thread queue parameter from _Thread_queue_Extract() since the
current thread queue is stored in the thread control block.
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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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