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Update #2554.
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Use a red-black tree instead of delta chains.
Close #2344.
Update #2554.
Update #2555.
Close #2606.
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This avoids potential dead code in _Thread_Handler(). It gets rid of
the dangerous function pointer casts.
Update #2514.
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Remove the thread action handler parameter from
_Thread_Action_initialize() and instead set it later in
_Thread_Add_post_switch_action(). This avoids a dependency on the
thread action handler via the thread initialization.
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This enables external libraries to use thread locks since they are
independent of the actual RTEMS build configuration, e.g. profiling
enabled or disabled.
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These SMP lock statistics are used for all lock objects that lack a
storage space for the statistics. Examples are lock objects used in
external libraries which are independent of the actual RTEMS build
configuration.
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Move the storage for the thread queue heads to the threads. Each thread
provides a set of thread queue heads allocated from a dedicated memory
pool. In case a thread blocks on a queue, then it lends its heads to
the queue. In case the thread unblocks, then it takes a free set of
threads from the queue. Since a thread can block on at most one queue
this works. This mechanism is used in FreeBSD. The motivation for this
change is to reduce the memory demands of the synchronization objects.
On a 32-bit uni-processor configuration the Thread_queue_Control size is
now 8 bytes, compared to 64 bytes in RTEMS 4.10 (other changes reduced
the size as well).
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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.
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Add watchdog header parameter to _Watchdog_Remove() to be in line with
the other operations. Add _Watchdog_Remove_ticks() and
_Watchdog_Remove_seconds() for convenience.
Update #2307.
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Update #2273.
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Deliver the POSIX signals after the thread state was updated to avoid
race-conditions on SMP configurations.
Update #2273.
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Close the thread object in _Thread_Make_zombie() so that all blocking
operations that use _Thread_Get() in the corresponding release directive
can find a terminating thread and can complete the operation.
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Replace _Scheduler_Allocate() with _Scheduler_Node_initialize(). Remove
the return status and thus the node initialization must be always
successful.
Rename _Scheduler_Free() to _Scheduler_Node_destroy().
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Enable usage of _Thread_Set_life_protection() in thread dispatch
critical sections. This can be used to enable the thread
life-protection with thread dispatching disabled and then enable thread
dispatching.
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Use separate state for thread restart.
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The current implementation of task migration in RTEMS has some
implications with respect to the interrupt latency. It is crucial to
preserve the system invariant that a task can execute on at most one
processor in the system at a time. This is accomplished with a boolean
indicator in the task context. The processor architecture specific
low-level task context switch code will mark that a task context is no
longer executing and waits that the heir context stopped execution
before it restores the heir context and resumes execution of the heir
task. So there is one point in time in which a processor is without a
task. This is essential to avoid cyclic dependencies in case multiple
tasks migrate at once. Otherwise some supervising entity is necessary to
prevent life-locks. Such a global supervisor would lead to scalability
problems so this approach is not used. Currently the thread dispatch is
performed with interrupts disabled. So in case the heir task is
currently executing on another processor then this prolongs the time of
disabled interrupts since one processor has to wait for another
processor to make progress.
It is difficult to avoid this issue with the interrupt latency since
interrupts normally store the context of the interrupted task on its
stack. In case a task is marked as not executing we must not use its
task stack to store such an interrupt context. We cannot use the heir
stack before it stopped execution on another processor. So if we enable
interrupts during this transition we have to provide an alternative task
independent stack for this time frame. This issue needs further
investigation.
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The thread control block contains fields that point to application
configuration dependent memory areas, like the scheduler information,
the API control blocks, the user extension context table, the RTEMS
notepads and the Newlib re-entrancy support. Account for these areas in
the configuration and avoid extra workspace allocations for these areas.
This helps also to avoid heap fragementation and reduces the per thread
memory due to a reduced heap allocation overhead.
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Do not allocate the scheduler control structures from the workspace.
This is a preparation step for configuration of clustered/partitioned
schedulers on SMP.
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Scheduler operations must be free of a global scheduler context to
enable partitioned/clustered scheduling.
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Issue a fatal error in case a thread is deleted which still owns
resources (e.g. a binary semaphore with priority inheritance or ceiling
protocol). The resource count must be checked quite late since RTEMS
task variable destructors, POSIX key destructors, POSIX cleanup handler,
the Newlib thread termination extension or other thread termination
extensions may release resources. In this context it would be quite
difficult to return an error status to the caller.
An alternative would be to place threads with a non-zero resource count
not on the zombie chain. Thus we have a resource leak instead of a
fatal error. The terminator thread can see this error if we return an
RTEMS_RESOURCE_IN_USE status for the rtems_task_delete() for example.
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This fixes an integer underflow problem in case resources are released
after a thread restart.
Add new test sptests/spthreadlife01.
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The thread deletion is now supported on SMP.
This change fixes the following PRs:
PR1814: SMP race condition between stack free and dispatch
PR2035: psxcancel reveals NULL pointer access in _Thread_queue_Extract()
The POSIX cleanup handler are now called in the right context (should be
called in the context of the terminating thread).
http://pubs.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_09.html
Add a user extension the reflects a thread termination event. This is
used to reclaim the Newlib reentrancy structure (may use file
operations), the POSIX cleanup handlers and the POSIX key destructors.
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Replace _Thread_Reset() with _Thread_Start_life_change(). This function
can be later used for the _Thread_Close() implementation.
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The executing thread will be later used for a common implementation with
_Thread_Close().
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Run the thread restart extensions in the context of the restarted
thread. Run them with thread dispatching enabled.
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Move thread entry parameters out of _Thread_Reset() to enable
re-usablity of this function.
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The thread restart is now supported on SMP. New test
smptests/smpthreadlife01.
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Use a per-CPU thread dispatch disable level. So instead of one global
thread dispatch disable level we have now one instance per processor.
This is a major performance improvement for SMP. On non-SMP
configurations this may simplifiy the interrupt entry/exit code.
The giant lock is still present, but it is now decoupled from the thread
dispatching in _Thread_Dispatch(), _Thread_Handler(),
_Thread_Restart_self() and the interrupt entry/exit. Access to the
giant lock is now available via _Giant_Acquire() and _Giant_Release().
The giant lock is still implicitly acquired via
_Thread_Dispatch_decrement_disable_level().
The giant lock is only acquired for high-level operations in interrupt
handlers (e.g. release of a semaphore, sending of an event).
As a side-effect this change fixes the lost thread dispatch necessary
indication bug in _Thread_Dispatch().
A per-CPU thread dispatch disable level greatly simplifies the SMP
support for the interrupt entry/exit code since no spin locks have to be
acquired in this area. It is only necessary to get the current
processor index and use this to calculate the address of the own per-CPU
control. This reduces the interrupt latency considerably.
All elements for the interrupt entry/exit code are now part of the
Per_CPU_Control structure: thread dispatch disable level, ISR nest level
and thread dispatch necessary. Nothing else is required (except CPU
port specific stuff like on SPARC).
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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.
https://google-melange.appspot.com/gci/task/view/google/gci2012/7978208
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This file contains the parts of <rtems/score/userext.h> that are only
necessary for the RTEMS implementation.
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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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* include/rtems/bspIo.h, include/rtems/concat.h, include/rtems/irq.h,
score/cpu/i386/rtems/score/idtr.h,
score/cpu/powerpc/rtems/powerpc/registers.h,
score/src/objectidtoname.c, score/src/schedulerpriorityblock.c,
score/src/schedulerpriorityschedule.c,
score/src/schedulerpriorityunblock.c,
score/src/schedulerpriorityyield.c, score/src/thread.c,
score/src/threadchangepriority.c, score/src/threadclearstate.c,
score/src/threadclose.c, score/src/threadcreateidle.c,
score/src/threaddelayended.c, score/src/threaddispatch.c,
score/src/threadget.c, score/src/threadhandler.c,
score/src/threadinitialize.c, score/src/threadloadenv.c,
score/src/threadready.c, score/src/threadreset.c,
score/src/threadrestart.c, score/src/threadresume.c,
score/src/threadsetpriority.c, score/src/threadsetstate.c,
score/src/threadsettransient.c, score/src/threadstackallocate.c,
score/src/threadstackfree.c, score/src/threadstart.c,
score/src/threadstartmultitasking.c, score/src/threadsuspend.c,
score/src/threadtickletimeslice.c, score/src/threadyieldprocessor.c:
Fix typo where license said found in found in.
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* libmisc/monitor/monitor.h, rtems/include/rtems/rtems/tasks.h,
score/include/rtems/score/thread.h, score/src/threadreset.c,
score/src/threadrestart.c, score/src/threadstart.c: New type
Thread_Entry_numeric_type for numeric arguments in thread entry
functions with at least one numeric argument.
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* score/src/Unlimited.txt, score/src/chain.c, score/src/coremsg.c,
score/src/coremsgbroadcast.c, score/src/coremsgclose.c,
score/src/coremsgflush.c, score/src/coremsgflushsupp.c,
score/src/coremsgseize.c, score/src/coremsgsubmit.c,
score/src/coremutex.c, score/src/coremutexflush.c,
score/src/coresem.c, score/src/coresemflush.c, score/src/coretod.c,
score/src/coretodtickle.c, score/src/coretodtoseconds.c,
score/src/coretodvalidate.c, score/src/heap.c,
score/src/heapallocate.c, score/src/heapextend.c,
score/src/heapfree.c, score/src/heapsizeofuserarea.c,
score/src/interr.c, score/src/iterateoverthreads.c,
score/src/mpci.c, score/src/object.c, score/src/objectallocate.c,
score/src/objectallocatebyindex.c, score/src/objectclearname.c,
score/src/objectcomparenameraw.c,
score/src/objectcomparenamestring.c, score/src/objectcopynameraw.c,
score/src/objectcopynamestring.c,
score/src/objectextendinformation.c, score/src/objectfree.c,
score/src/objectget.c, score/src/objectgetbyindex.c,
score/src/objectgetisr.c, score/src/objectgetnoprotection.c,
score/src/objectidtoname.c, score/src/objectinitializeinformation.c,
score/src/objectmp.c, score/src/objectnametoid.c,
score/src/objectshrinkinformation.c, score/src/thread.c,
score/src/threadcreateidle.c, score/src/threadget.c,
score/src/threadidlebody.c, score/src/threadinitialize.c,
score/src/threadmp.c, score/src/threadq.c,
score/src/threadqdequeuepriority.c,
score/src/threadqenqueuepriority.c,
score/src/threadqfirstpriority.c, score/src/threadqflush.c,
score/src/threadreset.c, score/src/threadrestart.c,
score/src/threadsettransient.c, score/src/threadstackallocate.c,
score/src/threadstart.c, score/src/userext.c,
score/src/watchdoginsert.c, score/src/wkspace.c: Convert to using
c99 fixed size types.
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* include/rtems/debug.h, include/rtems/seterr.h,
include/rtems/system.h, include/rtems/score/address.h,
include/rtems/score/apiext.h, include/rtems/score/apimutex.h,
include/rtems/score/bitfield.h, include/rtems/score/chain.h,
include/rtems/score/context.h, include/rtems/score/copyrt.h,
include/rtems/score/coremsg.h, include/rtems/score/coremutex.h,
include/rtems/score/coresem.h, include/rtems/score/heap.h,
include/rtems/score/interr.h, include/rtems/score/isr.h,
include/rtems/score/mpci.h, include/rtems/score/mppkt.h,
include/rtems/score/object.h, include/rtems/score/objectmp.h,
include/rtems/score/priority.h, include/rtems/score/stack.h,
include/rtems/score/states.h, include/rtems/score/sysstate.h,
include/rtems/score/thread.h, include/rtems/score/threadmp.h,
include/rtems/score/threadq.h, include/rtems/score/tod.h,
include/rtems/score/tqdata.h, include/rtems/score/userext.h,
include/rtems/score/watchdog.h, include/rtems/score/wkspace.h,
inline/rtems/score/address.inl, inline/rtems/score/chain.inl,
inline/rtems/score/coremsg.inl, inline/rtems/score/coremutex.inl,
inline/rtems/score/coresem.inl, inline/rtems/score/heap.inl,
inline/rtems/score/isr.inl, inline/rtems/score/mppkt.inl,
inline/rtems/score/object.inl, inline/rtems/score/objectmp.inl,
inline/rtems/score/priority.inl, inline/rtems/score/stack.inl,
inline/rtems/score/states.inl, inline/rtems/score/sysstate.inl,
inline/rtems/score/thread.inl, inline/rtems/score/threadmp.inl,
inline/rtems/score/tod.inl, inline/rtems/score/tqdata.inl,
inline/rtems/score/userext.inl, inline/rtems/score/watchdog.inl,
inline/rtems/score/wkspace.inl, macros/rtems/score/address.inl,
macros/rtems/score/chain.inl, macros/rtems/score/coremsg.inl,
macros/rtems/score/coremutex.inl, macros/rtems/score/coresem.inl,
macros/rtems/score/heap.inl, macros/rtems/score/isr.inl,
macros/rtems/score/mppkt.inl, macros/rtems/score/object.inl,
macros/rtems/score/objectmp.inl, macros/rtems/score/priority.inl,
macros/rtems/score/stack.inl, macros/rtems/score/states.inl,
macros/rtems/score/sysstate.inl, macros/rtems/score/thread.inl,
macros/rtems/score/threadmp.inl, macros/rtems/score/tod.inl,
macros/rtems/score/tqdata.inl, macros/rtems/score/userext.inl,
macros/rtems/score/watchdog.inl, macros/rtems/score/wkspace.inl,
src/apiext.c, src/chain.c, src/coremsg.c, src/coremsgbroadcast.c,
src/coremsgclose.c, src/coremsgflush.c, src/coremsgflushsupp.c,
src/coremsgflushwait.c, src/coremsginsert.c, src/coremsgseize.c,
src/coremsgsubmit.c, src/coremutex.c, src/coremutexflush.c,
src/coremutexseize.c, src/coremutexsurrender.c, src/coresem.c,
src/coresemflush.c, src/coresemseize.c, src/coresemsurrender.c,
src/coretod.c, src/coretodset.c, src/coretodtickle.c,
src/coretodtoseconds.c, src/coretodvalidate.c, src/heap.c,
src/heapallocate.c, src/heapextend.c, src/heapfree.c,
src/heapgetinfo.c, src/heapsizeofuserarea.c, src/heapwalk.c,
src/interr.c, src/isr.c, src/iterateoverthreads.c, src/mpci.c,
src/object.c, src/objectallocate.c, src/objectallocatebyindex.c,
src/objectclearname.c, src/objectcomparenameraw.c,
src/objectcomparenamestring.c, src/objectcopynameraw.c,
src/objectcopynamestring.c, src/objectextendinformation.c,
src/objectfree.c, src/objectget.c, src/objectgetbyindex.c,
src/objectgetisr.c, src/objectgetnext.c, src/objectgetnoprotection.c,
src/objectidtoname.c, src/objectinitializeinformation.c,
src/objectmp.c, src/objectnametoid.c, src/objectshrinkinformation.c,
src/thread.c, src/threadchangepriority.c, src/threadclearstate.c,
src/threadclose.c, src/threadcreateidle.c, src/threaddelayended.c,
src/threaddispatch.c, src/threadevaluatemode.c, src/threadget.c,
src/threadhandler.c, src/threadidlebody.c, src/threadinitialize.c,
src/threadloadenv.c, src/threadmp.c, src/threadq.c,
src/threadqdequeue.c, src/threadqdequeuefifo.c,
src/threadqdequeuepriority.c, src/threadqenqueue.c,
src/threadqenqueuefifo.c, src/threadqenqueuepriority.c,
src/threadqextract.c, src/threadqextractfifo.c,
src/threadqextractpriority.c, src/threadqextractwithproxy.c,
src/threadqfirst.c, src/threadqfirstfifo.c,
src/threadqfirstpriority.c, src/threadqflush.c, src/threadqtimeout.c,
src/threadready.c, src/threadreset.c, src/threadresettimeslice.c,
src/threadrestart.c, src/threadresume.c, src/threadrotatequeue.c,
src/threadsetpriority.c, src/threadsetstate.c,
src/threadsettransient.c, src/threadstackallocate.c,
src/threadstackfree.c, src/threadstart.c,
src/threadstartmultitasking.c, src/threadsuspend.c,
src/threadtickletimeslice.c, src/threadyieldprocessor.c,
src/userext.c, src/watchdog.c, src/watchdogadjust.c,
src/watchdoginsert.c, src/watchdogremove.c, src/watchdogtickle.c,
src/wkspace.c: URL for license changed.
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Working Group. Included are tests.
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split into one function per file, this will decrease the size of executables.
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