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Directly use "static inline" which is available in C99 and later. This brings
the RTEMS implementation closer to standard C.
Close #3935.
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Updates #3053.
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Move all rtems_scheduler_* directives to the new header file
<rtems/rtems/scheduler.h>. Add a Scheduler Manager API and
implementation group.
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We do not need all the checks if we have a valid indentifier to a thread
class object.
Using the new _Thread_Get_objects_information() instead of the inline
function _Thread_Get_objects_information_by_id() avoids dead code since
the identifier in a thread control is always valid and the return NULL
path in _Thread_Get_objects_information_by_id() would be dead code. The
_Thread_Get_objects_information_by_id() should be an inline function
since it is used by _Thread_Get() and thus performance critical. Static
analyzers which cannot derive that the identifier in a thread control is
always valid, may find a potential NULL pointer access (or otherwise
find dead code).
The identifier in an object control is always valid, see
_Objects_Initialize_information() and _Objects_Extend_information().
Move _RTEMS_tasks_Free() to the only source file which calls this
function.
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Use common phrases for the file brief descriptions.
Update #3706.
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Rename Classic API top-level group from Classic to RTEMSImplClassic.
Use RTEMSImplClassic as a prefix for the subgroups. Change the group
names to be in line with the API group names. Use common phrases for
the group brief descriptions.
Update #3706.
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Use a top-level implementation group to gather implementation related
files. The use of "Impl" is shorter and matches with the *impl.h file
names.
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In contrast to rtems_task_create() this function constructs a task with
a user-provided task storage area. The new directive uses a
configuration structure instead of individual parameters.
Add RTEMS_TASK_STORAGE_SIZE() to calculate the recommended size of a
task storage area based on the task attributes and the size dedicated to
the task stack and thread-local storage. This macro may allow future
extensions without breaking the API.
Add application configuration option
CONFIGURE_MINIMUM_TASKS_WITH_USER_PROVIDED_STORAGE to adjust RTEMS
Workspace size estimate.
Update #3959.
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Update #3706.
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Statically allocate the objects information together with the initial
set of objects either via <rtems/confdefs.h>. Provide default object
informations with zero objects via librtemscpu.a. This greatly
simplifies the workspace size estimate. RTEMS applications which do not
use the unlimited objects option are easier to debug since all objects
reside now in statically allocated objects of the right types.
Close #3621.
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Update #3598.
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A speciality of the RTEMS build system was the make preinstall step. It
copied header files from arbitrary locations into the build tree. The
header files were included via the -Bsome/build/tree/path GCC command
line option.
This has at least seven problems:
* The make preinstall step itself needs time and disk space.
* Errors in header files show up in the build tree copy. This makes it
hard for editors to open the right file to fix the error.
* There is no clear relationship between source and build tree header
files. This makes an audit of the build process difficult.
* The visibility of all header files in the build tree makes it
difficult to enforce API barriers. For example it is discouraged to
use BSP-specifics in the cpukit.
* An introduction of a new build system is difficult.
* Include paths specified by the -B option are system headers. This
may suppress warnings.
* The parallel build had sporadic failures on some hosts.
This patch removes the make preinstall step. All installed header
files are moved to dedicated include directories in the source tree.
Let @RTEMS_CPU@ be the target architecture, e.g. arm, powerpc, sparc,
etc. Let @RTEMS_BSP_FAMILIY@ be a BSP family base directory, e.g.
erc32, imx, qoriq, etc.
The new cpukit include directories are:
* cpukit/include
* cpukit/score/cpu/@RTEMS_CPU@/include
* cpukit/libnetworking
The new BSP include directories are:
* bsps/include
* bsps/@RTEMS_CPU@/include
* bsps/@RTEMS_CPU@/@RTEMS_BSP_FAMILIY@/include
There are build tree include directories for generated files.
The include directory order favours the most general header file, e.g.
it is not possible to override general header files via the include path
order.
The "bootstrap -p" option was removed. The new "bootstrap -H" option
should be used to regenerate the "headers.am" files.
Update #3254.
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Introduce map/unmap priority scheduler operations to map thread priority
values from/to the user domain to/from the scheduler domain. Use the
map priority operation to validate the thread priority. The EDF
schedulers use this new operation to distinguish between normal
priorities and priorities obtain through a job release.
Update #2173.
Update #2556.
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Use same structure as POSIX API for thread priority conversion to/from
SuperCore.
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Update #2494.
Update #2555.
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Update #2408.
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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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Per task variables are inherently unsafe in SMP systems. This
patch disables them from the build and adds warnings in the
appropriate documentation and configuration sections.
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Use allocator mutex for objects allocate/free. This prevents that the
thread dispatch latency depends on the workspace/heap fragmentation.
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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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Move implementation specific parts of object.h and object.inl into new
header file objectimpl.h. The object.h contains now only the
application visible API.
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Move implementation specific parts of tasks.h and tasks.inl into new
header file tasksimpl.h. The tasks.h contains now only the application
visible API.
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