456c6daa9f
Summary of what this includes:
initialization:
Copy from nano_init.c, with the following changes:
- the main thread is the continuation of the init thread, but an idle
thread is created as well
- _main() initializes threads in groups and starts the EXE group
- the ready queues are initialized
- the main thread is marked as non-essential once the system init is
done
- a weak main() symbol is provided if the application does not provide a
main() function
scheduler:
Not an exhaustive list, but basically provide primitives for:
- adding/removing a thread to/from a wait queue
- adding/removing a thread to/from the ready queue
- marking thread as ready
- locking/unlocking the scheduler
- instead of locking interrupts
- getting/setting thread priority
- checking what state (coop/preempt) a thread is currenlty running in
- rescheduling threads
- finding what thread is the next to run
- yielding/sleeping/aborting sleep
- finding the current thread
threads:
- Add operationns on threads, such as creating and starting them.
standardized handling of kernel object return codes:
- Kernel objects now cause _Swap() to return the following values:
0 => operation successful
-EAGAIN => operation timed out
-Exxxxx => operation failed for another reason
- The thread's swap_data field can be used to return any additional
information required to complete the operation, such as the actual
result of a successful operation.
timeouts:
- same as nano timeouts, renamed to simply 'timeouts'
- the kernel is still tick-based, but objects take timeout values in
ms for forward compatibility with a tickless kernel.
semaphores:
- Port of the nanokernel semaphores, which have the same basic behaviour
as the microkernel ones. Semaphore groups are not yet implemented.
- These semaphores are enhanced in that they accept an initial count and a
count limit. This allows configuring them as binary semaphores, and also
provisioning them without having to "give" the semaphore multiple times
before using them.
mutexes:
- Straight port of the microkernel mutexes. An init function is added to
allow defining them at runtime.
pipes:
- straight port
timers:
- amalgamation of nano and micro timers, with all functionalities
intact.
events:
- re-implementation, using semaphores and workqueues.
mailboxes:
- straight port
message queues:
- straight port of microkernel FIFOs
memory maps:
- straight port
workqueues:
- Basically, have all APIs follow the k_ naming rule, and use the _timeout
subsystem from the unified kernel directory, and not the _nano_timeout
one.
stacks:
- Port of the nanokernel stacks. They can now have multiple threads
pending on them and threads can wait with a timeout.
LIFOs:
- Straight port of the nanokernel LIFOs.
FIFOs:
- Straight port of the nanokernel FIFOs.
Work by: Dmitriy Korovkin <dmitriy.korovkin@windriver.com>
Peter Mitsis <peter.mitsis@windriver.com>
Allan Stephens <allan.stephens@windriver.com>
Benjamin Walsh <benjamin.walsh@windriver.com>
Change-Id: Id3cadb3694484ab2ca467889cfb029be3cd3a7d6
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
95 lines
3.4 KiB
C
95 lines
3.4 KiB
C
/*
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* Copyright (c) 2010, 2012, 2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file
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* @brief Macros to generate structure member offset definitions
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*
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* This header contains macros to allow a nanokernel implementation to
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* generate absolute symbols whose values represents the member offsets for
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* various nanokernel structures. These absolute symbols are typically
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* utilized by assembly source files rather than hardcoding the values in
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* some local header file.
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*
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* WARNING: Absolute symbols can potentially be utilized by external tools --
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* for example, to locate a specific field within a data structure.
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* Consequently, changes made to such symbols may require modifications to the
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* associated tool(s). Typically, relocating a member of a structure merely
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* requires that a tool be rebuilt; however, moving a member to another
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* structure (or to a new sub-structure within an existing structure) may
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* require that the tool itself be modified. Likewise, deleting, renaming, or
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* changing the meaning of an absolute symbol may require modifications to a
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* tool.
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*
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* The macro "GEN_OFFSET_SYM(structure, member)" is used to generate a single
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* absolute symbol. The absolute symbol will appear in the object module
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* generated from the source file that utilizes the GEN_OFFSET_SYM() macro.
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* Absolute symbols representing a structure member offset have the following
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* form:
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*
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* __<structure>_<member>_OFFSET
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*
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* This header also defines the GEN_ABSOLUTE_SYM macro to simply define an
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* absolute symbol, irrespective of whether the value represents a structure
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* or offset.
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*
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* The following sample file illustrates the usage of the macros available
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* in this file:
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*
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* <START of sample source file: offsets.c>
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*
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* #include <gen_offset.h>
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* /@ include struct definitions for which offsets symbols are to be
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* generated @/
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*
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* #include <nano_private.h>
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* GEN_ABS_SYM_BEGIN (_OffsetAbsSyms) /@ the name parameter is arbitrary @/
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* /@ tNANO structure member offsets @/
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*
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* GEN_OFFSET_SYM (tNANO, fiber);
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* GEN_OFFSET_SYM (tNANO, task);
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* GEN_OFFSET_SYM (tNANO, current);
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* GEN_OFFSET_SYM (tNANO, nested);
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* GEN_OFFSET_SYM (tNANO, common_isp);
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*
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* GEN_ABSOLUTE_SYM (__tNANO_SIZEOF, sizeof(tNANO));
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*
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* GEN_ABS_SYM_END
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* <END of sample source file: offsets.c>
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*
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* Compiling the sample offsets.c results in the following symbols in offsets.o:
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*
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* $ nm offsets.o
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* 00000010 A __tNANO_common_isp_OFFSET
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* 00000008 A __tNANO_current_OFFSET
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* 0000000c A __tNANO_nested_OFFSET
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* 00000000 A __tNANO_fiber_OFFSET
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* 00000004 A __tNANO_task_OFFSET
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*/
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#ifndef _GEN_OFFSET_H
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#define _GEN_OFFSET_H
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#include <toolchain.h>
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#include <stddef.h>
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/* definition of the GEN_OFFSET_SYM() macros is toolchain independent */
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#define GEN_OFFSET_SYM(S, M) \
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GEN_ABSOLUTE_SYM(__##S##_##M##_##OFFSET, offsetof(S, M))
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#endif /* _GEN_OFFSET_H */
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