Gsoc2013-Atomic_Project-Status

[Deng Hengyi]

Hi all,

This is a brief week status report about my GSOC2013 project ----- atomic ops support for RTEMS.

DONE:
1. Discuss with mentor to define the new atomic API. 
2. Implement a generic architecture-depend part atomic ops based on std atomic.h
3. Test on ARM architecture realview_pbx_a9_qemu_smp BSP.
4. Add conditional check for atomic support when build.

TODO:
1. Clean up old atomic related files
2. Design new atomic test case based on new API and implementation. 

Blog updates:
http://weiy.github.io

WeiY
Best Regards

在 2013-6-24，下午4:16，Sebastian Huber <sebastian.huber at embedded-brains.de> 写道：

> Hello Wei,
> 
> great, you have now a good development environment.
> 
> I work currently on a requirements document for the atomic operations API.  It was not really clear what we need for the SMP support in RTEMS, but since I worked on this topic the last couple of months I have now a better understanding of the requirements.
> 
> Hopefully we can implement the ticket locks for example in
> 
> http://git.rtems.org/rtems/tree/cpukit/score/cpu/powerpc/rtems/score/cpusmplock.h
> http://git.rtems.org/rtems/tree/cpukit/score/cpu/arm/rtems/score/cpusmplock.h
> 
> with the atomic operations and get sufficiently efficient code.
> 
> Other applications are a phase-fair read-write lock (for example to read and update the ticks since boot), a sense barrier or lock-free updates of heir to executing thread changes.
> 
> On 06/22/2013 03:59 PM, Deng Hengyi wrote:
>> Hi all,
>> 
>> This is a brief status report about my GSOC2013 project ----- atomic ops support for RTEMS.
>> 
>> DONE:
>> 1. Setup the development environment including the latest rtems git repo, rtems-test git repo and qemu for realview_pbx_a9.
>> 2. Build the latest rtems toolchains which include the stdatomic.h support.
>> 3. Modify the existing atomic API to be compatible with C11 std atomic.h.
>> 4. Replace the existing atomic SMP implementation with stdatomic.h.
>> 5. Build the spatomic and smpatomic test case for realview_pbx_a9 SMP and UP.
>> 6. All the spatomic and smpatomic have been passed.
>> 7. Have submit the patches to devel list to be reviewed.
>> 
>> TODO.
>> 1. Plan to integrate the patches into mainline.
>> 2. Support the stdatomic.h for other architectures such as PowerPC, Mips and Sparc.
>> 3. Add the detection for whether support stdatomic.h for some architectures.
>> 
>> WeiY
>> Best Regards
>> 
> 
> 
> -- 
> Sebastian Huber, embedded brains GmbH
> 
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-brains.de
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> 
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