Uniprocessor implementation of nested mutex problem of priority inversion.

[Saurabh Gadia]

Hi,

Following is the result of spsem04 test without the patch:

*** BEGIN OF TEST SPSEM 4 ***

init: S0 created

init: S1 created

init: TA01 created with priority 36

init: TA02 created with priority 34

init: TA03 created with priority 32

TA01: started with priority 36

TA01: priority 36, holding S0

TA02: started with priority 34

TA02: priority 34, holding S1

TA01: priority 34, holding S0 and now creating TA03

TA03: started with priority 32

TA01: priority 34 Releasing s0 (This is priority inheritance problem as
TA02 waits on mutex held by TA01 and has higher priority than TA01. TA03
just promotes the priority TA02.)

TA02: priority 32, holding S1,S0

TA02: priority 32 before releasing S0

TA02: priority 32 after releasing S0

TA02: priority 32 before releasing S1

TA03: priority 32, holding S1

TA03: priority 32

TA03: suspending

TA02: priority 34 after releasing S1

TA02: suspending

TA01: priority 36

TA01: exiting
*** END OF TEST SPSEM 4 ***

You can see the difference in highlighted portions of both outputs.

Thanks,

Saurabh Gadia

On Thu, Aug 13, 2015 at 8:17 AM, Saurabh Gadia <gadia at usc.edu> wrote:

> Ok. I will mail you back soon.
>
>
> On Thursday, August 13, 2015, Gedare Bloom <gedare at rtems.org> wrote:
>
>> Saurabh,
>>
>> Please pull from rtems.git again, create a new branch from 'master',
>> and apply your changes to the branch. It's too hard to review code
>> that is not all by itself on a branch.
>>
>> Gedare
>>
>> On Thu, Aug 13, 2015 at 5:28 AM, Saurabh Gadia <gadia at usc.edu> wrote:
>> > Hi,
>> >
>> > I have implemented uniprocessor model of nested mutex problem in rtems.
>> its
>> > still in basic form. I tried to multiplex it with the existing solution
>> but
>> > was finding hard time. To push ahead, I decided to have separate
>> functions
>> > for uniprocessor and SMP(kept default behavior) and with your review
>> > comments will know what to do. Following is the link for the git repo:
>> > https://github.com/saurabhgadia4/rtems/commits/master and its JPF
>> branch:
>> >
>> https://github.com/saurabhgadia4/lock-model/blob/uniproc-new1/rtems/Mutex.java
>> >
>> > I have also tested spsem01, 02, 03 test cases. Following are the links
>> for
>> > the test case results which states output before solution and after
>> applying
>> > the solution. I am still not getting whether my code is passing spsem03
>> test
>> > or not. How can I verify that?
>> >
>> > Test Case Link:
>> >
>> https://drive.google.com/folderview?id=0B44HRKVuGCkFfnFDVmxqQzZZUzljNUg4YmVPZmEybEp2Q0NNclpvS2FvemZ4Tm5Xa19nemM&usp=sharing
>> >
>> > Thanks,
>> >
>> > Saurabh Gadia
>>
>
>
> --
> Thanks,
>
> Saurabh Gadia
>
>
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