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core: mutexes memorize holding thread id#4555

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Kijewski wants to merge 4 commits intoRIOT-OS:masterfrom
Kijewski:issue-4494
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core: mutexes memorize holding thread id#4555
Kijewski wants to merge 4 commits intoRIOT-OS:masterfrom
Kijewski:issue-4494

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@Kijewski Kijewski commented Dec 28, 2015

Rationale: see #4494. Closes #4494.

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@Kijewski
core: fix mutex debug messages
558f211
@Kijewski
core: unify mutex_lock and mutex_trylock
684fa8b 
The code is much clearer IMO. atomic_set_to_one() uses disableIRQ() for
most platforms, so using to causes an overhead.
@Kijewski
core: no needless pointer-casting in mutex queue
e06ee95
@Kijewski
core: mutexes memorize holding thread id
abc3429 
Closes #4494
@Kijewski Kijewski added Area: core Area: RIOT kernel. Handle PRs marked with this with care! Impact: minor The PR is small in size and might only require a quick look of a knowledgeable reviewer CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR labels Dec 28, 2015
@Kijewski Kijewski added this to the Release 2016.03 milestone Dec 28, 2015
Kijewski
Kijewski reviewed Dec 28, 2015
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core/include/mutex.h
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@Kijewski Kijewski Dec 28, 2015

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Should I return the information whether the caller had to wait to get hold of the mutex? The API change would not affect any existing code, but I cannot think of a case when you would need this information.

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Same here... It would (slightly) hurt performance in all cases, and can maybe be emulated by calling first mutex_trylock, then mutex_lock.

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kaspar030 commented Dec 29, 2015

Nice. I would have thought that always disabling IRQs would hurt non-locked case, but it turns out that it's a lot faster this way (330k vs 480k locks/second on sam r21).

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kaspar030 commented Dec 29, 2015

But IMHO the PR title is misleading, not using atomics is not a trivial change, and has nothing to do with storing the holder's PID. Not storing the PID (using this PR's code but using 0 and 1 instead of PID) saves another 16 bytes code (on cortex M0).

edit
Using 0/1 instead of PID makes the unlocked case slightly faster (~7%).

@Kijewski Would you mind seperating those changes?

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Kijewski commented Dec 29, 2015

Please test https://github.com/Kijewski/RIOT/commit/849e7f85fda53bcce62148dd17ff9a2a6ec2ccfd.

@kaspar030 kaspar030 mentioned this pull request Dec 29, 2015
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kaspar030 commented Dec 29, 2015

Please test Kijewski@849e7f8.

Hangs somewhere for me.

Could you check out #4557? I had a branch lying around which drops mutex' dependency on priority_queue. I've integrated your ideas from this PR. Result is 4% more speed, 20 bytes code saved and sizeof(mutex) == sizeof(void*).

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OlegHahm commented Dec 29, 2015

IMO any non-trivial change to the core shouldn't be labeled as "minor".

@Kijewski Kijewski removed the Impact: minor The PR is small in size and might only require a quick look of a knowledgeable reviewer label Dec 29, 2015
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Kijewski commented Dec 29, 2015

Closed in favor of #4557.

@Kijewski Kijewski closed this Dec 29, 2015
@Kijewski Kijewski deleted the issue-4494 branch December 29, 2015 21:03
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