[riot-notifications] [RIOT-OS/RIOT] sys/xtimer/xtimer.c: _mutex_timeout() clean ups (#11807)

Julian Holzwarth notifications at github.com
Fri Jul 5 18:00:52 CEST 2019


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### Contribution description

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This pr prepares for bug fixes and improvements of `xtimer.c:xtimer_mutex_lock_timeout() ` (the tracking pr: #11660 )

This pr improves the _mutex_timeout() function. 
It uses now `sched_switch` instead of `thread_yield_higher`. (https://github.com/RIOT-OS/RIOT/pull/11660#discussion_r298597694, #11759)
Only call `sched_switch` (`thread_yield_higher` before) when the thread was unlocked.
And ensure interrupt are disabled because it modifies a mutex. (if `xtimer_set` spins the callback is executed in the thread context.)

This pr also changes the comment of `sys/include/xtimer.h: xtimer_mutex_lock_timeout()`

### Testing procedure

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`BOARD=native make -C tests/xtimer_mutex_lock timeout/ flash test`
output:

```
...
> mutex_timeout_n_spin_unlocked
starting test: xtimer mutex lock timeout
OK
> mutex_timeout_n_spin_locked
mutex_timeout_n_spin_locked
starting test: xtimer mutex lock timeout
OK
> 
```

### Issues/PRs references

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 the tracking pr: #11660
reason for sched_switch instead of thread_yield_higher: #11759, https://github.com/RIOT-OS/RIOT/pull/11660#discussion_r298597694
You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/11807

-- Commit Summary --

  * sys/include/xtimer.h: xtimer_mutex_lock_timeout() change comment
  * xtimer/xtimer.c: ensure modifing mutex is done with interrupt disabled
  * xtimer/xtimer.c: _mutex_timeout improvements
  * xtimer/xtimer.c: sched_switch instead of yield

-- File Changes --

    M sys/include/xtimer.h (2)
    M sys/xtimer/xtimer.c (17)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/11807.patch
https://github.com/RIOT-OS/RIOT/pull/11807.diff

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