[riot-notifications] [RIOT-OS/RIOT] Pr/xtimer mutex lock timeout/first tests (#11679)

Julian Holzwarth notifications at github.com
Wed Jun 12 14:03:26 CEST 2019

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### Contribution description
This pr implements normal test case tests for `xtimer_mutex_lock_timeout` in `xtimer.c `. As the timeout `XTIMER_BACKOFF * 3` is used to make sure it does not spin. And adds a short comment for the struct it uses (`mutex_thread_t`). Also because the integer `timeout` in the struct is modified from interupt context it must be volatile. 
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### Testing procedure
`BOARD=native make -C tests/xtimer_mutex_lock timeout/ flash test`

> mutex_timeout_n_spin_unlocked
starting test: xtimer mutex lock timeout
> mutex_timeout_n_spin_locked
starting test: xtimer mutex lock timeout

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### Issues/PRs references

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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 the tracking pr: #11660

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-- Commit Summary --

  * xtimer/xtimer.c document mutex_thread_t
  * xtimer/xtimer.c: fix timeout is volatile
  * tests/xtimer_mutex_lock_timeout: minimal xtimer_mutex_lock_timeout test
  * tests/xtimer_mutex_lock_timeout: new test cmd_test_xtimer_mutex_lock_timeout_greater_backoff_locked

-- File Changes --

    M sys/xtimer/xtimer.c (6)
    A tests/xtimer_mutex_lock_timeout/Makefile (7)
    A tests/xtimer_mutex_lock_timeout/main.c (117)
    A tests/xtimer_mutex_lock_timeout/tests/01-run.py (32)

-- Patch Links --


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