[Bugs] [Bug 1370921] New: Improve robustness by checking result of pthread_mutex_lock()

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1370921

            Bug ID: 1370921
           Summary: Improve robustness by checking result of
                    pthread_mutex_lock()
           Product: GlusterFS
           Version: mainline
         Component: core
          Keywords: Triaged
          Severity: medium
          Assignee: bugs at gluster.org
          Reporter: ndevos at redhat.com
                CC: bugs at gluster.org



Description of problem:
pthread_mutex_lock() can return without successfully locking the mutex. Many
calls to this function assume that is always blocks until the locking succeeds.

Version-Release number of selected component (if applicable):
all

How reproducible:
code review

Actual results:
Many data structures use a pthread_mutex for exclusive access and guaranteeing
atomic updates. Unfortunately a lot of occurrences do not check the
success/fail result of the call to pthread_mutex_lock().

Expected results:
In case pthread_mutex_lock() fails, a retry or abort of the function should be
done, depending on the result errno contains.

Additional info:
See 'man 3p pthreead_mutex_lock'.

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