Automated test "mutex_posix" fails sporadically

[luebbers]

The "exec_mute_posix" test of the automated test suite ($RECONOS/tests/automated) fails with the following output:

 mutex lock and release by hwthread: too early

A possible cause may be an insufficient priority of the delegate thread causing it not to wake up reliably during the waiting period of the test routine.

Possible fixes:

• Generally increase delegate thread priority (e.g. "cyg_thread_set_priority(self_handle, 1)" within the delegate thread's code (reconos_delegate_thread() in delegate.tmpl). Works, but is not recommended, since it does not allow application control over the priorities of delegates, which may need to be different.
• Fix the test routine to use cyg_thread_delay() instead of a polling delay loop. Works, but kinda hides the problem.
• Other fixes?

See also mailing-list thread starting with this post:
http://www.mail-archive.com/reconos-devel@lists.reconos.de/msg00008.html