[Bug nptl/5192] Internal lock in pthread struct is vulnerable to priority inversion

[spcurry5 at linux dot vnet dot ibm dot com]

------- Additional Comments From spcurry5 at linux dot vnet dot ibm dot com  2008-04-25 01:26 -------
I have a few points worth noting:

(1) I was unable to find anywhere in the POSIX specification that states the
per-thread mutex must not cause a priority inversion.
(2) Changing the pthread implementation so that every thread has a
priority-inheritance mutex, instead of a standard mutex, would cause some
performance loss due to the extra overhead associated with using
priority-inheritance mutexes. 
(3) The priority inversion situation you have described does not cause any of
the threads to hold onto a resource indefinitely, thereby preventing some other
thread from ever making forward progress. All threads eventually make forward
progress, therefore, this is more of a performance issue than a correctness
issue. So I am marking this bug as an enhancement.

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           What    |Removed                     |Added
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           Severity|normal                      |enhancement


http://sourceware.org/bugzilla/show_bug.cgi?id=5192

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