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List:       linux-ia64
Subject:    [Linux-ia64] pthread_mutex_lock sometimes fails on Linux 2.4.5
From:       "Robboy, David G" <david.g.robboy () intel ! com>
Date:       2001-06-27 18:06:12
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On a 4P Lion with Red Hat 7.0.98 installed and a 2.4.5 kernel, a 4P fft
application sometimes hangs in a barrier.  All 4 threads get into the
barrier and none get out because a count gets up to 3 and they are waiting
for it to get to 4.  I changed my barrier code to use an assembly language
lock instead of pthread_mutex_lock(), and it works reliably now.  Either
there is a bug in pthread_mutex_lock, or else a memory management bug in the
kernel.  I've worked around this and it is not causing me a problem now.  If
anyone wants to investigate and debug this, I'll be glad to supply a test
case.

David Robboy



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