[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.1-194-g0da46fc

[jistone at sourceware dot org]

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- Log -----------------------------------------------------------------
commit 0da46fcdec144f944838350f08f59a36b8709e90
Author: Josh Stone <jistone@redhat.com>
Date:   Thu Mar 11 17:14:59 2010 -0800

    Fix the edge-case of MAXTRYLOCK=0
    
    We didn't really have good semantics for what is meant by MAXTRYLOCK=0,
    so when skipped.exp tried it, we ended up locking the variable and then
    reporting a skip without ever unlocking it.
    
    This is now cleaning up the semantics such that MAXTRYLOCK defines how
    many times we should loop if the lock is busy.  Thus MAXTRYLOCK=0 means
    we try only once and fail immediately.
    
    The testcase was accidentally creating contention due to the broken
    unlock behavior.  We now have to try a bit harder to create real
    contention, so some lengthy delays are inserted to hoard the lock.
    
    * runtime/probe_lock.h (stp_probe_lock): Fix the skip behavior.
    * testsuite/systemtap.base/skipped.exp: Add a big udelay.

-----------------------------------------------------------------------

Summary of changes:
 runtime/probe_lock.h                 |   30 +++++++++++++++++-------------
 testsuite/systemtap.base/skipped.exp |    8 +++++++-
 2 files changed, 24 insertions(+), 14 deletions(-)


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