[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.6-103-gfc67feb

[mark@sourceware.org]

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- Log -----------------------------------------------------------------
commit fc67febc6733e5803e6883a3757abda6268a953a
Author: Mark Wielaard <mjw@redhat.com>
Date:   Tue Aug 16 14:31:29 2011 +0200

    Reintroduce timer for transport cmd channel, don't wake_up unconditionally.
    
    Revert parts of commit a85c8a "runtime/io.c: Explicitly signal setting of
    _stp_exit_flag" and commit 46ac9e "Remove _stp_ctl_work_timer from module
    transport layer". Introduce a new test wake_up.exp that shows a deadlock
    when sending cmd messages and waking up the reader immediately.
    
    Renamed _stp_ctl_write to _stp_ctl_send, which can be called from
    everywhere. Rename _stp_ctl_send to _stp_ctl_send_notify that can be
    called from user context in the transport layer itself (this will
    immediately notify any readers). Document all places that use
    _stp_ctl_send_notify directly to clarify why that is safe.
    
    See http://sourceware.org/ml/systemtap/2011-q3/msg00163.html

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

Summary of changes:
 runtime/io.c                        |    4 +-
 runtime/print_flush.c               |    8 ++-
 runtime/transport/control.c         |   93 ++++++++++++++++-------------------
 runtime/transport/control.h         |    3 +-
 runtime/transport/transport.c       |   69 +++++++++++++++++++++++--
 runtime/transport/transport.h       |    2 -
 testsuite/systemtap.base/wakeup.exp |   24 +++++++++
 testsuite/systemtap.base/wakeup.stp |   13 +++++
 8 files changed, 153 insertions(+), 63 deletions(-)
 create mode 100644 testsuite/systemtap.base/wakeup.exp
 create mode 100644 testsuite/systemtap.base/wakeup.stp


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