[gpsd-commit-watch] [SCM] GPSD branch, master, updated. release-3.16-502-g39463e4

[Gary E. Miller]

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- Log -----------------------------------------------------------------
commit 39463e42b0f65ae3dd505459a1333b1963b33cd2
Author: Fred Wright <address@hidden>
Date:   Wed Sep 28 16:45:47 2016 -0700

    Fixes various flakiness in PPS handling.
    
    The pps_thread_activate() code uses a single structure to pass
    information to the monitor thread.  The latter copies the data during
    its initialization, so there's no long-term conflict across threads,
    but there's no guarantee that the thread runs and gets far enough to
    do that before the structure is reused.  Note that this bug is fairly
    unlikely to affect a multicore machine unless it's heavily loaded, but
    easily causes trouble on a single-core machine.
    
    A variety of strange PPS misbehaviors were observed on a Beaglebone
    Black in the presence of this bug, including various nonreproducible
    PPS initialization problems and failures, and duplicate PPS reports.
    
    This change uses the pps_thread field as a flag to communicate a "copy
    acknowledgment" back to pps_thread_activate(), which waits for it
    before proceeding.
    
    TESTED:
    Launched several times on a Beaglebone Black with KPPS support, and
    no longer observed flaky PPS startup in the logs, as well as no
    longer observing duplicate PPS events in gpsmon.  Not tested on
    other platforms due to the lack of PPS availability.
    
    Signed-off-by: Gary E. Miller <address@hidden>

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

Summary of changes:
 ppsthread.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)


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