[SCM] Hurd branch, master, updated. v0.5-499-g7ca4c02

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 7ca4c02513d7c6998d9c92dafb3c0fcbe8d6dd6d
Author: Samuel Thibault <address@hidden>
Date:   Thu Nov 27 19:05:57 2014 +0100

    Add atomicity support to fshelp_acquire_lock
    
    This adds support for the __LOCK_ATOMIC flag which requests atomicity of 
SH->EX
    upgrades and EX->SH downgrades.
    
    * libfshelp/lock-acquire.c (__LOCK_ATOMIC): New macro
    (fshelp_acquire_lock): When __LOCK_ATOMIC is set, do not release the
    lock early, change the lock hold atomically instead. On upgrade to LOCK_EX,
    prevent new shared locks from being acquired to avoid starvation.

commit b69b9c28b6628c7d736476d075d56ae137afd343
Author: Samuel Thibault <address@hidden>
Date:   Thu Nov 27 01:24:43 2014 +0100

    Fix proc crashes
    
    * proc/notify.c (do_mach_notify_dead_name): When `pi' is NULL,
    immediately return EOPNOTSUPP.

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

Summary of changes:
 libfshelp/lock-acquire.c |   95 +++++++++++++++++++++++++++++++++++++---------
 proc/notify.c            |    6 ++-
 2 files changed, 81 insertions(+), 20 deletions(-)


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