RE: [cgl_discussion] [PATCH] Robust and Real-time Mutexes in NPTL

Here is the update of robust and real-time mutexes in nptl and the kernel
side is till under heavily  redesign. 


Changes
=======
* Robust and real-time features have been split.
* rtflags has been removed and its info has been folded into 4 bits of
   mutexkind. 

*rtnptl-robust-0.5.1.diff        Robust mutex patches against nptl-0.36.
*rnptl-rt-0.5.1.diff                  RT feature against rtnptl-robust-0.5.1.diff

Takashi Oe's issue has been addressed in rtnptl-robust-0.5.1.diff. 

The latest update could be reached at:
        http://developer.osdl.org/dev/robustmutexes/


boris

Not speaking for my employer -- all opinions are my own (and my fault)

nptl/arm: http://xcgl-port.sourceforge.net/nptl.html


> -----Original Message-----
> From: Liu, Bing Wei 
> Sent: 2003年6月27日 10:09
> To: [email protected]; [email protected]
> Subject: [cgl_discussion] [PATCH] Robust and Real-time Mutexes in NPTL
> 
> 
> Hi All,
> 
> This is a ---prototype implementation--- that extends NPTL with
> real-time and robust mutex features.  The intention is to have an
> approach to locking that will benefit the applications that care
> about responsiveness and robustness of the locks without affecting
> other types of applications. Currently this is work in progress, and
> the implementation is subject to much flux, both in the user or
> kernel code.
> 
> 
> Features
> =======
> - robust mutex
>     Applications using a robust mutex can detect whether the previous
> owner of the mutex terminated and then pass on the ownership to the
> next waiter. The new owner can then attempt to cleanup the state
> protected by the mutex, and re-initialize it for continued use.  If
> cleanup of the state can't be done, the mutex can be marked
> inconsistent so that any future attempts to lock it will get a status
> indicating that it is inconsistent.
> 
> - priority inheritance mutex
>     Applications using a priority inheritance mutex can temporarily
> boost the priority of the current owner of the mutex, if a
> higher-priority thread is blocked trying to lock the same mutex. This
> will help to addresses the priority inversion issue and improve
> real-time responsiveness.
> 
> 
> Links
> ====
> All related patches, documents, and test cases have been posted at
> http://developer.osdl.org/dev/robustmutexes/, including:
> 
> - rtnptl-0.5.patch :  robust and real-time mutexes patch for 
> nptl-0.36.
> - README-rtnptl-0.5 :  release notes of rtnptl-0.5.
> - INSTALL-rtnptl-0.5 :  a sample step-by-step procedure for building
> a simple jail root of rtnptl-0.5 based on nptl-0.36
> - rtnptl-test-0.5.tar.gz :  test cases for rtnptl-0.5
> - README-rtnptl-tests-0.5 :  release notes of rtnptl-test-0.5
> - rtfutex-2_5_67-6.patch:  real-time futex (rtfutex) patch for
> kernel-2.5.67
> - rtfutex-test-6.tar.gz :  test cases for rtfutex-6
> - README-rtfutex-6 :  release notes of rtfutex-6
> - a few png files to illustrate priority inheritance behavior.
> 
> 
> A quick glance at rtnptl-0.5.patch 
> ========================
>  Makefile                                          |    9
>  Versions                                          |    5
>  init.c                                            |    6
>  pthread_mutex_consistent_np.c                     |   16 +
>  pthread_mutex_init.c                              |    8
>  pthread_mutex_lock.c                              |   26 ++
>  pthread_mutex_setconsistency_np.c                 |   22 ++
>  pthread_mutex_timedlock.c                         |   33 ++-
>  pthread_mutex_trylock.c                           |   37 ++-
>  pthread_mutex_unlock.c                            |   30 ++-
>  pthread_mutexattr_getprotocol.c                   |   29 +++
>  pthread_mutexattr_getrobust_np.c                  |   28 ++
>  pthread_mutexattr_init.c                          |    5
>  pthread_mutexattr_setprotocol.c                   |   54 +++++
>  pthread_mutexattr_setrobust_np.c                  |   36 +++
>  sysdeps/pthread/createthread.c                    |   12 +
>  sysdeps/pthread/pthread.h                         |   56 +++++
>  sysdeps/unix/sysv/linux/fork.c                    |    7
>  sysdeps/unix/sysv/linux/i386/bits/pthreadtypes.h  |    8
>  sysdeps/unix/sysv/linux/i386/i486/lowlevelmutex.S |  210 ++++++++++
>  sysdeps/unix/sysv/linux/i386/lowlevellock.h       |  160 ++++++++++
>  sysdeps/unix/sysv/linux/internaltypes.h           |   12 +
>  22 files changed, 775 insertions(+), 34 deletions(-)
> 
> 
> Thank,
> Bingwei Liu
> 
> Not speaking for my employer -- all opinions are my own (and my fault)
> 
> 
>  <<README-rtnptl-0.5>>  <<rtnptl-0.5.patch>> 
>