[SCM] GNU Mach branch, master, updated. v1.5-78-ge6c6e15

[Justus Winter]

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       via  347cb29151859a56a6c5f0f355a43033e5e035a5 (commit)
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- Log -----------------------------------------------------------------
commit e6c6e15b03639e98df68df35ba0f639bdbc1dc51
Author: Justus Winter <address@hidden>
Date:   Sat Aug 15 18:30:28 2015 +0200

    kern: keep track of the writer when debugging locks
    
    * configfrag.ac (MACH_LDEBUG): Adjust comment, we use it to sanity
    check all locks now.
    * kern/lock.c (lock_write): Keep track of the writer thread.
    (lock_done): Clear writer.
    (lock_read_to_write): Keep track of the writer thread.
    (lock_write_to_read): Assert that the current thread holds the lock.
    Clear writer.
    (lock_try_write): Keep track of the writer thread.
    (lock_try_read_to_write): Likewise.
    (lock_set_recursive): Assert that the current thread holds the lock.
    * kern/lock.h (struct lock): New field `writer'.
    (have_read_lock, have_write_lock, have_lock): New macros that can be
    used to assert that the current thread holds the given lock.  If
    MACH_LDEBUG is not set, they evaluate to true.

commit 347cb29151859a56a6c5f0f355a43033e5e035a5
Author: Justus Winter <address@hidden>
Date:   Sat Aug 15 17:04:08 2015 +0200

    kern: improve simple lock debugging
    
    Do not bother saving the return address when acquire a simple lock.
    Save the location as provided by the compiler as string instead.  Also
    save the lock parameter.
    
    * kern/lock.c (struct simple_locks_info): Drop `ra', add `expr', `loc'.
    (simple_lock): Rename to `_simple_lock', add expression and location
    parameters and save them.
    (simple_lock_try): Likewise.
    (simple_unlock): Zero-out the now unused slot in the list of taken locks.
    (db_show_all_slocks): Use the new information.
    * kern/lock.h (simple_lock, simple_lock_try): Provide macro versions
    passing the location and expression as string.

commit bdc9b8583e6336bb3a44a80f10bac8b7b369719c
Author: Justus Winter <address@hidden>
Date:   Sat Aug 15 16:43:24 2015 +0200

    kern: disable the simple lock checks while debugging
    
    * kern/lock.c (do_check_simple_locks): New variable.
    (check_simple_locks): Make check conditional.
    (check_simple_locks_{en,dis}able): New functions.
    * kern/lock.h (check_simple_locks_{en,dis}able): New declarations.
    * ddb/db_trap.c (db_task_trap): Disable simple lock checks.

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

Summary of changes:
 configfrag.ac |    2 +-
 ddb/db_trap.c |    4 +++
 kern/lock.c   |   74 +++++++++++++++++++++++++++++++++++++++++++-------------
 kern/lock.h   |   35 +++++++++++++++++++++++++-
 4 files changed, 95 insertions(+), 20 deletions(-)


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