I just committed code to cvs (HEAD branch) that makes use of the MIT-SHM
extension to use shared memory to render pixmaps. This speeds up
rendering, and is a good thing in general.
However, one issue remains. If blackbox (or anything using libbt) crashes
and doesn't cleanup correctly, the shared memory isn't properly cleaned up
and the memory will still be allocated (but never used).
If you do have a crash of blackbox from cvs (HEAD branch), then you will
need to tell the OS to destroy the unused shared memory. I don't know how
this is done on all operating systems, but for FreeBSD run 'ipcs -bm' and
look for a chunk of shared memory with the SEGSZ '480000'. You'll then
need to run 'ipcrm -m ID' where ID is from the ID column in the ipcs
output. For example:
[bhughes@reticent] ~% ipcs -bm
Shared Memory:
T ID KEY MODE OWNER GROUP SEGSZ
m 327681 0 --rw-r--r-- root wheel 106496
m 32964613 0 --rw-r--r-- bhughes bhughes 480000
m 54788102 0 --rw-r--r-- root wheel 110592
m 1179655 0 --rw-r--r-- root wheel 110592
m 1310728 0 --rw-r--r-- root wheel 110592
m 4784137 0 --rw-r--r-- root wheel 110592
m 131082 0 --rw-r--r-- root wheel 110592
[bhughes@reticent] ~% ipcrm -m 32964613
[bhughes@reticent] ~%
Consult docs for your OS to see how to do this.
I am working on a solution for correctly destroying the shared memory in a
crash situation, and hope to have that soon, so you won't have to do this
for too long, only if you use blackbox from cvs from today.
Thanks :)
--
Bradley T. Hughes - bhughes at trolltech.com
Trolltech AS - Waldemar Thranes gt. 98 N-0175 Oslo, Norway
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