Hi there,
another not quite simple question I have regarding gpgme is:
How exactly does
it work? Am I seeing this correctly that it uses fork() to
start an external
process and communicates with it through pipes?
And if so, what happens to mutexes in that case. I often
heard forking
processes with mutexes is always messy and results in
strange behaviour.
(Stevens, "Unix IPC")
To give you an example:
I've got a multithreaded process here which uses gpgme to
check signatures.
After this has run for a certain time I notice that the
processe's internal
locking (pthread mutexes) doesn't seem to work anymore.
Several mutexes of my
own apparently are not unlocked anymore.
And even more strange:
Usually when I look at the process in question I see
something like this:
root 9128 0.0 0.1 33860 4584 ? SNs 13:58 0:00
/usr/sbin/mypro
nobody 9129 40.4 2.3 140648 95904 ? SNs 13:58 29:29 _
/usr/sbin/mypro
The demonized process and the working process with different
rights.
Right now I see this:
root 9128 0.0 0.1 33860 4584 ? SNs 13:58 0:00
/usr/sbin/mypro
nobody 9129 40.4 2.3 140648 95904 ? SNs 13:58 29:29 _
/usr/sbin/mypro
nobody 4882 0.0 1.4 113408 61368 ? SN 14:03 0:00
/usr/sbin/mypro
nobody 2905 0.0 2.0 138020 84748 ? SN 14:08 0:00
/usr/sbin/mypro
nobody 10988 0.0 2.1 142816 90308 ? SN 14:56 0:00
/usr/sbin/mypro
The original two I expect to see plus several (I noticed up
to three)
additional ones. I suppose those come from gpgme which is
the only thing that
has changed. When I look at the internal thread management
of this process I
see three threads hanging for about the time when those
three threads have
been created. So I assume they are doing signature checking
and are hanging
somewhere.
When I attach gdb to any of those processes I see something
like this:
0xffffe410 in __kernel_vsyscall ()
(gdb) bt
#0 0xffffe410 in __kernel_vsyscall ()
#1 0xb7b0881b in __lll_mutex_lock_wait ()
from /lib/tls/i686/cmov/libpthread.so.0
#2 0xb7b059f3 in _L_mutex_lock_26 () from
/lib/tls/i686/cmov/libpthread.so.0
#3 0xb6496530 in ?? ()
#4 0x00000000 in ?? ()
What I'm afraid of now is, that gpgme might fork() in order
to do it's magic
and mess up it's own mutexes (or mine) doing so.
Does all that say anything to you guys or am I completely
mistaken here?
Greetings and thanks for your help...
Stephan
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