Hi Erik,
thanks for responding!
On 03/22/11 08:47, Erik Hofman wrote:
> On Mon, 2011-03-21 at 15:04 +0100, Holger Wirtz wrote:
>> Hi all,
>>
>> sorry - a little bit off-topic (in fact not so much as you might think,
>> it's for a third-party software for FG):
>>
>> Has anyone some hints/websites/programs for debugging C -based multi
>> threaded programs (exactly: glib based C code)? Currently I am
>> developing with vi and a little bit gdb (command line) and very much
>> debug output. But this setup seems to be very frustrating while
>> searching for dead-locks and race-conditions :-(
>
> I have my own locking functions that call the pthread ones and added a
> small piece of code to check for the mutex value:
>
>
> pthread_mutex_t mutex;
> int mtx = mutex.__data.__count;
>
> r = pthread_mutex_lock(&mutex);
> if (mtx != 1) {
> printf("Mutex was already locked\n");
> }
I tried the same thing with the glib-pthreads wrappers, but
pthread_mutex_lock blocks until the mutex is unlocked. Perhaps this
should work with pthread_mutex_trylock()?
> You could add all kinds of fancy stuff using __FILE__, __FUNCTION__ and
> __LINE__ to detect from where the code has been called.
> Note: This only works for __GNUC__
Ok, this seems to be a good way to get more information where the dead
locks are located. I will try this.
Thanks a lot!
Holger
>
> Erik
>
>
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