[PD-dev] How to pass indeterminate args to a thread

B. Bogart ben at ekran.org
Fri Feb 27 22:01:29 CET 2009

Thanks Claude!

I got lots of help from Matju on IRC so things are compiling.

I'm now getting a segfault when trying to access a member of the
structure in the thread function:

#0  0xf7d531cb in strlen () from /lib/i686/cmov/libc.so.6
#1  0xf7d1f648 in vfprintf () from /lib/i686/cmov/libc.so.6
#2  0xf7d43e04 in vsnprintf () from /lib/i686/cmov/libc.so.6
#3  0x080c68d6 in post (fmt=0xf7f7db5a "My symbol: %s")
    at s_print.c:51
#4  0xf7f7d829 in mythread ()
   from /home/bbogart/src/gphoto/src/pd-external/gphoto2.pd_linux

The way I'm trying to access the member is as follows:

post("My symbol: %s", ((struct floatArgStruct *)threadArgs)->s->s_name);

I've attached the full source.

All this typdef stuff is new to me, so I may have messed up something


Claude Heiland-Allen wrote:

>>     post("My symbol: %s", threadArgs.s->s_name);    // line 92
> threadArgs is a pointer, '.' is only for structs/unions
> try '->' instead of '.' to both dereference pointer and access member
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