Re: linuxthreads/malloc problem

[Wolfram Gloger]

> I have problems with malloc/free when I use it in my pthread programs. I
> keep getting segfaults when I start 2 instances of the program.

Huh?  That would indicate either a kernel or a hardware problem.

> The program starts a bunch of threads. The threads malloc a buffer and
> signal another thread which frees the buffer. After the buffer is freed,
> the whole circle starts again.

Two points that you're probably already aware of, but just in case:

- You must never call malloc() or free() in a signal handler.
  _Never_!

- You can't pass buffer addresses between separate processes and
  then free them in a process other than the one that allocated them.
  (Note `process(es)', not `thread(s)'!)

> I wrote a little test program that demonstrates the problems on my
> machine. When I remove the malloc/free's, everything runs fine. I can
> send it to you when you think it helps.

Yes, if you're aware of the above restrictions, please send it
(possibly in private if it is large).

Regards,
Wolfram.