Re: [ts-7000] Re: TS7300, Serials and pthread

["Alvaro Aguirre" <>]

The use of mutex (pthread_mutex_init, pthread_mutex_lock, pthread_mutex_unlock) is very important when you need to touch shared memory zones with the threads. Also remember to join the thread when it finishes or the memory will not be freed, if you can't join them create the threads on detach mode. with out Valgrind on the ARM architecture is damn ugly debug threads, but you can make use of the errno system messages and log the to the stderr or syslog. I told you this because I spend two weeks searching a thread bug and I can't find it until I put log messages on all the program.

Good Luck,
Alvaro

On 2/24/07, Larry <> wrote:

I've had similar experiences with pthreads. I will avoid them because of it.
What you may be seeing is not the wrong port, but the wrong data making it
appear you have the wrong port. Avoid using global variables with pthreads.
Larry

pa_ie2000 wrote:

Hi Charlie,
tried the -D_REENTRANT...no luck.

Whenever the other thread starts, data destined for COM4 goes out
over COM3 and I can't read from either port.

I'm assuming that somewhere in the code I've got some non thread
safe calls but am probably staring at the code too long to see them.

The glibc is a standard build that comes with the TS-7300...I'm
using the pthread library in it....LinuxThreads.

Paul.

>
> Hi Paul --
>
> Try adding "-D_REENTRANT" to your gcc command line (one underscore,
> BTW). That way it's defined already when system header files are
> included; right now you define it in your source after everything
else
> is included. Maybe throw on a "-D_GNU_SOURCE" too.
>
> Does the read from COM4 block, or is the data you read corrupted?
>
> Which threading library is your system using, linuxthreads or NPTL?
>
> regards, ......... Charlie
>

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