I'm trying to learn about pthreads for a class I'm taking. I found a nice little threaded program online, at hpcf.nersc.gov/vendor_docs/ibm/aixprggd/genprogc/create_threads.htm and tried it out:

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//thread.cpp
#include <pthread.h>
#include <iostream>
#include <fstream>
#include <unistd.h>

void *Thread(void *string)
{
while(1)
printf("%s\n", (char *)string);
pthread_exit(NULL);
}

int main()
{
char *e_str = "Hello";
char *f_str = "Bonjour";

pthread_t e_th;
pthread_t f_th;

int rc;

rc = pthread_create(&e_th, NULL, Thread, (void *)e_str);
if(rc)
exit(-1);
rc = pthread_create(&f_th, NULL, Thread, (void *)f_str);
if(rc)
exit(-1);
sleep(5);

exit(0);
}
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My Makefile:
----------------------------------------------------------------------------------
LDFLAGS=-lstdc++

all: main

clean:
-rm -f main thread.o

main: thread.o
thread.o: thread.cpp
--------------------------------------------------------------------------------

I run Make, and it works fine. But when I try to run the program all it give me is:
"Segmentation Fault"

I'm running this thing on a Knoppix 3.3 install, if it helps any.

Assistance appreciated. I'm a pretty Linux programmer, and barely know what I'm doing. A friend wrote the Makefile for another program, and I adapted it for this one.

I saw some very old stuff online that said some libraries don't seem to like pthreads, but nothing in recent years.

i dont know bout knoppix ...
but you seem to be mixing c++ and c up (not that you can't, but in this instance there is nothing in the code that requires any of the C++ libs)
just copy whatever code is on that webpage u referred to, save as thread.c and run a 'gcc thread.c -Wall -lpthread'. (i think you need to link it with the pthread lib - that might be one of the reasons for the segfault?)

also, maybe you could run an trace on the executable, and see where in the exec it throws the segfault?

Modify the code to link with -lpthread, that should make it run.
Mixing C and C++ code is OK.

One thing here: using printf in threads is not recommended when you don't use mutexes/semaphores to make sure only one thread's is sending to screen.

Thanks for the help. Added this line to Makefile:

LDFLAGS += -lpthread

Also, removed the line about main: Wasn't needed for this program.