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[Doytch]

So I'm writing a basic web server for class, and I'm trying to get the multithreading to work. Each thread would run a function in my HTTPserver class, which services one connection. I want to start off by running 5 threads, and then whenever someone connects, start a new thread, until I hit a max_threads ceiling.

Now, our prof gave us some code that's supposed to make it simpler to pass the correct function into pthread_create. When my problems started acting up, I gave up and tried to go to a lower and lower level, until I get to this:

int main() {
    mutex = new Mutex();
    int i=0;
    pthread_t thread[6];
    pthread_attr_t DetachedAttr;
    pthread_attr_init(&DetachedAttr);
    pthread_attr_setdetachstate(&DetachedAttr,PTHREAD_CREATE_DETACHED);  
  
    while(1){
      if(i<6){
        int res = pthread_create(&(thread[i]), &DetachedAttr, trix, NULL); 
	i++;
      }
    }
    return 0;
}

The problem here is that trix is never executed. pthread_create returns a 0, so no errors there.

Trix just increments a global sum inside a mutex. It's defined as void *trix(void *), and is located in the same file.

The detached bits I threw in after it didn't run trix when I passed in NULL as an attribute.

The only way I can get trix to execute is if I call a join() somewhere(when it's not detached of course). Obviously I'm new to writing threaded programs, so is this working as intended? Do the functions not execute until the main program reaches a join() or something? Google didn't seem to verify that.

Help is very much appreciated!

 

[Doytch]

OK, this is a problem with the shittacular Solaris labs we have to use for this. I've always tested it remotely, but when I compile/run it at home on my Linux box, it works.

Now if I could find a way around this...