Problems with pipe(...); using select(...);

Applications Programming
1

Hello all,

My problem is as follows:

I'm trying to wake up a select(...); using a pipe fd. This should be rather straightforward, but I cannot get it to work. Perhaps you guys could give me a few tips.

My wakeup function looks like this:

STATIC void net_trig_wr()
{
   /* write a dummy to wake up net thread */
   write(net_pipefd, _T("TRIG"), 4);
}

This pipe is created using:

   int pipe_set[2];
   ALLEGE(pipe(pipe_set) == 0);
   net_pipefd = pipe_set[1];
   FD_SET(pipe_set[0], &net_rd_set);

And the net_rd_set is the set select uses:

 ALLEGE((res = select(maxfd+1, &net_rd_set, &net_wr_set, NULL, NULL)) != -1);

Of course the maxfd is set to:

 maxfd = pipe_set[0];

It should be noted net_trig_wr(); is called from another thread (created using POSIX-threads) than the select(...) operates in.

I've attached the entire net.c file (as net.txt) in this document. So if you want to have a look at it to help me further. Feel free to get inspired by my code also (if there is anything to get inspired by).

Any tips would be usefull!

/ Henrik, Sweden

(For the intressted, im actually rewriting a Java-server I've done for www.betapet.com which is a free swedish scrabble-site)