Thanks a lot for the help. I tested around a little bit and found, that
just using "require Socket;import Socket ':all';" instead of "use
Socket;" solves the problem.
That means, the below code will work OK and will not block:
#!/usr/bin/perl
use threads;
#use Socket; <- this would block !!
require Socket;
import Socket ':all';
unlink ("/tmp/mysock");
my $t=threads->create("con_thread");
socket (SOCK1,PF_UNIX,SOCK_STREAM,0) or die "socket(): $!";
bind (SOCK1, sockaddr_un("/tmp/mysock")) or die "bind(): $!";
listen(SOCK1,SOMAXCONN) or die "listen(): $!";
accept (CLIENT,SOCK1);
$t->join();
sub con_thread {
sleep(2);
socket(SOCK2, PF_UNIX, SOCK_STREAM, 0) or die "socket(): $!";
connect(SOCK2, sockaddr_un("/tmp/mysock")) or die "connect(): $!";
}
This is very strange as I always thought "use" and "require, import" are
equivalents ...
Jerry D. Hedden wrote:
Sebastian Weber wrote:
The following code sets up a UNIX domain socket server
and connects to that server in a different thread. I found the
following
code using threads to block forever - ist blocks exactly at the
connect
/ accept calls:
#!/usr/bin/perl
use threads;
use Socket;
unlink ("/tmp/mysock");
$t=threads->create("con_thread");
socket (SOCK1,PF_UNIX,SOCK_STREAM,0) or die "socket(): $!";
bind (SOCK1, sockaddr_un("/tmp/mysock")) or die "bind(): $!";
listen(SOCK1,SOMAXCONN) or die "listen(): $!";
accept (CLIENT,SOCK1);
$t->join();
sub con_thread {
sleep(2);
socket(SOCK2, PF_UNIX, SOCK_STREAM, 0) or die "socket(): $!";
connect(SOCK2, sockaddr_un("/tmp/mysock")) or die "connect():
$!";
}
Whereas the same code will not block using fork():
#!/usr/bin/perl
use threads;
use Socket;
unlink ("/tmp/mysock");
if (fork) {con_thread();exit;}
socket (SOCK1,PF_UNIX,SOCK_STREAM,0) or die "socket(): $!";
bind (SOCK1, sockaddr_un("/tmp/mysock")) or die "bind(): $!";
listen(SOCK1,SOMAXCONN) or die "listen(): $!";
accept (CLIENT,SOCK1);
sub con_thread {
sleep(2);
socket(SOCK2, PF_UNIX, SOCK_STREAM, 0) or die "socket(): $!";
connect(SOCK2, sockaddr_un("/tmp/mysock")) or die "connect():
$!";
}
Does anybody have any idea why?? Is there a workaround?
BTW: Im using Perl v5.8.7 built for cygwin-thread-multi-64int
The problem is that Socket is not thread-safe. You can work around
this by loading Socket into the main thread after creating the child
thread, and loading it separately in the child thread:
#!/usr/bin/perl
use threads;
unlink ("/tmp/mysock");
my $t=threads->create("con_thread");
require Socket;
import Socket ':all';
socket (SOCK1,PF_UNIX,SOCK_STREAM,0) or die "socket(): $!";
bind (SOCK1, sockaddr_un("/tmp/mysock")) or die "bind(): $!";
listen(SOCK1,SOMAXCONN) or die "listen(): $!";
accept (CLIENT,SOCK1);
$t->join();
sub con_thread {
require Socket;
import Socket ':all';
sleep(2);
socket(SOCK2, PF_UNIX, SOCK_STREAM, 0) or die "socket(): $!";
connect(SOCK2, sockaddr_un("/tmp/mysock")) or die "connect(): $!";
}
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