multithreading - 多线程 perl 脚本中的 Control+C 处理

Question

我是 perl 新手，在我的 perl 脚本中处理 ^C 时遇到问题。当我在 sleep 期间收到 ^C 后尝试继续执行脚本时，我只在 $FLAG = 2; 之前输出；之后什么都没有:

# perl test.pl 
sleeping...
^Cawaiking...  =  
#  

代替:

# perl test.pl 
sleeping...
awaiking...    ====                                              
some..
#

它似乎 ^C 正在终止进度条线程，并且在它终止后没有任何操作，但可以在主线程中执行打印。谁能帮我解决这个问题？

$SIG{INT} = 'IGNORE';
our $FLAG : shared = 1; 
...
sub call1{
    $FLAG = 1;
    my $pBar = threads->new(\&progressBarInit);
    $pBar->detach;
    print "sleeping...\n";
    sleep 5;
    print "awaiking...\n";
    $FLAG = 2;
    print "some..\n";
    return @result;
}

call1();

sub progressBarInit{
my $max = 50;
    my $counter = 1;
    while($FLAG == 1){
        progressBar( $counter, $max, 50, '=' );
        $counter++;
        if($counter > $max){$counter=1;}
        sleep 1;
    }
}

sub progressBar {
    my ( $counter, $max, $width, $char ) = @_;
    local $| = 1;
    printf "               %-${width}s\r", $char x (($width-1)*$counter/$max);
}

Answer 1

我认为问题在于您在父级中设置了信号处理程序。

根据这个:http://perldoc.perl.org/threads.html

Signal handlers need to be set up in the threads for the signals they are expected to act upon. Here's an example for cancelling a thread:

除了使用标志，您还可以使用信号进行通信:

sub progressBarInit    {
  # Thread 'cancellation' signal handler
  $SIG{'KILL'} = sub { threads->exit(); };
  $SIG{INT} = 'IGNORE';
  ...
}
...
# Signal the thread to terminate, and then detach
# it so that it will get cleaned up automatically
   my $pBar = threads->new(\&progressBarInit);    
    print "sleeping...\n";
    sleep 5;
    print "awaiking...\n";
    $pBar->kill('KILL')->detach();