[英]Run perl subroutine in the background
有没有办法在后台运行perl子程序? 我环顾四周,看到一些关于线程的提及,但它会有助于看到一个例子,或指向我正确的方向。 谢谢。
想在后台运行run_sleep
。
#!/usr/bin/perl
print "Start of script";
run_sleep();
print "End of script";
sub run_sleep {
select(undef, undef, undef, 5); #Sleep for 5 seconds then do whatever
}
最简单的方法(恕我直言)是fork
一个子进程让它做的工作。 Perl线程可能会很痛苦,所以尽量避免使用它们。
这是一个简单的例子
use strict;
use warnings;
print "Start of script\n";
run_sleep();
print "End of script\n";
sub run_sleep {
my $pid = fork;
return if $pid; # in the parent process
print "Running child process\n";
select undef, undef, undef, 5;
print "Done with child process\n";
exit; # end child process
}
如果你在shell中运行它,你会看到如下所示的输出:
Start of script
End of script
Running child process
(等五秒钟)
Done with child process
父进程将立即退出并返回到您的shell; 子进程将在五秒后将其输出发送到您的shell。
使用线程:
use strict;
use warnings;
use threads;
my $thr = threads->new(\&sub1, "Param 1", "Param 2");
sub sub1 {
sleep 5;
print "In the thread:".join(",", @_),"\n";
}
for (my $c = 0; $c < 10; $c++) {
print "$c\n";
sleep 1;
}
$thr->join();
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