Perl不會找到Thread :: Semaphore的down_force方法嗎？

Question

我驗證該包一起安裝的perldoc -l主題::信號，但我仍然得到這個錯誤： Can't locate object method "down_force" via package "Thread::Semaphore" at <filename line#>

我的代碼：

: #use perl 
    eval 'exec perl -S $0 ${1+"$@"}' 
    if 0; 

use threads; 
use threads::shared; 
use Thread::Semaphore; 

my $s = Thread::Semaphore->new(); 

$s->down_force(); #it complains about this one 

#some code here... 

Answer 1

你可能有version 2.09 of Thread::Semaphore，這不有down_force()方法。嘗試升級到目前爲2.12的most recent version。