Bareword "threads::joinable" not allowed while "strict subs" in use

#!/usr/bin/perl
use warnings;
use strict;
use threads;

my $thread_num = 2;
foreach(1..10){
    if(threads->list()>=$thread_num){
        sleep(1);
        foreach my $thr (threads->list(threads::joinable)){
            $thr->join();
        }
    }
    
    threads->create(\&runthread,$_);
}

while(threads->list()){
    sleep(10);
    foreach my $thr (threads->list(threads::joinable)){
          $thr->join();
    }
}

exit(0);


sub runthread
{
    print($_[0],"\n");
    print(threads->list(),"\n");
    return 0;
}
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The "perl -V" is:

Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
  Platform:
    osname=MSWin32, osvers=5.1, archname=MSWin32-x86-multi-thread
    uname=''
    config_args='undef'
    hint=recommended, useposix=true, d_sigaction=undef
    usethreads=define use5005threads=undef useithreads=define usemulti
+plicity=define
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='gcc', ccflags =' -s -O2 -DWIN32 -DHAVE_DES_FCRYPT  -DPERL_IMPL
+ICIT_CONTEXT -DPERL_IMPLICIT_SYS -fno-strict-aliasing -DPERL_MSVCRT_R
+EADFIX',
    optimize='-s -O2',
    cppflags='-DWIN32'
    ccversion='', gccversion='3.4.5', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='long lo
+ng', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='g++', ldflags ='-s -L"C:\strawberry\perl\lib\CORE" -L"C:\straw
+berry\c\lib"'
    libpth=C:\strawberry\c\lib
    libs= -lmsvcrt -lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool -
+lcomdlg32 -ladvapi32 -lshell32 -lole32 -loleaut32 -lnetapi32 -luuid -
+lws2_32 -lmpr -lwinmm -lversion -lodbc32 -lodbccp32
    perllibs= -lmsvcrt -lmoldname -lkernel32 -luser32 -lgdi32 -lwinspo
+ol -lcomdlg32 -ladvapi32 -lshell32 -lole32 -loleaut32 -lnetapi32 -luu
+id -lws2_32 -lmpr -lwinmm -lversion -lodbc32 -lodbccp32
    libc=-lmsvcrt, so=dll, useshrplib=yes, libperl=libperl58.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags='-mdll -s -L"C:\strawberry\perl\lib\CORE
+" -L"C:\strawberry\c\lib"'


Characteristics of this binary (from libperl): 
  Compile-time options: MULTIPLICITY PERL_IMPLICIT_CONTEXT
                        PERL_IMPLICIT_SYS PERL_MALLOC_WRAP
                        PL_OP_SLAB_ALLOC USE_ITHREADS USE_LARGE_FILES
                        USE_PERLIO
  Built under MSWin32
  Compiled at Oct 19 2008 16:39:57
  @INC:
    C:/strawberry/perl/lib
    C:/strawberry/perl/site/lib
    .
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