请教关于Perl (use threads) 的一个小问题
Eleswen
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Eleswen 发表于 2008-03-14 15:56
请教关于Perl (use threads) 的一个小问题
这两天开始看一下Perl 的Multi-thread.
以下代码是从perldoc perlthrtut 中copy出来的，但是在我的本地测试中并不会hang (windows 和 Linux). use threads; my $a : shared = 4; my $b : shared = "foo"; my $thr1 = threads->new(sub { lock($a); sleep 20; lock($b); }); my $thr2 = threads->new(sub { lock($b); sleep 20; lock($a); }); This program will probably hang until you kill it. The only way it won’t hang is if one of the two threads acquires both locks first. A guaran‐ teed-to-hang version is more complicated, but the principle is the same. 简单起见： 如下Code: use threads; use threads::shared; my $total : shared = 0; lock($total); lock($total); 同样也不会Hang. ******************************************************** 请问，这是因为我用的Perl不支持lock还是因为我用的Code有问题？ 有人能给个建议吗？ 谢谢！ ******************************************************** 附: Perl Windows Version: C:\>perl -v This is perl, v5.8.8 built for MSWin32-x86-multi-thread (with 50 registered patches, see perl -V for more detail) Copyright 1987-2006, Larry Wall Binary build 820 [274739] provided by ActiveState http://www.ActiveState.com Built Jan 23 2007 15:57:46 Perl may be copied only under the terms of either the Artistic License or the GNU General Public License, which may be found in the Perl 5 source kit. Complete documentation for Perl, including FAQ lists, should be found on this system using "man perl" or "perldoc perl". If you have access to the Internet, point your browser at http://www.perl.org/, the Perl Home Page. C:\>perl -V Summary of my perl5 (revision 5 version 8 subversion 8) configuration: Platform: osname=MSWin32, osvers=4.0, archname=MSWin32-x86-multi-thread uname='' config_args='undef' hint=recommended, useposix=true, d_sigaction=undef usethreads=define use5005threads=undef useithreads=define usemultiplicity=define useperlio=define d_sfio=undef uselargefiles=define usesocks=undef use64bitint=undef use64bitall=undef uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='cl', ccflags ='-nologo -GF -W3 -MD -Zi -DNDEBUG -O1 -DWIN32 -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT -DNO_HASH_SEED -DUSE_SITECUSTOMIZE -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO -DPERL_MSVCRT_R EADFIX', optimize='-MD -Zi -DNDEBUG -O1', cppflags='-DWIN32' ccversion='12.00.8804', gccversion='', gccosandvers='' intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234 d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=10 ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='__int64', lseeksize=8 alignbytes=8, prototype=define Linker and Libraries: ld='link', ldflags ='-nologo -nodefaultlib -debug -opt:ref,icf -libpath:"C:\Perl\lib\CORE" -machine:x8 6' libpth=\lib libs= oldnames.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.li b ole32.lib oleaut32.lib netapi32.lib uuid.lib ws2_32.lib mpr.lib winmm.lib version.lib odbc32.lib odbccp3 2.lib msvcrt.lib perllibs= oldnames.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell3 2.lib ole32.lib oleaut32.lib netapi32.lib uuid.lib ws2_32.lib mpr.lib winmm.lib version.lib odbc32.lib odb ccp32.lib msvcrt.lib libc=msvcrt.lib, so=dll, useshrplib=yes, libperl=perl58.lib gnulibc_version='' Dynamic Linking: dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' ' cccdlflags=' ', lddlflags='-dll -nologo -nodefaultlib -debug -opt:ref,icf -libpath:"C:\Perl\lib\CORE" -machine:x86' 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 USE_SITECUSTOMIZE Locally applied patches: ActivePerl Build 820 [274739] Iin_load_module moved for compatibility with build 806 PerlEx support in CGI::Carp Less verbose ExtUtils::Install and Pod::Find Patch for CAN-2005-0448 from Debian with modifications Rearrange @INC so that 'site' is searched before 'perl' Partly reverted 24733 to preserve binary compatibility 29930 win32.c typo in #define MULTIPLICITY 29868 win32_async_check() can still loop indefinitely 29690,29732 ANSIfy the PATH environment variable on Windows 29689 Add error handling to win32_ansipath 29675 Use short pathnames in $^X and @INC 29607,29676 allow blib.pm to be used for testing Win32 module 29605 Implement killpg() for MSWin32 29598 cwd() to return the short pathname 29597 let readdir() return the alternate filename 29590 Don't destroy the Unicode system environment on Perl startup 29528 get ext/Win32/Win32.xs to compile on cygwin 29509,29510,29511 Move Win32::* functions into Win32 module 29483 Move Win32 from win32/ext/Win32 to ext/Win32 29481 Makefile.PL changes to compile Win32.xs using cygwin 28671 Define PERL_NO_DEV_RANDOM on Windows 28376 Add error checks after execing PL_cshname or PL_sh_path 28305 Pod::Html should not convert "foo" into ``foo'' 27833 Change anchor generation in Pod::Html for '=item item 2' 27832,27847 fix Pod::Html::depod() for multi-line strings 27719 Document the functions htmlify() and anchorify() in Pod::Html 27619 Bug in Term::ReadKey being triggered by a bug in Term::ReadLine 27549 Move DynaLoader.o into libperl.so 27528 win32_pclose() error exit doesn't unlock mutex 27527 win32_async_check() can loop indefinitely 27515 ignore directories when searching @INC 27359 Fix -d:Foo=bar syntax 27210 Fix quote typo in c2ph 27203 Allow compiling swigged C++ code 27200 Make stat() on Windows handle trailing slashes correctly 27133 Initialise lastparen in the regexp structure 27061 L<PerlIO> and Pod::Html 27034 Avoid "Prototype mismatch" warnings with autouse 26970 Make Passive mode the default for Net::FTP 26921 Avoid getprotobyname/number calls in IO::Socket::INET 26897,26903 Make common IPPROTO_* constants always available 26670 Make '-s' on the shebang line parse -foo=bar switches 26637 Make Borland and MinGW happy with change 26379 26536 INSTALLSCRIPT versus INSTALLDIRS 26379 Fix alarm() for Windows 2003 26087 Storable 0.1 compatibility 25861 IO::File performace issue 25084 long groups entry could cause memory exhaustion 24699 ICMP_UNREACHABLE handling in Net::Ping Built under MSWin32 Compiled at Jan 23 2007 15:57:46 @INC: C:/Perl/site/lib C:/Perl/lib . Perl Linux Version: root@Eleswen:/# perl -v This is perl, v5.8.8 built for i486-linux-gnu-thread-multi Copyright 1987-2006, Larry Wall Perl may be copied only under the terms of either the Artistic License or the GNU General Public License, which may be found in the Perl 5 source kit. Complete documentation for Perl, including FAQ lists, should be found on this system using "man perl" or "perldoc perl". If you have access to the Internet, point your browser at http://www.perl.org/, the Perl Home Page. root@Eleswen:/# perl -V Summary of my perl5 (revision 5 version 8 subversion 8) configuration: Platform: osname=linux, osvers=2.6.15.7, archname=i486-linux-gnu-thread-multi uname='linux terranova 2.6.15.7 #1 smp thu jul 12 14:27:56 utc 2007 i686 gnulinux ' config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i486-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.8 -Darchlib=/usr/lib/perl/5.8 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.8.8 -Dsitearch=/usr/local/lib/perl/5.8.8 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Uusesfio -Uusenm -Duseshrplib -Dlibperl=libperl.so.5.8.8 -Dd_dosuid -des' hint=recommended, useposix=true, d_sigaction=define usethreads=define use5005threads=undef useithreads=define usemultiplicity=define useperlio=define d_sfio=undef uselargefiles=define usesocks=undef use64bitint=undef use64bitall=undef uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-O2', cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include' ccversion='', gccversion='4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)', gccosandvers='' intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12 ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=4, prototype=define Linker and Libraries: ld='cc', ldflags =' -L/usr/local/lib' libpth=/usr/local/lib /lib /usr/lib libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt perllibs=-ldl -lm -lpthread -lc -lcrypt libc=/lib/libc-2.6.1.so, so=so, useshrplib=true, libperl=libperl.so.5.8.8 gnulibc_version='2.6.1' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E' cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib' Characteristics of this binary (from libperl): Compile-time options: MULTIPLICITY PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP THREADS_HAVE_PIDS USE_ITHREADS USE_LARGE_FILES USE_PERLIO USE_REENTRANT_API Built under linux Compiled at Dec 4 2007 08:56:39 @INC: /etc/perl /usr/local/lib/perl/5.8.8 /usr/local/share/perl/5.8.8 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.8 /usr/share/perl/5.8 /usr/local/lib/site_perl . |