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use 5.005; |
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|
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use strict; |
| 4 |
use ExtUtils::MakeMaker; |
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use Config; |
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|
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$|=1; |
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|
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my $DEFINE; |
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my @LIBS = []; |
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|
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# check for completely broken platforms (such as netbsd) |
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if ($Config{usethreads} && $^O eq "netbsd") { |
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print <<EOF; |
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|
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*** |
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*** Your platform is BROKEN - netbsd pthreads are known to be completely broken. |
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*** There is *no* way to implement coroutines on this platform until the bugs |
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*** are fixed (this has been true for at least netbsd version 4.0). |
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*** |
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*** This affects many modules currently, so the recommended build option |
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*** for perl is to DISABLE THREAD support - it serves no practical purpose |
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*** on POSIX systems anyways, except that it slows down your programs a lot |
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*** and uses a lot more memory than fork (perl threads do not give you threads, |
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*** they are only windows-process emulation ported to unix). |
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*** |
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*** If you really want to try building Coro on your broken platform, enter |
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*** "yes" at the prompt - report back if the bugs is fixed please. (Oh, |
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*** and try out BDB or IO::AIO which suffer from other threading bugs on |
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*** netbsd that never seem to get fixed). |
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*** |
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|
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EOF |
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|
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print "prompt> "; <STDIN> =~ /^yes/ or exit 1; |
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} |
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|
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print <<EOF; |
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|
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*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
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|
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Coro has a number of configuration options. Due to its maturity, the |
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defaults that Coro chooses are usually fine, so you can decide to skip |
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these questions. Only if something went wrong you should select 'n' |
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here and manually configure Coro, and, of course, report this to the |
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maintainer :) |
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|
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EOF |
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|
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if (prompt ("Skip further questions and use defaults (y/n)?", "y") =~ /[yY]/) { |
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$ENV{PERL_MM_USE_DEFAULT} = 1; |
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} |
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|
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|
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$DEFINE .= " -DHAVE_MMAP" if $Config{d_mmap} eq "define" && $Config{d_munmap} eq "define"; |
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|
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my $iface; |
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|
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if (exists $ENV{CORO_INTERFACE}) { |
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$iface = $ENV{CORO_INTERFACE}; |
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|
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} elsif ($^O =~ /win32/i or $^O =~ /cygwin/ or $^O =~ /mswin/) { |
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$iface = 'w'; |
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|
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} elsif ($^O =~ /irix/) { |
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$iface = "i"; |
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|
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} elsif ($^O =~ /linux/) { |
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# default to assembly on x86 and x86_64, and setjmp on others |
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$iface = $Config{archname} =~ /^(i[3456]86|amd64|x86_64)-/ && $Config{optimize} =~ /-O/ ? "a" : "s"; |
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|
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} elsif ($^O =~ /(free|net|open)bsd/) { |
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# FreeBSD 4.x has ucontext.h but no makecontext et al. (see BUGS section of |
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# man context). Assume the same problem for all other BSDs. |
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|
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# netbsd is totally broken (pthreads are incomaptible with ucontext or other stack switchign mechanisms) |
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|
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# therefore, default to setjmp |
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$iface = "s"; |
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|
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} elsif ($^O =~ /solaris/) { |
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$iface = "s"; |
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|
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} elsif ($^O =~ /darwin/) { |
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$iface = "s"; |
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|
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} elsif ($^O =~ /dragonfly/) { |
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# ucontext is totally broken on dragonfly bsd: |
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# Fatal error 'siglongjmp()ing between thread contexts is undefined by POSIX 1003.1 |
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$iface = "s"; |
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|
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} elsif (-e "/usr/include/ucontext.h") { # shame on this heuristic |
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$iface = "u"; |
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|
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} else { |
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$iface = "s"; |
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} |
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|
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print <<EOF; |
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|
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*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
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|
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Coro can use a number of methods to implement coroutines at the C |
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level. The default chosen is based on your current confguration and is |
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correct in most cases, but you still can chose between these alternatives: |
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|
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u The unix 'ucontext.h' functions are relatively new and not implemented |
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or well-tested in older unices. They allow very fast coroutine creation |
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and reasonably fast switching, and, most importantly, are very stable. |
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They are, however, usually slower than the other alternatives due to an |
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extra syscall done by swapcontext. |
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|
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s If the ucontext functions are not working or you don't want |
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to use them for other reasons you can try a workaround using |
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setjmp/longjmp/sigaltstack (also standard unix functions). Coroutine |
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creation is rather slow, but switching is very fast (often much faster |
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than with the ucontext functions). Unfortunately, glibc-2.1 and |
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below don't even feature a working sigaltstack. You cannot use this |
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implementation if some other code uses SIGUSR2 or you plan to |
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create coroutines from an alternative signal stack, as both are being |
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used for coroutine creation. |
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|
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a Handcoded assembly. This is the fastest and most compatible method |
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with the least side effects, if it works, that is. It has been tested |
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on GNU/Linux x86 and x86_64 systems and should work on all x86/x86_64 |
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systems using the SVR ELF ABI (it is also reported to be working on |
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Strawberry Perl for Windows using MinGW). This is the recommended |
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method on supported platforms. Note that you usually have to compile |
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this module with optimisation enabled for this method to work. When in |
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doubt, use another method, such as (s)etjmp/longjmp. |
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|
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l GNU/Linux. Very old GNU/Linux systems (glibc-2.1 and below) need |
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this hack. Since it is very linux-specific it is also quite fast and |
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recommended even for newer versions; when it works, that is (currently |
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x86 and a few others only. If it compiles, it's usually ok). Newer |
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glibc versions (>= 2.5) stop working with this implementation again. |
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|
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i IRIX. For some reason, SGI really does not like to follow the single |
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unix specification (does that surprise you?), so this workaround might |
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be needed (it's fast), although [s] and [u] should also work now. |
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|
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w Microsoft Windows. Try this on Microsoft Windows when using Cygwin or |
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the MSVC compilers (e.g. ActiveState Perl, but see "a" for Strawberry |
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Perl), although, as there is no standard on how to do this under |
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windows, different environments might work differently. Doh. |
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|
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p Use pthread API. Try to avoid this option, it was only created to make |
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a point about the programming language shootout and might leak threads. |
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It might work fine as a last resort, however. |
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|
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For most systems, the default chosen should be OK. If you experience |
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problems then you should experiment with this setting and/or turn |
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optimisations on or off (make OPTIMIZE=-O or -O0). |
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|
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EOF |
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|
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retry: |
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|
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my $r = prompt "Use which implementation,\n" . |
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"<s>et/longjump, <u>context, <a>ssembly, <i>rix, <l>inux or <w>indows?", |
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$iface; |
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$iface = lc $1 if $r =~ /(\S)/; |
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|
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if ($iface eq "u") { |
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$DEFINE .= " -DCORO_UCONTEXT"; |
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print "\nUsing ucontext implementation\n\n"; |
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conftest ("TEST_makecontext"); |
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} elsif ($iface eq "s") { |
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$DEFINE .= " -DCORO_SJLJ"; |
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print "\nUsing setjmp/longjmp/sigaltstack implementation\n\n"; |
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conftest ("TEST_sigaltstack"); |
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} elsif ($iface eq "l") { |
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$DEFINE .= " -DCORO_LINUX"; |
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print "\nUsing linux-specific implementation\n\n"; |
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} elsif ($iface eq "i") { |
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$DEFINE .= " -DCORO_IRIX"; |
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print "\nUsing irix-specific implementation\n\n"; |
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} elsif ($iface eq "w") { |
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$DEFINE .= " -DCORO_LOSER"; |
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print "\nUsing windows-specific implementation\n\n"; |
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} elsif ($iface eq "a") { |
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$DEFINE .= " -DCORO_ASM"; |
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print "\nUsing handcoded assembly implementation\n\n"; |
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} elsif ($iface eq "p") { |
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$DEFINE .= " -DCORO_PTHREAD"; |
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@LIBS = ["-lpthread"]; |
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print "\nUsing pthread implementation\n\n"; |
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} else { |
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print "\nUnknown implementation \"$iface\"\n"; |
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goto retry; |
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} |
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|
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print <<EOF; |
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|
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*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
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|
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Per-context stack size factor: Depending on your settings, Coro tries to |
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share the C stacks is creates as much as possible, but sometimes it needs |
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to allocate a new one. This setting controls the maximum size that gets |
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allocated, and should not be set too high, as memory and address space |
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still is wasted even if it's not fully used. The value entered will be |
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multiplied by sizeof(long), which is usually 4 on 32-bit systems, and 8 on |
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64-bit systems. |
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|
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A setting of 16384 (the default) therefore corresponds to a 64k..128k |
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stack, which usually is ample space (you might even want to try 8192 or |
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lower if your program creates many coroutines). |
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|
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On systems supporting mmap and dynamic memory management, the actual |
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memory usually gets allocated on demand, but with many large stacks you |
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can still run out of address space on your typical 32 bit platform (not to |
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forget the pagetables). |
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|
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Some perls (mostly threaded ones and perl compiled under linux 2.6) and |
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some programs (inefficient regexes can use a lot of stack space) may |
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need much, much more: If Coro segfaults with weird backtraces (e.g. in a |
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function prologue) or in t/10_bugs.t, you might want to increase this to |
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65536 or more. |
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|
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The default should be fine, and can be changed at runtime with |
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Coro::State::cctx_stacksize. |
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|
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EOF |
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|
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my $stacksize = prompt ("C stack size factor?", "16384"); |
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$DEFINE .= " -DCORO_STACKSIZE=$stacksize"; |
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|
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print "using a stacksize of $stacksize * sizeof(long)\n"; |
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|
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print <<EOF; |
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|
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*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
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|
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Coro can optionally put a guard area before each stack segment: When the |
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stack is too small and the access is not too far outside the stack (i.e. |
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within the guard area), then the program will safely segfault instead of |
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running into other data. The cost is some additional overhead with is |
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usually negligible, and extra use of address space. |
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|
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The guard area size currently needs to be specified in pages (typical |
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pagesizes are 4k and 8k). The guard area is only enabled on a few |
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hardcoded architectures and is ignored on others. The actual preprocessor |
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expression disables this feature if: |
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|
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!__i386 && !__x86_64 && !__powerpc && !__m68k \ |
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&& !__alpha && !__mips && !__sparc64 |
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|
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The default, as usual, should be just fine. |
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|
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EOF |
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|
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my $stackguard = prompt ("Number of guard pages (0 disables)?", "4"); |
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$DEFINE .= " -DCORO_STACKGUARD=$stackguard"; |
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|
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print <<EOF; |
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|
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*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
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|
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Coro can tell valgrind about its stacks and so reduce spurious warnings |
| 260 |
where valgrind would otherwise complain about possible stack switches. |
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|
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Enabling this does not incur noticable runtime or memory overhead, but it |
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requires that you have the <valgrind/valgrind.h> header file available. |
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|
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Valgrind support is completely optional, so disabling it is the safe |
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choice. |
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|
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EOF |
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|
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my $valgrind = prompt ("Enable valgrind support (y/n)?", |
| 271 |
-r "/usr/include/valgrind/valgrind.h" ? "y" : "n"); |
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$DEFINE .= " -DCORO_USE_VALGRIND=1" if $valgrind =~ /[yY]/; |
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|
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|
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print <<EOF; |
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|
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*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
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|
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Coro can use (or even trick) some perl functions into doing what it needs |
| 280 |
instead of relying on (some) of its own functions. This might increase |
| 281 |
chances that it compiles and works, but it could just as well result in |
| 282 |
memory leaks, crashes or silent data corruption. It certainly does result |
| 283 |
in slightly slower speed and higher memory consumption, though, so YOU |
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SHOULD ENABLE THIS OPTION ONLY AS A LAST RESORT. |
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|
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EOF |
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|
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my $use_internals = prompt ("Prefer perl functions over coro functions (y/n)?", "n"); |
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$DEFINE .= " -DCORO_PREFER_PERL_FUNCTIONS=1" if $use_internals =~ /[yY]/; |
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|
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print <<EOF; |
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|
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*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
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|
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EOF |
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|
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WriteMakefile( |
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NAME => "Coro::State", |
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VERSION_FROM => "State.pm", |
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DEFINE => $DEFINE, |
| 301 |
LIBS => @LIBS, |
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DIR => [], |
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); |
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|
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sub conftest { |
| 306 |
my $type = shift; |
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|
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print "\nTrying to detect stack growth direction (for $type)\n"; |
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print "You might see some warnings, this should not concern you.\n\n"; |
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system "$Config{cc} $Config{ccflags} -D$type libcoro/conftest.c"; |
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|
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my $res = qx<./a.out>; |
| 313 |
$res =~ s/\s+$//; |
| 314 |
my ($sp, $ss) = split /,/, $res; |
| 315 |
|
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print "\n\n*****************************************************************************\n"; |
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print "If the testsuite fails PLEASE provide the following information\n"; |
| 318 |
print "to Marc Lehmann <schmorp\@schmorp.de>: operating system name, version,\n"; |
| 319 |
print "architecture name and this string '$sp|$ss'. Thanks a lot!\n";#d# |
| 320 |
print "*****************************************************************************\n\n"; |
| 321 |
|
| 322 |
unlink "a.out"; |
| 323 |
unlink "conftestval"; |
| 324 |
} |
| 325 |
|
