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use strict; |
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use ExtUtils::MakeMaker; |
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use Config; |
4 |
|
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$|=1; |
6 |
|
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my $DEFINE; |
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my @LIBS = []; |
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|
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my $threads = $Config{usethreads}; |
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|
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use Config; |
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|
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print <<EOF; |
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|
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*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
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|
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Coro has a number of configuration options. Due to its maturity, the |
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defaults that Coro chooses are usually fine, so you can decide to skip |
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these questions. Only if something went wrong you should select 'n' |
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here and manually configure Coro, and, of course, report this to the |
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maintainer :) |
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|
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EOF |
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|
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if (prompt ("Skip further questions and use defaults (y/n)?", "y") =~ /[yY]/) { |
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$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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# default to assembly on x86 and x86_64 sometimes |
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my $iface_asm = $Config{archname} =~ /^(i[3456]86|amd64|x86_64)-/ ? "a" : undef; |
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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 $^O =~ /mswin/) { |
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# nothing works, really, without deep hacks |
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$iface = 'w'; |
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|
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} elsif ($^O =~ /irix/) { |
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# sigaltstack works like sigstack, i.e. expects stack pointer, not stack base |
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# but wikipeida lists it as 100% posix compliant. geeeee. |
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$iface = "i"; |
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|
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} elsif ($^O =~ /linux/) { |
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# everything "just works", as expected |
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$iface = $iface_asm || "s"; |
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|
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} elsif ($^O =~ /freebsd/) { |
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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). |
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# |
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# FreeBSD 6.2 has marginally working ucontext, setjmp and asm, but |
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# some 5.8.8's barf when threaded due to broken threading. |
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|
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$iface = $iface_asm || "s"; |
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|
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} elsif ($^O =~ /netbsd/) { |
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# netbsd is totally broken (pthreads are incompatible with ucontext or |
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# other stack switching mechanisms) therefore, default to pthread - |
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# hey, it might actually work, with some hacks. |
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$iface = "p"; |
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|
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if ($Config{libs} =~ "-lpthread") { |
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# uh-oh |
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print <<EOF; |
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|
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*** |
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*** WARNING: Your platform is known to have broken pthreads, which are |
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*** required for Coro because your platform is known to have broken |
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*** ucontext and setjmp/longjmp functions as well, which are broken |
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*** because your pthread library is broken. D'oh. |
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*** |
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*** Coro will try to fight this vicious circle of breakage, but YMMV. If |
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*** Coro fails, try to recompile your perl with -lpthread, which will work |
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*** around some of the pthread bugs. (You do not have to enable ithreads). |
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*** |
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|
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EOF |
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# ugh, pthreads need to be linked into the main program :/ |
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$iface = $iface_asm || "s"; |
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} |
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|
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} elsif ($^O =~ /(openbsd|mirbsd)/) { |
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# openbsd: |
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# asm seems to work, setjmp might, ucontext is missing, threads lets not talk about |
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# try setjmp/longjmp on 4.4, but pthread on earlier |
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# mirbsd: |
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# seems to be bug-to-bug compatible openbsd fork, |
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# with the name change being the biggest difference. |
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$iface = $iface_asm || ($Config{osvers} >= 4.4 ? "s" : "p"); |
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|
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} elsif ($^O =~ /solaris/) { |
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# setjmp, ucontext seem to work, as well as asm |
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$iface = $iface_asm || "s"; |
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|
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} elsif ($^O =~ /darwin/) { |
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# assembler doesn't support .type |
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# ucontext is of course totally broken (it just crashes) |
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# surprisingly, pthreads seem to work |
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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. They are, however, usually slower than |
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the other alternatives due to an extra syscall done by swapcontext. And |
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while nominally most portable (it's the only POSIX-standardised |
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interface for coroutines), ucontext functions are, as usual, broken on |
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most/all BSDs. |
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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 create |
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coroutines from an alternative signal stack, as both are being used for |
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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. When it doesn't work, use another |
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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 however. |
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|
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i IRIX. For some reason, SGI really does not like to follow POSIX (does |
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that surprise you?), so this workaround might be needed (it's fast), |
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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 |
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make a point about the programming language shootout. It is unlikely |
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to work with perls that have windows process emulation enabled ("perl |
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threads"). It is also likely the slowest method of implementing |
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coroutines. It might work fine as a last resort, however, as the |
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pthread API is slightly better tested than ucontext functions for |
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example. Of course, not on BSDs, who usually have very broken pthread |
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implementations. |
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|
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Coro tries hard to come up with a suitable default for most systems, |
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so pressing return at the prompt usually does the right thing. If you |
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experience problems (e.g. make test fails) then you should experiment with |
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this setting. |
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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 $r = prompt "Use which implementation,\n" . |
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"<s>etjmp, <u>ctx, <a>sm, <i>rix, <l>inux, <w>indows or <p>threads?", |
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$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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$DEFINE .= " -DCORO_ASM"; |
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print "\nUsing handcoded assembler implementation\n\n"; |
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} elsif ($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 = $^O eq "linux" && $] < 5.008008 ? 128 * 1024 : 16384; |
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|
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$stacksize = prompt ("C stack size factor?", $stacksize); |
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$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 |
277 |
|
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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"); |
283 |
$DEFINE .= " -DCORO_STACKGUARD=$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 |
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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 |
296 |
choice. |
297 |
|
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EOF |
299 |
|
300 |
my $valgrind = prompt ("Enable valgrind support (y/n)?", |
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-r "/usr/include/valgrind/valgrind.h" ? "y" : "n"); |
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$DEFINE .= " -DCORO_USE_VALGRIND=1" if $valgrind =~ /[yY]/; |
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|
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|
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print <<EOF; |
306 |
|
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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 |
310 |
instead of relying on (some) of its own functions. This might increase |
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chances that it compiles and works, but it could just as well result in |
312 |
memory leaks, crashes or silent data corruption. It certainly does result |
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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 |
317 |
|
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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; |
322 |
|
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*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
324 |
|
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Coro has experimental support for cloning states. This can be used |
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to implement a scheme-like call/cc. However, this doesn't add to the |
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expressiveness in general, and is likely perl-version specific. As such, |
328 |
it is disabled by default. Enable it when you want to play around with |
329 |
it, but note that it isn't supported, and unlikely ever will be. It |
330 |
exists mainly to prove that it could be done - if only it were useful for |
331 |
something. |
332 |
|
333 |
EOF |
334 |
|
335 |
my $masturbate = $ENV{CORO_CLONE} || "n"; |
336 |
$masturbate = prompt ("Implement Coro::State->clone method (y/n)?", $masturbate); |
337 |
$DEFINE .= " -DCORO_CLONE=1" if $masturbate =~ /[yY]/; |
338 |
|
339 |
print <<EOF; |
340 |
|
341 |
*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
342 |
|
343 |
EOF |
344 |
|
345 |
WriteMakefile( |
346 |
NAME => "Coro::State", |
347 |
VERSION_FROM => "State.pm", |
348 |
DEFINE => $DEFINE, |
349 |
LIBS => @LIBS, |
350 |
DIR => [], |
351 |
depend => { |
352 |
"State.c" => "state.h clone.c libcoro/coro.h libcoro/coro.c", |
353 |
}, |
354 |
); |
355 |
|
356 |
sub conftest { |
357 |
my $type = shift; |
358 |
|
359 |
print "\nTrying to detect stack growth direction (for $type)\n"; |
360 |
print "You might see some warnings, this should not concern you.\n\n"; |
361 |
system "$Config{cc} $Config{ccflags} -D$type libcoro/conftest.c"; |
362 |
|
363 |
my $res = qx<./a.out>; |
364 |
$res =~ s/\s+$//; |
365 |
my ($sp, $ss) = split /,/, $res; |
366 |
|
367 |
print "\n\n*****************************************************************************\n"; |
368 |
print "If the testsuite fails PLEASE provide the following information\n"; |
369 |
print "to Marc Lehmann <schmorp\@schmorp.de>: operating system name, version,\n"; |
370 |
print "architecture name and this string '$sp|$ss'. Thanks a lot!\n";#d# |
371 |
print "*****************************************************************************\n\n"; |
372 |
|
373 |
unlink "a.out"; |
374 |
unlink "conftestval"; |
375 |
} |
376 |
|