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bug#11197: problems with string ports and unicode


From: Ludovic Courtès
Subject: bug#11197: problems with string ports and unicode
Date: Wed, 20 Jun 2012 23:03:02 +0200
User-agent: Gnus/5.130005 (Ma Gnus v0.5) Emacs/24.1 (gnu/linux)

Hi,

address@hidden (Ludovic Courtès) skribis:

> Indeed, it’s stuck in a deadlock:
>
> (gdb) bt
> #0  0x00007ffff75e1204 in __lll_lock_wait () from 
> /nix/store/vxycd107wjbhcj720hzkw2px7s7kr724-glibc-2.12.2/lib/libpthread.so.0
> #1  0x00007ffff75dc4d4 in _L_lock_999 () from 
> /nix/store/vxycd107wjbhcj720hzkw2px7s7kr724-glibc-2.12.2/lib/libpthread.so.0
> #2  0x00007ffff75dc2ea in pthread_mutex_lock () from 
> /nix/store/vxycd107wjbhcj720hzkw2px7s7kr724-glibc-2.12.2/lib/libpthread.so.0
> #3  0x00007ffff7b30499 in scm_dynwind_pthread_mutex_lock 
> (mutex=0x7ffff7dd28c0) at threads.c:1962
> #4  0x00007ffff7b2bb0e in scm_mkstrport (pos=0x2, str=0x4, modes=327680, 
> caller=<value optimized out>) at strports.c:287
> #5  0x00007ffff7aac20b in display_backtrace_body (a=0x7fffffffc1a0) at 
> backtrace.c:487
> #6  0x00007ffff7b46c7b in vm_regular_engine (vm=0x6f61f0, program=0x7f5d50, 
> argv=0x6fa3b0, nargs=-1) at vm-i-system.c:895
> #7  0x00007ffff7ac039e in scm_call_3 (proc=0x7f5d50, arg1=<value optimized 
> out>, arg2=<value optimized out>, arg3=<value optimized out>) at eval.c:500
> #8  0x00007ffff7b32504 in scm_internal_catch (tag=<value optimized out>, 
> body=<value optimized out>, body_data=<value optimized out>, handler=<value 
> optimized out>, handler_data=<value optimized out>) at throw.c:222
> #9  0x00007ffff7aabbba in scm_display_backtrace_with_highlights (stack=<value 
> optimized out>, port=<value optimized out>, first=<value optimized out>, 
> depth=<value optimized out>, highlights=<value optimized out>)
>     at backtrace.c:558
> #10 0x00007ffff7ab725e in print_exception_and_backtrace (error_port=0x6f6170, 
> tag=0x66d4c0, args=0x8e6ea0) at continuations.c:490
> #11 pre_unwind_handler (error_port=0x6f6170, tag=0x66d4c0, args=0x8e6ea0) at 
> continuations.c:534
> #12 0x00007ffff7b46c7b in vm_regular_engine (vm=0x6f61f0, program=0x7f3ce0, 
> argv=0x6fa300, nargs=-1) at vm-i-system.c:895
> #13 0x00007ffff7b4846e in scm_call_with_vm (vm=0x6f61f0, proc=0x7f3ce0, 
> args=<value optimized out>) at vm.c:878
> #14 0x00007ffff7b296db in scm_to_stringn (str=0x8dba80, lenp=0x7fffffffc4e8, 
> encoding=<value optimized out>, handler=SCM_FAILED_CONVERSION_ERROR) at 
> strings.c:2102
> #15 0x00007ffff7b2bb73 in scm_mkstrport (pos=0x2, str=0x8dba80, modes=196608, 
> caller=<value optimized out>) at strports.c:312
>
> This could be fixed by calling ‘scm_new_port_table_entry’ after having
> prepared the backing buffer, but the problem is that ‘pt->encoding’ is
> needed before.

Fixed in 03fcf93bff9f02a3d12ab86be4e67b996310aad4 (not particularly
elegant, but I couldn’t think of a better way.)  The test in that commit
captures the initial problem.

I’m marking this bug as “done”.  If you would like to discuss string
port encodings, separate binary/textual ports, or any other significant
change, you’re welcome to do so on address@hidden, of course.

Thanks!

Ludo’.





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