p5pRT
commented
12 years ago From @Leont
This is a bug report for perl from fawaka@gmail.com\, generated with the help of perlbug 1.39 running under perl 5.14.2.
Currently\, %SIG doesn't set the system level signal handler for threads other than the main thread (a feature commented in 7-fold with the title of this bug report). This means that one can not set a signal handler for system signals unless the parent thread also has set a signal handler for it (threads.pm's pseudo-signals are nothing more than setting a flag in the deferred signal queue\, they bypass the real signaling system entirely\, making it useless for many if not most purposes).
The complication here is this: system signal handlers are process-wide (contrary to signal masks\, which are per-thread)\, whereas perl's idea of signal handlers is per interpreter (which usually but not necessarily overlaps with a thread). Handling this correctly is rather problematic.
POSIX::sigaction does do exactly what it advertises: actually set a signal handler no matter what.
Flags: category=core severity=low
Site configuration information for perl 5.14.2:
Configured by leon at Tue Jan 17 21:29:06 CET 2012.
Summary of my perl5 (revision 5 version 14 subversion 2) configuration:
Platform: osname=linux\, osvers=3.0.0-14-generic\, archname=x86_64-linux-thread-multi uname='linux leon-laptop 3.0.0-14-generic #23-ubuntu smp mon nov 21 20:28:43 utc 2011 x86_64 x86_64 x86_64 gnulinux ' config_args='-de -Dprefix=/home/leon/perl5/perlbrew/perls/perl-5.14.2 -Dusethreads' hint=recommended\, useposix=true\, d_sigaction=define useithreads=define\, usemultiplicity=define useperlio=define\, d_sfio=undef\, uselargefiles=define\, usesocks=undef use64bitint=define\, use64bitall=define\, uselongdouble=undef usemymalloc=n\, bincompat5005=undef Compiler: cc='cc'\, ccflags ='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'\, optimize='-O2'\, cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include' ccversion=''\, gccversion='4.6.1'\, gccosandvers='' intsize=4\, longsize=8\, ptrsize=8\, doublesize=8\, byteorder=12345678 d_longlong=define\, longlongsize=8\, d_longdbl=define\, longdblsize=16 ivtype='long'\, ivsize=8\, nvtype='double'\, nvsize=8\, Off_t='off_t'\, lseeksize=8 alignbytes=8\, prototype=define Linker and Libraries: ld='cc'\, ldflags =' -fstack-protector -L/usr/local/lib' libpth=/usr/local/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib /usr/lib libs=-lnsl -ldb -ldl -lm -lcrypt -lutil -lpthread -lc perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc libc=\, so=so\, useshrplib=false\, libperl=libperl.a gnulibc_version='2.13' Dynamic Linking: dlsrc=dl_dlopen.xs\, dlext=so\, d_dlsymun=undef\, ccdlflags='-Wl\,-E' cccdlflags='-fPIC'\, lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector'
Locally applied patches:
@INC for perl 5.14.2: /home/leon/perl5/perlbrew/perls/perl-5.14.2/lib/site_perl/5.14.2/x86_64-linux-thread-multi /home/leon/perl5/perlbrew/perls/perl-5.14.2/lib/site_perl/5.14.2 /home/leon/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi /home/leon/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2 .
Environment for perl 5.14.2: HOME=/home/leon LANG=en_US.utf8 LANGUAGE=en_US:en_GB:en LD_LIBRARY_PATH (unset) LOGDIR (unset) PATH=/home/leon/perl5/perlbrew/bin:/home/leon/perl5/perlbrew/perls/perl-5.14.2/bin:/home/leon/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games PERLBREW_HOME=/home/leon/.perlbrew PERLBREW_PATH=/home/leon/perl5/perlbrew/bin:/home/leon/perl5/perlbrew/perls/perl-5.14.2/bin PERLBREW_PERL=perl-5.14.2 PERLBREW_ROOT=/home/leon/perl5/perlbrew PERLBREW_VERSION=0.25 PERL_BADLANG (unset) SHELL=/bin/bash
Migrated from rt.perl.org#108758 (status was 'new')
Searchable as RT108758$