Threads? Now you have two problems. Why not processes? Sent from my iPhone
On 28 Jul 2013, at 20:07, Bob MacCallum <uncool...@gmail.com> wrote: > Sorry for the Perl question, but I'm a bit out of my depth... > > I have a Dancer app providing a web service, and I have another script > using the same Dancer config file and db schema (e.g. "use Dancer > qw/:script/"). This script watches the database (for changes made by the > web app) and does the "heavy lifting". Now I want to parallelise the heavy > lifting with threads and it seems from the core dump and googling that > DBD::Pg is not thread safe (see the few lines of debugger output below). > > That's fine - I am happy to run only non-database code in my "worker > threads". The trouble is that even if I do this, I think the > threads->create is threading the Dancer globals which include postgres > schema connections. > > I tried a few "no My::Schema; no DBD::Pg; no Dancer ..." declarations in > the block with the threads->create - but that didn't seem to help. > > Does anyone know how I can use thread-safe and thread-unsafe code in the > same script? I think I just need to make a block where none of the > Dancer/database stuff is in scope? > > I thought Thread::Isolate might help, but it hangs on the first test during > the install. It's dated 2005. > > thanks! > Bob. > > > > Reading symbols from > .../perl5/x86_64-linux-thread-multi/auto/DBD/Pg/Pg.so...done. > Loaded symbols for .../perl5/x86_64-linux-thread-multi/auto/DBD/Pg/Pg.so > Reading symbols from > /usr/local/pgsql_dir/postgresql-8.4.7/lib/libpq.so.5...(no debugging > symbols found)...done. > Loaded symbols for /usr/local/pgsql_dir/postgresql-8.4.7/lib/libpq.so.5 > Core was generated by `perl bin/maintain_populations-threaded.pl'. > Program terminated with signal 11, Segmentation fault. > #0 0x00007f9de39e923e in PerlIOEncode_getarg () from > /usr/lib/perl5/5.12.3/x86_64-linux-thread-multi/auto/PerlIO/encoding/encoding.so
