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#
# Copyright (C) 2008-2021 Alexis Bienvenüe <paamc@passoire.fr>
#
# This file is part of Auto-Multiple-Choice
#
# Auto-Multiple-Choice is free software: you can redistribute it
# and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 2 of
# the License, or (at your option) any later version.
#
# Auto-Multiple-Choice is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Auto-Multiple-Choice. If not, see
# <http://www.gnu.org/licenses/>.
use warnings;
use 5.012;
package AMC::Queue;
use AMC::Basic;
use Module::Load;
use Module::Load::Conditional qw/check_install/;
use File::Temp qw/ tempdir /;
use Storable;
# recupere le nombre de CPU, avec Sys::CPU si ce module est installe
sub get_ncpu {
my $n = 0;
if ( check_install( module => "Sys::CPU" ) ) {
load("Sys::CPU");
debug_pm_version("Sys::CPU");
$n = Sys::CPU::cpu_count();
} else {
open( CI, "/proc/cpuinfo" );
while (<CI>) {
$n++ if (/^processor\s*:/);
}
close(CI);
}
$n = 1 if ( $n <= 0 );
return ($n);
}
sub new {
my (%o) = @_;
my $self = {
pids => [],
queue => [],
pidof => {},
get_returned_values => 0,
'max.procs' => 0,
};
for my $k ( keys %o ) {
$self->{$k} = $o{$k} if ( defined( $self->{$k} ) );
}
if ( $self->{'max.procs'} < 1 ) {
$self->{'max.procs'} = get_ncpu();
debug "Max number of processes: " . $self->{'max.procs'};
}
if ( $self->{get_returned_values} ) {
$self->{returned} = [];
$self->{tmpdir} = tempdir( );
debug "Queue tmp dir: " . $self->{tmpdir};
}
bless $self;
return ($self);
}
sub add_process {
my ( $self, @o ) = @_;
push @{ $self->{queue} }, [@o];
}
sub maj {
my ($self) = @_;
my @p = ();
my %alive=();
for my $pid ( @{ $self->{pids} } ) {
if ( kill( 0, $pid ) ) {
push @p, $pid;
$alive{$pid} = 1;
}
}
@{ $self->{pids} } = @p;
debug "MAJ : " . join( ' ', @p );
if ( $self->{get_returned_values} ) {
opendir( my $dh, $self->{tmpdir} )
|| debug "Can't open $self->{tmpdir}: $!";
while ( readdir $dh ) {
if (/^[0-9]+$/ && !$alive{$self->{pidof}->{$_}}) {
my $f = $self->{tmpdir} . "/" . $_;
debug "Retrieving from $f";
$self->{returned}->[$_] = retrieve($f);
unlink($f);
}
}
closedir $dh;
}
return ( 1 + $#{ $self->{pids} } );
}
sub killall {
my ($self) = @_;
$self->{queue} = [];
debug_and_stderr "Queue interruption\n";
for my $p ( @{ $self->{pids} } ) {
debug_and_stderr "Queue: killing $p\n";
kill 9, $p;
}
}
sub run {
my ( $self, $subsys ) = @_;
debug "Queue RUN";
my $i = 0;
while ( @{ $self->{queue} } ) {
while ( $self->maj() < $self->{'max.procs'}
&& @{ $self->{queue} } )
{
my $cs = shift( @{ $self->{queue} } );
if ($cs) {
my $p = fork();
if ($p) {
debug "Fork : $p";
push @{ $self->{pids} }, $p;
$self->{pidof}->{$i} = $p;
} else {
if ( ref( $cs->[0] ) eq 'ARRAY' ) {
for my $c (@$cs) {
debug "Command [$$] : " . join( ' ', @$c );
if ( system(@$c) == 0 ) {
debug "Command [$$] OK";
} else {
debug "Error [$$] : $?\n";
}
}
exit(0);
} elsif ( ref( $cs->[0] ) eq 'CODE' ) {
my $c = shift @$cs;
my $ret = &$c(@$cs);
if($self->{get_returned_values}) {
store($ret, $self->{tmpdir} . "/" . $i);
}
exit(0);
} else {
no warnings 'exec';
debug "Command [$$] : " . join( ' ', @$cs );
exec(@$cs);
debug "Bad exec $$ [" . $cs->[0] . "] unknown command";
die "Unknown command";
}
}
$i++;
} else {
debug "Queue empty";
}
}
waitpid( -1, 0 );
}
while ( $self->maj() ) {
debug("Waiting for all childs to end...");
waitpid( -1, 0 );
}
debug("Leaving queue.");
rmdir $self->{tmpdir} if ( $self->{tmpdir} );
}
sub returned_values {
my ($self) = @_;
return ( $self->{returned} );
}
1;
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