From 67a076b360ae63d0d941faeec5b7fcd2f0461fe0 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sun, 20 May 2012 17:21:31 +0200
Subject: [PATCH] Removing warnings here and there

---
 lib/Slic3r.pm            | 2 +-
 lib/Slic3r/Config.pm     | 4 ++--
 lib/Slic3r/GUI/Plater.pm | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/lib/Slic3r.pm b/lib/Slic3r.pm
index be2e6dcae1..3801c92781 100644
--- a/lib/Slic3r.pm
+++ b/lib/Slic3r.pm
@@ -41,7 +41,7 @@ use Slic3r::Print::Object;
 use Slic3r::Surface;
 use Slic3r::TriangleMesh;
 
-our $threads            = $have_threads ? 2 : undef;
+our $threads            = $have_threads ? 2 : 1;
 
 # miscellaneous options
 our $notes              = '';
diff --git a/lib/Slic3r/Config.pm b/lib/Slic3r/Config.pm
index 64f9d78d9c..d291dcdb2b 100644
--- a/lib/Slic3r/Config.pm
+++ b/lib/Slic3r/Config.pm
@@ -536,9 +536,9 @@ sub validate {
     
     # -j, --threads
     die "Invalid value for --threads\n"
-        if defined $Slic3r::threads && $Slic3r::threads < 1;
+        if $Slic3r::threads < 1;
     die "Your perl wasn't built with multithread support\n"
-        if defined $Slic3r::threads && $Slic3r::threads > 1 && !$Slic3r::have_threads;
+        if $Slic3r::threads > 1 && !$Slic3r::have_threads;
 
     # --layer-height
     die "Invalid value for --layer-height\n"
diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 5c4a016c09..1da4fe755c 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -529,7 +529,7 @@ sub on_export_completed {
     my $self = shift;
     my ($message) = @_;
     
-    $self->{export_thread}->detach;
+    $self->{export_thread}->detach if $self->{export_thread};
     $self->{export_thread} = undef;
     $self->statusbar->SetCancelCallback(undef);
     $self->statusbar->StopBusy;
@@ -541,7 +541,7 @@ sub on_export_failed {
     my $self = shift;
     my ($message) = @_;
     
-    $self->{export_thread}->detach;
+    $self->{export_thread}->detach if $self->{export_thread};
     $self->{export_thread} = undef;
     $self->statusbar->SetCancelCallback(undef);
     $self->statusbar->StopBusy;