- $usleep = \&Time::HiRes::usleep;
- } else {
- diag 'Using fallback usleep()';
- $usleep = sub {
- my $s = int($_[0] / 1e6);
- sleep $s if $s;
- };
+ return \&Time::HiRes::usleep;
+ } else {
+ return undef;
+ }
+ },
+ 'select' => sub {
+ if ($Config::Config{d_select}) {
+ diag 'Using select()-based fallback usleep()';
+ return sub ($) {
+ my $s = $_[0];
+ my $r = 0;
+ while ($s > 0) {
+ my ($found, $t) = select(undef, undef, undef, $s / 1e6);
+ last unless defined $t;
+ $t = int($t * 1e6);
+ $s -= $t;
+ $r += $t;
+ }
+ return $r;
+ };
+ } else {
+ return undef;
+ }
+ },
+ 'sleep' => sub {
+ diag 'Using sleep()-based fallback usleep()';
+ return sub ($) {
+ my $ms = int $_[0];
+ my $s = int($ms / 1e6) + ($ms % 1e6 == 0 ? 0 : 1);
+ my $t = sleep $s;
+ return $t * 1e6;
+ };
+ },
+ );
+
+ @impls = qw<Time::HiRes select sleep> unless @impls;
+
+ my $usleep;
+ for my $impl (@impls) {
+ next unless defined $impl and $impls{$impl};
+ $usleep = $impls{$impl}->();
+ last if defined $usleep;