# Sereal doesn't have dclone
sub deep_clone { ipc_thaw(ipc_freeze($_[-1])) }
+sub detect_nproc () {
+ # _SC_NPROCESSORS_ONLN = 84 on both Linux glibc and musl
+ return POSIX::sysconf(84) if $^O eq 'linux';
+ return POSIX::sysconf(58) if $^O eq 'freebsd';
+ # TODO: more OSes
+
+ # getconf(1) is POSIX, but *NPROCESSORS* vars are not
+ for (qw(_NPROCESSORS_ONLN NPROCESSORS_ONLN)) {
+ `getconf $_ 2>/dev/null` =~ /^(\d+)$/ and return $1;
+ }
+ for my $nproc (qw(nproc gnproc)) { # GNU coreutils nproc
+ `$nproc 2>/dev/null` =~ /^(\d+)$/ and return $1;
+ }
+
+ # should we bother with `sysctl hw.ncpu`? Those only give
+ # us total processor count, not online processor count.
+ undef
+}
+
1;