Add 'third_party/nix/' from commit 'be66c7a6b24e3c3c6157fd37b86c7203d14acf10'

git-subtree-dir: third_party/nix
git-subtree-mainline: cf8cd640c1
git-subtree-split: be66c7a6b24e3c3c6157fd37b86c7203d14acf10

third_party/nix/tests/parallel.builder.sh

@@ -0,0 +1,29 @@
+echo "DOING $text"
+
+
+# increase counter
+while ! ln -s x $shared.lock 2> /dev/null; do
+    sleep 1
+done
+test -f $shared.cur || echo 0 > $shared.cur
+test -f $shared.max || echo 0 > $shared.max
+new=$(($(cat $shared.cur) + 1))
+if test $new -gt $(cat $shared.max); then
+    echo $new > $shared.max
+fi
+echo $new > $shared.cur
+rm $shared.lock
+
+
+echo -n $(cat $inputs)$text > $out
+
+sleep $sleepTime
+
+
+# decrease counter
+while ! ln -s x $shared.lock 2> /dev/null; do
+    sleep 1
+done
+test -f $shared.cur || echo 0 > $shared.cur
+echo $(($(cat $shared.cur) - 1)) > $shared.cur
+rm $shared.lock