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.sh

@@ -0,0 +1,56 @@
+source common.sh
+
+
+# First, test that -jN performs builds in parallel.
+echo "testing nix-build -j..."
+
+clearStore
+
+rm -f $_NIX_TEST_SHARED.cur $_NIX_TEST_SHARED.max
+
+outPath=$(nix-build -j10000 parallel.nix --no-out-link)
+
+echo "output path is $outPath"
+
+text=$(cat "$outPath")
+if test "$text" != "abacade"; then exit 1; fi
+
+if test "$(cat $_NIX_TEST_SHARED.cur)" != 0; then fail "wrong current process count"; fi
+if test "$(cat $_NIX_TEST_SHARED.max)" != 3; then fail "not enough parallelism"; fi
+
+
+# Second, test that parallel invocations of nix-build perform builds
+# in parallel, and don't block waiting on locks held by the others.
+echo "testing multiple nix-build -j1..."
+
+clearStore
+
+rm -f $_NIX_TEST_SHARED.cur $_NIX_TEST_SHARED.max
+
+drvPath=$(nix-instantiate parallel.nix --argstr sleepTime 15)
+
+cmd="nix-store -j1 -r $drvPath"
+
+$cmd &
+pid1=$!
+echo "pid 1 is $pid1"
+
+$cmd &
+pid2=$!
+echo "pid 2 is $pid2"
+
+$cmd &
+pid3=$!
+echo "pid 3 is $pid3"
+
+$cmd &
+pid4=$!
+echo "pid 4 is $pid4"
+
+wait $pid1 || fail "instance 1 failed: $?"
+wait $pid2 || fail "instance 2 failed: $?"
+wait $pid3 || fail "instance 3 failed: $?"
+wait $pid4 || fail "instance 4 failed: $?"
+
+if test "$(cat $_NIX_TEST_SHARED.cur)" != 0; then fail "wrong current process count"; fi
+if test "$(cat $_NIX_TEST_SHARED.max)" != 3; then fail "not enough parallelism"; fi