source common.sh


# First, test that -jN performs builds in parallel.
echo "testing nix-build -j..."

TODO_NixOS

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