Function test_backend

test/backend.cpp:87–104

using af::getActiveBackend;

void test_backend(std::atomic<int>& counter, int ntests,
                  af::Backend default_backend, af::Backend test_backend) {
    auto ta_backend = getActiveBackend();
    ASSERT_EQ(default_backend, ta_backend);

    // Wait until all threads reach this point
    counter++;
    while (counter < ntests) {}

    setBackend(test_backend);

    // Wait until all threads reach this point
    counter++;
    while (counter < 2 * ntests) {}

    ta_backend = getActiveBackend();
    ASSERT_EQ(test_backend, ta_backend);
}

TEST(Backend, Threads) {
    using std::thread;