[SYCL] E2E for delayed buffer destruction

SYCL/Basic/buffer/buffer_release.cpp

@@ -0,0 +1,33 @@
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t.out
+// RUN: %CPU_RUN_PLACEHOLDER %t.out
+
+#include <sycl/sycl.hpp>
+
+using namespace sycl;
+using namespace sycl::access;
+
+static constexpr size_t BUFFER_SIZE = 256;
+
+void test() {
+  queue Q;
+  std::unique_ptr<host_accessor<int>> HostAcc;
+  {
+    buffer<int, 1> Buffer{BUFFER_SIZE};
+    HostAcc.reset(new host_accessor(Buffer));
+    // Host accessor should block kernel execution
+    Q.submit([&](handler &CGH) {
+      auto Acc = Buffer.template get_access<mode::write>(CGH);
+      CGH.parallel_for<class Test>(BUFFER_SIZE,
+                                   [=](item<1> Id) { Acc[Id] = 0; });
+    });
+    // Buffer destructor should not wait till all operations completion here
+  }
+  // Unblock kernel execution
+  HostAcc.reset(nullptr);
+  Q.wait();
+}
+
+int main() {
+  test();
+  return 0;
+}