Added test to verify flush on clReleaseCommandQueue with multiple queues (#2134)

Fixes #2087 according to task description.

test_conformance/api/test_queue.cpp

@@ -1,5 +1,5 @@
 //
-// Copyright (c) 2020 The Khronos Group Inc.
+// Copyright (c) 2024 The Khronos Group Inc.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -58,3 +58,61 @@ REGISTER_TEST(queue_flush_on_release)
 
     return success ? TEST_PASS : TEST_FAIL;
 }
+
+REGISTER_TEST(multi_queue_flush_on_release)
+{
+    cl_int err;
+
+    // Create A command queue
+    cl_command_queue queue_A = clCreateCommandQueue(context, device, 0, &err);
+    test_error(err, "Could not create command queue A");
+
+    // Create B command queue
+    cl_command_queue queue_B = clCreateCommandQueue(context, device, 0, &err);
+    test_error(err, "Could not create command queue B");
+
+    // Create a kernel
+    clProgramWrapper program;
+    clKernelWrapper kernel;
+    const char *source = "void kernel test(){}";
+    err = create_single_kernel_helper(context, &program, &kernel, 1, &source,
+                                      "test");
+    test_error(err, "Could not create kernel");
+
+    // Enqueue the kernel on queue_A and obtain event to synchronize with
+    // queue_B
+    size_t gws = num_elements;
+    clEventWrapper event_A;
+    err = clEnqueueNDRangeKernel(queue_A, kernel, 1, nullptr, &gws, nullptr, 0,
+                                 nullptr, &event_A);
+    test_error(err, "Could not enqueue kernel");
+
+    // Enqueue the kernel on queue_B using event_A for synchronization and
+    // create event_B to track completion
+    clEventWrapper event_B;
+    err = clEnqueueNDRangeKernel(queue_B, kernel, 1, nullptr, &gws, nullptr, 1,
+                                 &event_A, &event_B);
+    test_error(err, "Could not enqueue kernel");
+
+    // Release queue_A, which performs an implicit flush to issue any previously
+    // queued OpenCL commands
+    err = clReleaseCommandQueue(queue_A);
+    test_error(err, "clReleaseCommandQueue failed");
+
+    err = clFlush(queue_B);
+    test_error(err, "clFlush failed");
+
+    // Wait for kernel to execute since the queue must flush on release
+    bool success = poll_until(2000, 50, [&event_B]() {
+        cl_int status;
+        cl_int err = clGetEventInfo(event_B, CL_EVENT_COMMAND_EXECUTION_STATUS,
+                                    sizeof(cl_int), &status, nullptr);
+        if ((err != CL_SUCCESS) || (status != CL_COMPLETE))
+        {
+            return false;
+        }
+        return true;
+    });
+
+    return success ? TEST_PASS : TEST_FAIL;
+}