add loader shutdown example

samples/00_loadershutdown/CMakeLists.txt

@@ -0,0 +1,10 @@
+# Copyright (c) 2023 Ben Ashbaugh
+#
+# SPDX-License-Identifier: MIT
+
+add_opencl_sample(
+    TEST
+    NUMBER 00
+    TARGET loadershutdown
+    VERSION 100
+    SOURCES main.cpp)

samples/00_loadershutdown/main.cpp

@@ -0,0 +1,78 @@
+/*
+// Copyright (c) 2023 Ben Ashbaugh
+//
+// SPDX-License-Identifier: MIT
+*/
+
+#include <stdio.h>
+#include <vector>
+#include <popl/popl.hpp>
+
+#include <CL/opencl.hpp>
+
+typedef cl_int (*pfn_clShutdownOCLICD)(void);
+pfn_clShutdownOCLICD clShutdownOCLICD = NULL;
+
+int main(
+    int argc,
+    char** argv )
+{
+    {
+        popl::OptionParser op("Supported Options");
+
+        bool printUsage = false;
+        try {
+            op.parse(argc, argv);
+        } catch (std::exception& e) {
+            fprintf(stderr, "Error: %s\n\n", e.what());
+            printUsage = true;
+        }
+
+        if (printUsage || !op.unknown_options().empty() || !op.non_option_args().empty()) {
+            fprintf(stderr,
+                "Usage: loadershutdown [options]\n"
+                "%s", op.help().c_str());
+            return -1;
+        }
+    }
+
+
+    clShutdownOCLICD = (pfn_clShutdownOCLICD)
+        clGetExtensionFunctionAddress("clShutdownOCLICD");
+
+    if (clShutdownOCLICD == NULL) {
+        printf("Couldn't get function pointer to clShutdownOCLICD!\n");
+        printf("This is normal and some ICD loaders do not support this functionality.\n");
+        printf("Exiting...\n");
+        return 0;
+    }
+
+    std::vector<cl::Platform> platforms;
+    cl::Platform::get(&platforms);
+
+    printf("Before shutting down: queried %zu platforms.\n", platforms.size());
+    for (const auto& platform: platforms) {
+        cl_int errorCode = CL_SUCCESS;
+        auto name = platform.getInfo<CL_PLATFORM_NAME>(&errorCode);
+        if (errorCode == CL_SUCCESS) {
+            printf("\tPlatform: %s\n", name.c_str());
+        } else {
+            printf("\tQuery returned %d\n", errorCode);
+        }
+    }
+
+    clShutdownOCLICD();
+
+    printf("\nAfter shutting down:\n");
+    for (const auto& platform: platforms) {
+        cl_int errorCode = CL_SUCCESS;
+        auto name = platform.getInfo<CL_PLATFORM_NAME>(&errorCode);
+        if (errorCode == CL_SUCCESS) {
+            printf("\tPlatform: %s\n", name.c_str());
+        } else {
+            printf("\tQuery returned %d\n", errorCode);
+        }
+    }
+
+    return 0;
+}

samples/CMakeLists.txt

@@ -78,6 +78,7 @@ add_subdirectory( 00_enumopenclpp )
 add_subdirectory( 00_enumqueuefamilies )
 add_subdirectory( 00_extendeddevicequeries )
 add_subdirectory( 00_loaderinfo )
+add_subdirectory( 00_loadershutdown )
 add_subdirectory( 00_newqueries )
 add_subdirectory( 00_newqueriespp )
 add_subdirectory( 01_copybuffer )