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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef TESTING_MULTIPROCESS_FUNC_LIST_H_ |
| 6 #define TESTING_MULTIPROCESS_FUNC_LIST_H_ |
| 7 |
| 8 #include <string> |
| 9 |
| 10 // This file provides the plumbing to register functions to be executed |
| 11 // as the main function of a child process in a multi-process test. |
| 12 // This complements the MultiProcessTest class which provides facilities |
| 13 // for launching such tests. |
| 14 // |
| 15 // The MULTIPROCESS_TEST_MAIN() macro registers a string -> func_ptr mapping |
| 16 // by creating a new global instance of the AppendMultiProcessTest() class |
| 17 // this means that by the time that we reach our main() function the mapping |
| 18 // is already in place. |
| 19 // |
| 20 // Example usage: |
| 21 // MULTIPROCESS_TEST_MAIN(a_test_func) { |
| 22 // // Code here runs in a child process. |
| 23 // return 0; |
| 24 // } |
| 25 // |
| 26 // The prototype of a_test_func is implicitly |
| 27 // int test_main_func_name(); |
| 28 |
| 29 namespace multi_process_function_list { |
| 30 |
| 31 // Type for child process main functions. |
| 32 typedef int (*TestMainFunctionPtr)(); |
| 33 |
| 34 // Type for child setup functions. |
| 35 typedef void (*SetupFunctionPtr)(); |
| 36 |
| 37 // Helper class to append a test function to the global mapping. |
| 38 // Used by the MULTIPROCESS_TEST_MAIN macro. |
| 39 class AppendMultiProcessTest { |
| 40 public: |
| 41 // |main_func_ptr| is the main function that is run in the child process. |
| 42 // |setup_func_ptr| is a function run when the global mapping is added. |
| 43 AppendMultiProcessTest(std::string test_name, |
| 44 TestMainFunctionPtr main_func_ptr, |
| 45 SetupFunctionPtr setup_func_ptr); |
| 46 }; |
| 47 |
| 48 // Invoke the main function of a test previously registered with |
| 49 // MULTIPROCESS_TEST_MAIN() |
| 50 int InvokeChildProcessTest(std::string test_name); |
| 51 |
| 52 // This macro creates a global MultiProcessTest::AppendMultiProcessTest object |
| 53 // whose constructor does the work of adding the global mapping. |
| 54 #define MULTIPROCESS_TEST_MAIN(test_main) \ |
| 55 MULTIPROCESS_TEST_MAIN_WITH_SETUP(test_main, NULL) |
| 56 |
| 57 // Same as above but lets callers specify a setup method that is run in the |
| 58 // child process, just before the main function is run. This facilitates |
| 59 // adding a generic one-time setup function for multiple tests. |
| 60 #define MULTIPROCESS_TEST_MAIN_WITH_SETUP(test_main, test_setup) \ |
| 61 int test_main(); \ |
| 62 namespace { \ |
| 63 multi_process_function_list::AppendMultiProcessTest \ |
| 64 AddMultiProcessTest##_##test_main(#test_main, \ |
| 65 (test_main), \ |
| 66 (test_setup)); \ |
| 67 } \ |
| 68 int test_main() |
| 69 |
| 70 } // namespace multi_process_function_list |
| 71 |
| 72 #endif // TESTING_MULTIPROCESS_FUNC_LIST_H_ |
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