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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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