1 | // Licensed to the Apache Software Foundation (ASF) under one |
2 | // or more contributor license agreements. See the NOTICE file |
3 | // distributed with this work for additional information |
4 | // regarding copyright ownership. The ASF licenses this file |
5 | // to you under the Apache License, Version 2.0 (the |
6 | // "License"); you may not use this file except in compliance |
7 | // with the License. You may obtain a copy of the License at |
8 | // |
9 | // http://www.apache.org/licenses/LICENSE-2.0 |
10 | // |
11 | // Unless required by applicable law or agreed to in writing, |
12 | // software distributed under the License is distributed on an |
13 | // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
14 | // KIND, either express or implied. See the License for the |
15 | // specific language governing permissions and limitations |
16 | // under the License. |
17 | |
18 | |
19 | #ifndef BRPC_PROFILER_LINKER_H |
20 | #define BRPC_PROFILER_LINKER_H |
21 | |
22 | #if defined(BRPC_ENABLE_CPU_PROFILER) || defined(BAIDU_RPC_ENABLE_CPU_PROFILER) |
23 | #include "butil/gperftools_profiler.h" |
24 | #endif |
25 | |
26 | namespace brpc { |
27 | |
28 | // defined in src/brpc/builtin/index_service.cpp |
29 | extern bool cpu_profiler_enabled; |
30 | |
31 | // defined in src/brpc/controller.cpp |
32 | extern int PROFILER_LINKER_DUMMY; |
33 | |
34 | struct ProfilerLinker { |
35 | // [ Must be inlined ] |
36 | // This function is included by user's compilation unit to force |
37 | // linking of ProfilerStart()/ProfilerStop() |
38 | // etc when corresponding macros are defined. |
39 | inline ProfilerLinker() { |
40 | |
41 | #if defined(BRPC_ENABLE_CPU_PROFILER) || defined(BAIDU_RPC_ENABLE_CPU_PROFILER) |
42 | cpu_profiler_enabled = true; |
43 | // compiler has no way to tell if PROFILER_LINKER_DUMMY is 0 or not, |
44 | // so it has to link the function inside the branch. |
45 | if (PROFILER_LINKER_DUMMY != 0/*must be false*/) { |
46 | ProfilerStart("this_function_should_never_run" ); |
47 | } |
48 | #endif |
49 | } |
50 | }; |
51 | |
52 | } // namespace brpc |
53 | |
54 | |
55 | #endif // BRPC_PROFILER_LINKER_H |
56 | |