1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_RUNTIME_SIGNAL_CATCHER_H_ 18 #define ART_RUNTIME_SIGNAL_CATCHER_H_ 19 20 #include "base/mutex.h" 21 22 namespace art { 23 24 class Runtime; 25 class SignalSet; 26 class Thread; 27 28 /* 29 * A daemon thread that catches signals and does something useful. For 30 * example, when a SIGQUIT (Ctrl-\) arrives, we suspend and dump the 31 * status of all threads. 32 */ 33 class SignalCatcher { 34 public: 35 explicit SignalCatcher(const std::string& stack_trace_file); 36 ~SignalCatcher(); 37 38 void HandleSigQuit() LOCKS_EXCLUDED(Locks::mutator_lock_, 39 Locks::thread_list_lock_, 40 Locks::thread_suspend_count_lock_); 41 42 43 private: 44 static void* Run(void* arg); 45 46 void HandleSigUsr1(); 47 void Output(const std::string& s); 48 void SetHaltFlag(bool new_value); 49 bool ShouldHalt(); 50 int WaitForSignal(Thread* self, SignalSet& signals); 51 52 std::string stack_trace_file_; 53 54 mutable Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; 55 ConditionVariable cond_ GUARDED_BY(lock_); 56 bool halt_ GUARDED_BY(lock_); 57 pthread_t pthread_ GUARDED_BY(lock_); 58 Thread* thread_ GUARDED_BY(lock_); 59 }; 60 61 } // namespace art 62 63 #endif // ART_RUNTIME_SIGNAL_CATCHER_H_ 64
