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 "android-base/unique_fd.h" 21 #include "base/mutex.h" 22 23 namespace art { 24 25 class Runtime; 26 class SignalSet; 27 class Thread; 28 29 /* 30 * A daemon thread that catches signals and does something useful. For 31 * example, when a SIGQUIT (Ctrl-\) arrives, we suspend and dump the 32 * status of all threads. 33 */ 34 class SignalCatcher { 35 public: 36 SignalCatcher(); 37 ~SignalCatcher(); 38 39 void HandleSigQuit() REQUIRES(!Locks::mutator_lock_, !Locks::thread_list_lock_, 40 !Locks::thread_suspend_count_lock_); 41 42 43 private: 44 // NO_THREAD_SAFETY_ANALYSIS for static function calling into member function with excludes lock. 45 static void* Run(void* arg) NO_THREAD_SAFETY_ANALYSIS; 46 47 void HandleSigUsr1(); 48 void Output(const std::string& s); 49 void SetHaltFlag(bool new_value) REQUIRES(!lock_); 50 bool ShouldHalt() REQUIRES(!lock_); 51 int WaitForSignal(Thread* self, SignalSet& signals) REQUIRES(!lock_); 52 53 mutable Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; 54 ConditionVariable cond_ GUARDED_BY(lock_); 55 bool halt_ GUARDED_BY(lock_); 56 pthread_t pthread_ GUARDED_BY(lock_); 57 Thread* thread_ GUARDED_BY(lock_); 58 }; 59 60 } // namespace art 61 62 #endif // ART_RUNTIME_SIGNAL_CATCHER_H_ 63