1 /* 2 * Copyright (C) 2012 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_SET_H_ 18 #define ART_RUNTIME_SIGNAL_SET_H_ 19 20 #include <signal.h> 21 22 #include "base/logging.h" 23 24 namespace art { 25 26 class SignalSet { 27 public: SignalSet()28 SignalSet() { 29 if (sigemptyset(&set_) == -1) { 30 PLOG(FATAL) << "sigemptyset failed"; 31 } 32 } 33 Add(int signal)34 void Add(int signal) { 35 if (sigaddset(&set_, signal) == -1) { 36 PLOG(FATAL) << "sigaddset " << signal << " failed"; 37 } 38 } 39 Block()40 void Block() { 41 if (sigprocmask(SIG_BLOCK, &set_, nullptr) == -1) { 42 PLOG(FATAL) << "sigprocmask failed"; 43 } 44 } 45 Wait()46 int Wait() { 47 // Sleep in sigwait() until a signal arrives. gdb causes EINTR failures. 48 int signal_number; 49 int rc = TEMP_FAILURE_RETRY(sigwait(&set_, &signal_number)); 50 if (rc != 0) { 51 PLOG(FATAL) << "sigwait failed"; 52 } 53 return signal_number; 54 } 55 56 private: 57 sigset_t set_; 58 }; 59 60 } // namespace art 61 62 #endif // ART_RUNTIME_SIGNAL_SET_H_ 63