1*eb293b8fSAndroid Build Coastguard Worker /* 2*eb293b8fSAndroid Build Coastguard Worker * Copyright (C) 2013 The Android Open Source Project 3*eb293b8fSAndroid Build Coastguard Worker * 4*eb293b8fSAndroid Build Coastguard Worker * Licensed under the Apache License, Version 2.0 (the "License"); 5*eb293b8fSAndroid Build Coastguard Worker * you may not use this file except in compliance with the License. 6*eb293b8fSAndroid Build Coastguard Worker * You may obtain a copy of the License at 7*eb293b8fSAndroid Build Coastguard Worker * 8*eb293b8fSAndroid Build Coastguard Worker * http://www.apache.org/licenses/LICENSE-2.0 9*eb293b8fSAndroid Build Coastguard Worker * 10*eb293b8fSAndroid Build Coastguard Worker * Unless required by applicable law or agreed to in writing, software 11*eb293b8fSAndroid Build Coastguard Worker * distributed under the License is distributed on an "AS IS" BASIS, 12*eb293b8fSAndroid Build Coastguard Worker * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13*eb293b8fSAndroid Build Coastguard Worker * See the License for the specific language governing permissions and 14*eb293b8fSAndroid Build Coastguard Worker * limitations under the License. 15*eb293b8fSAndroid Build Coastguard Worker */ 16*eb293b8fSAndroid Build Coastguard Worker 17*eb293b8fSAndroid Build Coastguard Worker #pragma once 18*eb293b8fSAndroid Build Coastguard Worker 19*eb293b8fSAndroid Build Coastguard Worker #include <pthread.h> 20*eb293b8fSAndroid Build Coastguard Worker #include <sys/types.h> 21*eb293b8fSAndroid Build Coastguard Worker #include <ucontext.h> 22*eb293b8fSAndroid Build Coastguard Worker 23*eb293b8fSAndroid Build Coastguard Worker #include <condition_variable> 24*eb293b8fSAndroid Build Coastguard Worker #include <map> 25*eb293b8fSAndroid Build Coastguard Worker #include <mutex> 26*eb293b8fSAndroid Build Coastguard Worker 27*eb293b8fSAndroid Build Coastguard Worker namespace unwindstack { 28*eb293b8fSAndroid Build Coastguard Worker 29*eb293b8fSAndroid Build Coastguard Worker enum WaitType : int { 30*eb293b8fSAndroid Build Coastguard Worker WAIT_FOR_UCONTEXT = 1, 31*eb293b8fSAndroid Build Coastguard Worker WAIT_FOR_UNWIND_TO_COMPLETE, 32*eb293b8fSAndroid Build Coastguard Worker WAIT_FOR_THREAD_TO_RESTART, 33*eb293b8fSAndroid Build Coastguard Worker }; 34*eb293b8fSAndroid Build Coastguard Worker 35*eb293b8fSAndroid Build Coastguard Worker class ThreadEntry { 36*eb293b8fSAndroid Build Coastguard Worker public: 37*eb293b8fSAndroid Build Coastguard Worker static ThreadEntry* Get(pid_t tid, bool create = true); 38*eb293b8fSAndroid Build Coastguard Worker 39*eb293b8fSAndroid Build Coastguard Worker static void Remove(ThreadEntry* entry); 40*eb293b8fSAndroid Build Coastguard Worker 41*eb293b8fSAndroid Build Coastguard Worker void Wake(); 42*eb293b8fSAndroid Build Coastguard Worker 43*eb293b8fSAndroid Build Coastguard Worker bool Wait(WaitType type, pid_t tid); 44*eb293b8fSAndroid Build Coastguard Worker 45*eb293b8fSAndroid Build Coastguard Worker void CopyUcontextFromSigcontext(void* sigcontext); 46*eb293b8fSAndroid Build Coastguard Worker Lock()47*eb293b8fSAndroid Build Coastguard Worker inline void Lock() { 48*eb293b8fSAndroid Build Coastguard Worker mutex_.lock(); 49*eb293b8fSAndroid Build Coastguard Worker 50*eb293b8fSAndroid Build Coastguard Worker // Always reset the wait value since this could be the first or nth 51*eb293b8fSAndroid Build Coastguard Worker // time this entry is locked. 52*eb293b8fSAndroid Build Coastguard Worker wait_value_ = 0; 53*eb293b8fSAndroid Build Coastguard Worker } 54*eb293b8fSAndroid Build Coastguard Worker Unlock()55*eb293b8fSAndroid Build Coastguard Worker inline void Unlock() { mutex_.unlock(); } 56*eb293b8fSAndroid Build Coastguard Worker GetUcontext()57*eb293b8fSAndroid Build Coastguard Worker inline ucontext_t* GetUcontext() { return &ucontext_; } 58*eb293b8fSAndroid Build Coastguard Worker 59*eb293b8fSAndroid Build Coastguard Worker private: 60*eb293b8fSAndroid Build Coastguard Worker ThreadEntry(pid_t tid); 61*eb293b8fSAndroid Build Coastguard Worker ~ThreadEntry(); 62*eb293b8fSAndroid Build Coastguard Worker 63*eb293b8fSAndroid Build Coastguard Worker pid_t tid_; 64*eb293b8fSAndroid Build Coastguard Worker int ref_count_; 65*eb293b8fSAndroid Build Coastguard Worker std::mutex mutex_; 66*eb293b8fSAndroid Build Coastguard Worker std::mutex wait_mutex_; 67*eb293b8fSAndroid Build Coastguard Worker std::condition_variable wait_cond_; 68*eb293b8fSAndroid Build Coastguard Worker int wait_value_; 69*eb293b8fSAndroid Build Coastguard Worker ucontext_t ucontext_; 70*eb293b8fSAndroid Build Coastguard Worker 71*eb293b8fSAndroid Build Coastguard Worker static std::mutex entries_mutex_; 72*eb293b8fSAndroid Build Coastguard Worker static std::map<pid_t, ThreadEntry*> entries_; 73*eb293b8fSAndroid Build Coastguard Worker 74*eb293b8fSAndroid Build Coastguard Worker static const char* GetWaitTypeName(WaitType type); 75*eb293b8fSAndroid Build Coastguard Worker }; 76*eb293b8fSAndroid Build Coastguard Worker 77*eb293b8fSAndroid Build Coastguard Worker } // namespace unwindstack 78