1 /* 2 * Copyright (C) 2013 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 #pragma once 18 19 #include <pthread.h> 20 #include <sys/types.h> 21 #include <ucontext.h> 22 23 #include <condition_variable> 24 #include <map> 25 #include <mutex> 26 27 namespace unwindstack { 28 29 enum WaitType : int { 30 WAIT_FOR_UCONTEXT = 1, 31 WAIT_FOR_UNWIND_TO_COMPLETE, 32 WAIT_FOR_THREAD_TO_RESTART, 33 }; 34 35 class ThreadEntry { 36 public: 37 static ThreadEntry* Get(pid_t tid, bool create = true); 38 39 static void Remove(ThreadEntry* entry); 40 41 void Wake(); 42 43 bool Wait(WaitType type); 44 45 void CopyUcontextFromSigcontext(void* sigcontext); 46 Lock()47 inline void Lock() { 48 mutex_.lock(); 49 50 // Always reset the wait value since this could be the first or nth 51 // time this entry is locked. 52 wait_value_ = 0; 53 } 54 Unlock()55 inline void Unlock() { mutex_.unlock(); } 56 GetUcontext()57 inline ucontext_t* GetUcontext() { return &ucontext_; } 58 59 private: 60 ThreadEntry(pid_t tid); 61 ~ThreadEntry(); 62 63 pid_t tid_; 64 int ref_count_; 65 std::mutex mutex_; 66 std::mutex wait_mutex_; 67 std::condition_variable wait_cond_; 68 int wait_value_; 69 ucontext_t ucontext_; 70 71 static std::mutex entries_mutex_; 72 static std::map<pid_t, ThreadEntry*> entries_; 73 74 static const char* GetWaitTypeName(WaitType type); 75 }; 76 77 } // namespace unwindstack 78