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 #ifndef _LIBBACKTRACE_THREAD_ENTRY_H 18 #define _LIBBACKTRACE_THREAD_ENTRY_H 19 20 #include <pthread.h> 21 #include <sys/types.h> 22 #include <ucontext.h> 23 24 class ThreadEntry { 25 public: 26 static ThreadEntry* Get(pid_t pid, pid_t tid, bool create = true); 27 28 static void Remove(ThreadEntry* entry); 29 30 void Wake(); 31 32 bool Wait(int); 33 34 void CopyUcontextFromSigcontext(void*); 35 Lock()36 inline void Lock() { 37 pthread_mutex_lock(&mutex_); 38 39 // Always reset the wait value since this could be the first or nth 40 // time this entry is locked. 41 wait_value_ = 0; 42 } 43 Unlock()44 inline void Unlock() { 45 pthread_mutex_unlock(&mutex_); 46 } 47 GetUcontext()48 inline ucontext_t* GetUcontext() { return &ucontext_; } 49 50 private: 51 ThreadEntry(pid_t pid, pid_t tid); 52 ~ThreadEntry(); 53 Match(pid_t chk_pid,pid_t chk_tid)54 bool Match(pid_t chk_pid, pid_t chk_tid) { return (chk_pid == pid_ && chk_tid == tid_); } 55 56 pid_t pid_; 57 pid_t tid_; 58 int ref_count_; 59 pthread_mutex_t mutex_; 60 pthread_mutex_t wait_mutex_; 61 pthread_cond_t wait_cond_; 62 int wait_value_; 63 ThreadEntry* next_; 64 ThreadEntry* prev_; 65 ucontext_t ucontext_; 66 67 static ThreadEntry* list_; 68 static pthread_mutex_t list_mutex_; 69 }; 70 71 #endif // _LIBBACKTRACE_THREAD_ENTRY_H 72