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      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 
     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 
     44   inline void Unlock() {
     45     pthread_mutex_unlock(&mutex_);
     46   }
     47 
     48   inline ucontext_t* GetUcontext() { return &ucontext_; }
     49 
     50 private:
     51   ThreadEntry(pid_t pid, pid_t tid);
     52   ~ThreadEntry();
     53 
     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