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      1 /*
      2  * Copyright (C) 2012-2013 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 _LOGD_LOG_TIMES_H__
     18 #define _LOGD_LOG_TIMES_H__
     19 
     20 #include <pthread.h>
     21 #include <time.h>
     22 #include <sys/types.h>
     23 #include <sysutils/SocketClient.h>
     24 #include <utils/List.h>
     25 
     26 class LogReader;
     27 
     28 class LogTimeEntry {
     29     static pthread_mutex_t timesLock;
     30     unsigned int mRefCount;
     31     bool mRelease;
     32     bool mError;
     33     bool threadRunning;
     34     pthread_cond_t threadTriggeredCondition;
     35     pthread_t mThread;
     36     LogReader &mReader;
     37     static void *threadStart(void *me);
     38     static void threadStop(void *me);
     39     const unsigned int mLogMask;
     40     const pid_t mPid;
     41     unsigned int skipAhead;
     42     unsigned long mCount;
     43     unsigned long mTail;
     44     unsigned long mIndex;
     45 
     46 public:
     47     LogTimeEntry(LogReader &reader, SocketClient *client, bool nonBlock,
     48                  unsigned long tail, unsigned int logMask, pid_t pid,
     49                  log_time start);
     50 
     51     SocketClient *mClient;
     52     static const struct timespec EPOCH;
     53     log_time mStart;
     54     const bool mNonBlock;
     55     const log_time mEnd; // only relevant if mNonBlock
     56 
     57     // Protect List manipulations
     58     static void lock(void) { pthread_mutex_lock(&timesLock); }
     59     static void unlock(void) { pthread_mutex_unlock(&timesLock); }
     60 
     61     void startReader_Locked(void);
     62 
     63     bool runningReader_Locked(void) const {
     64         return threadRunning || mRelease || mError || mNonBlock;
     65     }
     66     void triggerReader_Locked(void) {
     67         pthread_cond_signal(&threadTriggeredCondition);
     68     }
     69 
     70     void triggerSkip_Locked(unsigned int skip) { skipAhead = skip; }
     71 
     72     // Called after LogTimeEntry removed from list, lock implicitly held
     73     void release_Locked(void) {
     74         mRelease = true;
     75         pthread_cond_signal(&threadTriggeredCondition);
     76         if (mRefCount || threadRunning) {
     77             return;
     78         }
     79         // No one else is holding a reference to this
     80         delete this;
     81     }
     82 
     83     // Called to mark socket in jeopardy
     84     void error_Locked(void) { mError = true; }
     85     void error(void) { lock(); error_Locked(); unlock(); }
     86 
     87     bool isError_Locked(void) const { return mRelease || mError; }
     88 
     89     // Mark Used
     90     //  Locking implied, grabbed when protection around loop iteration
     91     void incRef_Locked(void) { ++mRefCount; }
     92 
     93     bool owned_Locked(void) const { return mRefCount != 0; }
     94 
     95     void decRef_Locked(void) {
     96         if ((mRefCount && --mRefCount) || !mRelease || threadRunning) {
     97             return;
     98         }
     99         // No one else is holding a reference to this
    100         delete this;
    101     }
    102 
    103     // flushTo filter callbacks
    104     static bool FilterFirstPass(const LogBufferElement *element, void *me);
    105     static bool FilterSecondPass(const LogBufferElement *element, void *me);
    106 };
    107 
    108 typedef android::List<LogTimeEntry *> LastLogTimes;
    109 
    110 #endif
    111