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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 <sys/types.h>
     22 #include <time.h>
     23 
     24 #include <list>
     25 
     26 #include <log/log.h>
     27 #include <sysutils/SocketClient.h>
     28 
     29 class LogReader;
     30 class LogBufferElement;
     31 
     32 class LogTimeEntry {
     33     static pthread_mutex_t timesLock;
     34     unsigned int mRefCount;
     35     bool mRelease;
     36     bool mError;
     37     bool threadRunning;
     38     bool leadingDropped;
     39     pthread_cond_t threadTriggeredCondition;
     40     pthread_t mThread;
     41     LogReader& mReader;
     42     static void* threadStart(void* me);
     43     static void threadStop(void* me);
     44     const unsigned int mLogMask;
     45     const pid_t mPid;
     46     unsigned int skipAhead[LOG_ID_MAX];
     47     pid_t mLastTid[LOG_ID_MAX];
     48     unsigned long mCount;
     49     unsigned long mTail;
     50     unsigned long mIndex;
     51 
     52    public:
     53     LogTimeEntry(LogReader& reader, SocketClient* client, bool nonBlock,
     54                  unsigned long tail, unsigned int logMask, pid_t pid,
     55                  log_time start, uint64_t timeout);
     56 
     57     SocketClient* mClient;
     58     log_time mStart;
     59     struct timespec mTimeout;
     60     const bool mNonBlock;
     61     const log_time mEnd;  // only relevant if mNonBlock
     62 
     63     // Protect List manipulations
     64     static void lock(void) {
     65         pthread_mutex_lock(&timesLock);
     66     }
     67     static void unlock(void) {
     68         pthread_mutex_unlock(&timesLock);
     69     }
     70 
     71     void startReader_Locked(void);
     72 
     73     bool runningReader_Locked(void) const {
     74         return threadRunning || mRelease || mError || mNonBlock;
     75     }
     76     void triggerReader_Locked(void) {
     77         pthread_cond_signal(&threadTriggeredCondition);
     78     }
     79 
     80     void triggerSkip_Locked(log_id_t id, unsigned int skip) {
     81         skipAhead[id] = skip;
     82     }
     83     void cleanSkip_Locked(void);
     84 
     85     // These called after LogTimeEntry removed from list, lock implicitly held
     86     void release_nodelete_Locked(void) {
     87         mRelease = true;
     88         pthread_cond_signal(&threadTriggeredCondition);
     89         // assumes caller code path will call decRef_Locked()
     90     }
     91 
     92     void release_Locked(void) {
     93         mRelease = true;
     94         pthread_cond_signal(&threadTriggeredCondition);
     95         if (mRefCount || threadRunning) {
     96             return;
     97         }
     98         // No one else is holding a reference to this
     99         delete this;
    100     }
    101 
    102     // Called to mark socket in jeopardy
    103     void error_Locked(void) {
    104         mError = true;
    105     }
    106     void error(void) {
    107         lock();
    108         error_Locked();
    109         unlock();
    110     }
    111 
    112     bool isError_Locked(void) const {
    113         return mRelease || mError;
    114     }
    115 
    116     // Mark Used
    117     //  Locking implied, grabbed when protection around loop iteration
    118     void incRef_Locked(void) {
    119         ++mRefCount;
    120     }
    121 
    122     bool owned_Locked(void) const {
    123         return mRefCount != 0;
    124     }
    125 
    126     void decRef_Locked(void) {
    127         if ((mRefCount && --mRefCount) || !mRelease || threadRunning) {
    128             return;
    129         }
    130         // No one else is holding a reference to this
    131         delete this;
    132     }
    133     bool isWatching(log_id_t id) {
    134         return (mLogMask & (1 << id)) != 0;
    135     }
    136     // flushTo filter callbacks
    137     static int FilterFirstPass(const LogBufferElement* element, void* me);
    138     static int FilterSecondPass(const LogBufferElement* element, void* me);
    139 };
    140 
    141 typedef std::list<LogTimeEntry*> LastLogTimes;
    142 
    143 #endif  // _LOGD_LOG_TIMES_H__
    144