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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 wrlock(void) {
     65         pthread_mutex_lock(&timesLock);
     66     }
     67     static void rdlock(void) {
     68         pthread_mutex_lock(&timesLock);
     69     }
     70     static void unlock(void) {
     71         pthread_mutex_unlock(&timesLock);
     72     }
     73 
     74     void startReader_Locked(void);
     75 
     76     bool runningReader_Locked(void) const {
     77         return threadRunning || mRelease || mError || mNonBlock;
     78     }
     79     void triggerReader_Locked(void) {
     80         pthread_cond_signal(&threadTriggeredCondition);
     81     }
     82 
     83     void triggerSkip_Locked(log_id_t id, unsigned int skip) {
     84         skipAhead[id] = skip;
     85     }
     86     void cleanSkip_Locked(void);
     87 
     88     // These called after LogTimeEntry removed from list, lock implicitly held
     89     void release_nodelete_Locked(void) {
     90         mRelease = true;
     91         pthread_cond_signal(&threadTriggeredCondition);
     92         // assumes caller code path will call decRef_Locked()
     93     }
     94 
     95     void release_Locked(void) {
     96         mRelease = true;
     97         pthread_cond_signal(&threadTriggeredCondition);
     98         if (mRefCount || threadRunning) {
     99             return;
    100         }
    101         // No one else is holding a reference to this
    102         delete this;
    103     }
    104 
    105     // Called to mark socket in jeopardy
    106     void error_Locked(void) {
    107         mError = true;
    108     }
    109     void error(void) {
    110         wrlock();
    111         error_Locked();
    112         unlock();
    113     }
    114 
    115     bool isError_Locked(void) const {
    116         return mRelease || mError;
    117     }
    118 
    119     // Mark Used
    120     //  Locking implied, grabbed when protection around loop iteration
    121     void incRef_Locked(void) {
    122         ++mRefCount;
    123     }
    124 
    125     bool owned_Locked(void) const {
    126         return mRefCount != 0;
    127     }
    128 
    129     void decRef_Locked(void) {
    130         if ((mRefCount && --mRefCount) || !mRelease || threadRunning) {
    131             return;
    132         }
    133         // No one else is holding a reference to this
    134         delete this;
    135     }
    136     bool isWatching(log_id_t id) {
    137         return (mLogMask & (1 << id)) != 0;
    138     }
    139     // flushTo filter callbacks
    140     static int FilterFirstPass(const LogBufferElement* element, void* me);
    141     static int FilterSecondPass(const LogBufferElement* element, void* me);
    142 };
    143 
    144 typedef std::list<LogTimeEntry*> LastLogTimes;
    145 
    146 #endif  // _LOGD_LOG_TIMES_H__
    147