Home | History | Annotate | Download | only in logd
      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 
     24 #include <list>
     25 
     26 #include <sysutils/SocketClient.h>
     27 #include <log/log.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     unsigned long mCount;
     48     unsigned long mTail;
     49     unsigned long mIndex;
     50 
     51 public:
     52     LogTimeEntry(LogReader &reader, SocketClient *client, bool nonBlock,
     53                  unsigned long tail, unsigned int logMask, pid_t pid,
     54                  uint64_t start, uint64_t timeout);
     55 
     56     SocketClient *mClient;
     57     uint64_t mStart;
     58     struct timespec mTimeout;
     59     const bool mNonBlock;
     60     const uint64_t mEnd; // only relevant if mNonBlock
     61 
     62     // Protect List manipulations
     63     static void lock(void) { pthread_mutex_lock(&timesLock); }
     64     static void unlock(void) { pthread_mutex_unlock(&timesLock); }
     65 
     66     void startReader_Locked(void);
     67 
     68     bool runningReader_Locked(void) const {
     69         return threadRunning || mRelease || mError || mNonBlock;
     70     }
     71     void triggerReader_Locked(void) {
     72         pthread_cond_signal(&threadTriggeredCondition);
     73     }
     74 
     75     void triggerSkip_Locked(log_id_t id, unsigned int skip) { skipAhead[id] = skip; }
     76     void cleanSkip_Locked(void);
     77 
     78     // These called after LogTimeEntry removed from list, lock implicitly held
     79     void release_nodelete_Locked(void) {
     80         mRelease = true;
     81         pthread_cond_signal(&threadTriggeredCondition);
     82         // assumes caller code path will call decRef_Locked()
     83     }
     84 
     85     void release_Locked(void) {
     86         mRelease = true;
     87         pthread_cond_signal(&threadTriggeredCondition);
     88         if (mRefCount || threadRunning) {
     89             return;
     90         }
     91         // No one else is holding a reference to this
     92         delete this;
     93     }
     94 
     95     // Called to mark socket in jeopardy
     96     void error_Locked(void) { mError = true; }
     97     void error(void) { lock(); error_Locked(); unlock(); }
     98 
     99     bool isError_Locked(void) const { return mRelease || mError; }
    100 
    101     // Mark Used
    102     //  Locking implied, grabbed when protection around loop iteration
    103     void incRef_Locked(void) { ++mRefCount; }
    104 
    105     bool owned_Locked(void) const { return mRefCount != 0; }
    106 
    107     void decRef_Locked(void) {
    108         if ((mRefCount && --mRefCount) || !mRelease || threadRunning) {
    109             return;
    110         }
    111         // No one else is holding a reference to this
    112         delete this;
    113     }
    114     bool isWatching(log_id_t id) { return (mLogMask & (1<<id)) != 0; }
    115     // flushTo filter callbacks
    116     static int FilterFirstPass(const LogBufferElement *element, void *me);
    117     static int FilterSecondPass(const LogBufferElement *element, void *me);
    118 };
    119 
    120 typedef std::list<LogTimeEntry *> LastLogTimes;
    121 
    122 #endif // _LOGD_LOG_TIMES_H__
    123