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