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      1 /*
      2  * Copyright (C) 2012 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 /*
     18  *  Asynchronous interval timer.
     19  */
     20 
     21 #include "IntervalTimer.h"
     22 #include "OverrideLog.h"
     23 
     24 
     25 IntervalTimer::IntervalTimer()
     26 {
     27     mTimerId = 0;
     28     mCb = NULL;
     29 }
     30 
     31 
     32 bool IntervalTimer::set(int ms, TIMER_FUNC cb)
     33 {
     34     if (mTimerId == 0)
     35     {
     36         if (cb == NULL)
     37             return false;
     38 
     39         if (!create(cb))
     40             return false;
     41     }
     42     if (cb != mCb)
     43     {
     44         kill();
     45         if (!create(cb))
     46             return false;
     47     }
     48 
     49     int stat = 0;
     50     struct itimerspec ts;
     51     ts.it_value.tv_sec = ms / 1000;
     52     ts.it_value.tv_nsec = (ms % 1000) * 1000000;
     53 
     54     ts.it_interval.tv_sec = 0;
     55     ts.it_interval.tv_nsec = 0;
     56 
     57     stat = timer_settime(mTimerId, 0, &ts, 0);
     58     if (stat == -1)
     59         ALOGE("IntervalTimer::set: fail set timer");
     60     return stat == 0;
     61 }
     62 
     63 
     64 IntervalTimer::~IntervalTimer()
     65 {
     66     kill();
     67 }
     68 
     69 
     70 void IntervalTimer::kill()
     71 {
     72     if (mTimerId == 0)
     73         return;
     74 
     75     timer_delete(mTimerId);
     76     mTimerId = 0;
     77     mCb = NULL;
     78 }
     79 
     80 
     81 bool IntervalTimer::create(TIMER_FUNC cb)
     82 {
     83     struct sigevent se;
     84     int stat = 0;
     85 
     86     /*
     87      * Set the sigevent structure to cause the signal to be
     88      * delivered by creating a new thread.
     89      */
     90     se.sigev_notify = SIGEV_THREAD;
     91     se.sigev_value.sival_ptr = &mTimerId;
     92     se.sigev_notify_function = cb;
     93     se.sigev_notify_attributes = NULL;
     94     mCb = cb;
     95     stat = timer_create(CLOCK_MONOTONIC, &se, &mTimerId);
     96     if (stat == -1)
     97         ALOGE("IntervalTimer::create: fail create timer");
     98     return stat == 0;
     99 }
    100