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
25IntervalTimer::IntervalTimer()
26{
27    mTimerId = 0;
28    mCb = NULL;
29}
30
31
32bool 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
64IntervalTimer::~IntervalTimer()
65{
66    kill();
67}
68
69
70void IntervalTimer::kill()
71{
72    if (mTimerId == 0)
73        return;
74
75    timer_delete(mTimerId);
76    mTimerId = 0;
77    mCb = NULL;
78}
79
80
81bool 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