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
IntervalTimer()25 IntervalTimer::IntervalTimer()
26 {
27 mTimerId = 0;
28 mCb = NULL;
29 }
30
31
set(int ms,TIMER_FUNC cb)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
~IntervalTimer()64 IntervalTimer::~IntervalTimer()
65 {
66 kill();
67 }
68
69
kill()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
create(TIMER_FUNC cb)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