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 23 #include <android-base/stringprintf.h> 24 #include <base/logging.h> 25 26 using android::base::StringPrintf; 27 28 IntervalTimer::IntervalTimer() { 29 mTimerId = 0; 30 mCb = NULL; 31 } 32 33 bool IntervalTimer::set(int ms, TIMER_FUNC cb) { 34 if (mTimerId == 0) { 35 if (cb == NULL) return false; 36 37 if (!create(cb)) return false; 38 } 39 if (cb != mCb) { 40 kill(); 41 if (!create(cb)) return false; 42 } 43 44 int stat = 0; 45 struct itimerspec ts; 46 ts.it_value.tv_sec = ms / 1000; 47 ts.it_value.tv_nsec = (ms % 1000) * 1000000; 48 49 ts.it_interval.tv_sec = 0; 50 ts.it_interval.tv_nsec = 0; 51 52 stat = timer_settime(mTimerId, 0, &ts, 0); 53 if (stat == -1) LOG(ERROR) << StringPrintf("fail set timer"); 54 return stat == 0; 55 } 56 57 IntervalTimer::~IntervalTimer() { kill(); } 58 59 void IntervalTimer::kill() { 60 if (mTimerId == 0) return; 61 62 timer_delete(mTimerId); 63 mTimerId = 0; 64 mCb = NULL; 65 } 66 67 bool IntervalTimer::create(TIMER_FUNC cb) { 68 struct sigevent se; 69 int stat = 0; 70 71 /* 72 * Set the sigevent structure to cause the signal to be 73 * delivered by creating a new thread. 74 */ 75 se.sigev_notify = SIGEV_THREAD; 76 se.sigev_value.sival_ptr = &mTimerId; 77 se.sigev_notify_function = cb; 78 se.sigev_notify_attributes = NULL; 79 mCb = cb; 80 stat = timer_create(CLOCK_MONOTONIC, &se, &mTimerId); 81 if (stat == -1) LOG(ERROR) << StringPrintf("fail create timer"); 82 return stat == 0; 83 } 84
