1 /* 2 * Copyright (C) 2005 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 // Timer functions. 19 // 20 #include <utils/Timers.h> 21 22 #include <limits.h> 23 #include <stdlib.h> 24 #include <time.h> 25 26 #include <android-base/macros.h> 27 28 static constexpr size_t clock_id_max = 5; 29 30 static void checkClockId(int clock) { 31 if (clock < 0 || clock >= clock_id_max) abort(); 32 } 33 34 #if defined(__linux__) 35 nsecs_t systemTime(int clock) { 36 checkClockId(clock); 37 static constexpr clockid_t clocks[] = {CLOCK_REALTIME, CLOCK_MONOTONIC, 38 CLOCK_PROCESS_CPUTIME_ID, CLOCK_THREAD_CPUTIME_ID, 39 CLOCK_BOOTTIME}; 40 static_assert(clock_id_max == arraysize(clocks)); 41 timespec t = {}; 42 clock_gettime(clocks[clock], &t); 43 return nsecs_t(t.tv_sec)*1000000000LL + t.tv_nsec; 44 } 45 #else 46 nsecs_t systemTime(int clock) { 47 // TODO: is this ever called with anything but REALTIME on mac/windows? 48 checkClockId(clock); 49 50 // Clock support varies widely across hosts. Mac OS doesn't support 51 // CLOCK_BOOTTIME (and doesn't even have clock_gettime until 10.12). 52 // Windows is windows. 53 timeval t = {}; 54 gettimeofday(&t, nullptr); 55 return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL; 56 } 57 #endif 58 59 int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime) 60 { 61 nsecs_t timeoutDelayMillis; 62 if (timeoutTime > referenceTime) { 63 uint64_t timeoutDelay = uint64_t(timeoutTime - referenceTime); 64 if (timeoutDelay > uint64_t((INT_MAX - 1) * 1000000LL)) { 65 timeoutDelayMillis = -1; 66 } else { 67 timeoutDelayMillis = (timeoutDelay + 999999LL) / 1000000LL; 68 } 69 } else { 70 timeoutDelayMillis = 0; 71 } 72 return (int)timeoutDelayMillis; 73 } 74