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 <sys/time.h> 24 #include <time.h> 25 26 #if defined(HAVE_ANDROID_OS) 27 nsecs_t systemTime(int clock) 28 { 29 static const clockid_t clocks[] = { 30 CLOCK_REALTIME, 31 CLOCK_MONOTONIC, 32 CLOCK_PROCESS_CPUTIME_ID, 33 CLOCK_THREAD_CPUTIME_ID, 34 CLOCK_BOOTTIME 35 }; 36 struct timespec t; 37 t.tv_sec = t.tv_nsec = 0; 38 clock_gettime(clocks[clock], &t); 39 return nsecs_t(t.tv_sec)*1000000000LL + t.tv_nsec; 40 } 41 #else 42 nsecs_t systemTime(int /*clock*/) 43 { 44 // Clock support varies widely across hosts. Mac OS doesn't support 45 // posix clocks, older glibcs don't support CLOCK_BOOTTIME and Windows 46 // is windows. 47 struct timeval t; 48 t.tv_sec = t.tv_usec = 0; 49 gettimeofday(&t, NULL); 50 return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL; 51 } 52 #endif 53 54 int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime) 55 { 56 int timeoutDelayMillis; 57 if (timeoutTime > referenceTime) { 58 uint64_t timeoutDelay = uint64_t(timeoutTime - referenceTime); 59 if (timeoutDelay > uint64_t((INT_MAX - 1) * 1000000LL)) { 60 timeoutDelayMillis = -1; 61 } else { 62 timeoutDelayMillis = (timeoutDelay + 999999LL) / 1000000LL; 63 } 64 } else { 65 timeoutDelayMillis = 0; 66 } 67 return timeoutDelayMillis; 68 } 69
