1 /****************************************************************************** 2 * 3 * Copyright (C) 2015 Google, Inc. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ******************************************************************************/ 18 19 #pragma once 20 21 #include <stdint.h> 22 23 // Get the OS boot time in milliseconds. 24 // 25 // NOTE: The return value will rollover every 49.7 days, 26 // hence it cannot be used for absolute time comparison. 27 // Relative time comparison using 32-bits integers such 28 // as (t2_u32 - t1_u32 < delta_u32) should work as expected as long 29 // as there is no multiple rollover between t2_u32 and t1_u32. 30 uint32_t time_get_os_boottime_ms(void); 31