| /****************************************************************************** |
| * |
| * Copyright (C) 2015 Google, Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| ******************************************************************************/ |
| |
| #pragma once |
| |
| #include <stdint.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| typedef uint64_t period_ms_t; |
| |
| // Get the OS boot time in milliseconds. |
| // |
| // NOTE: The return value will rollover every 49.7 days, |
| // hence it cannot be used for absolute time comparison. |
| // Relative time comparison using 32-bits integers such |
| // as (t2_u32 - t1_u32 < delta_u32) should work as expected as long |
| // as there is no multiple rollover between t2_u32 and t1_u32. |
| // |
| // TODO: This function's return type should be modified to |period_ms_t|. |
| // Be careful: some of the code that is using it assumes the return type |
| // is uint32_t. |
| uint32_t time_get_os_boottime_ms(void); |
| |
| // Get the OS boot time in microseconds. |
| uint64_t time_get_os_boottime_us(void); |
| |
| #ifdef __cplusplus |
| } |
| #endif |