1 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved. 2 * Use of this source code is governed by a BSD-style license that can be 3 * found in the LICENSE file. 4 */ 5 6 #include "timer_utils.h" 7 8 void StartTimer(ClockTimerState* ct) { 9 clock_gettime(CLOCK_REALTIME, &ct->start_time); 10 } 11 12 void StopTimer(ClockTimerState* ct) { 13 clock_gettime(CLOCK_REALTIME, &ct->end_time); 14 } 15 16 uint32_t GetDurationMsecs(ClockTimerState* ct) { 17 uint64_t start = ((uint64_t) ct->start_time.tv_sec * 1000000000 + 18 (uint64_t) ct->start_time.tv_nsec); 19 uint64_t end = ((uint64_t) ct->end_time.tv_sec * 1000000000 + 20 (uint64_t) ct->end_time.tv_nsec); 21 uint64_t duration_msecs = (end - start) / 1000000U; /* Nanoseconds -> 22 * Milliseconds. */ 23 return (uint32_t) duration_msecs; 24 } 25
