11755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org/* 21755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 31755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org * 41755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org * Use of this source code is governed by a BSD-style license 51755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org * that can be found in the LICENSE file in the root of the source 61755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org * tree. An additional intellectual property rights grant can be found 71755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org * in the file PATENTS. All contributing project authors may 81755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org * be found in the AUTHORS file in the root of the source tree. 91755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org */ 101755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org 11c9dcfa16f1abd6d96ca348fb883886ce515865fbphoglund@webrtc.org#include "webrtc/system_wrappers/interface/tick_util.h" 121755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org 133f45c2e0ac4cb280f941efa3a3476895795e3dd6pbos@webrtc.org#include <assert.h> 141755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org 151755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.orgnamespace webrtc { 161755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org 17c9dcfa16f1abd6d96ca348fb883886ce515865fbphoglund@webrtc.orgbool TickTime::use_fake_clock_ = false; 18c0231afbbf1d7bac40b77da5933715dc63c88144pbos@webrtc.orgint64_t TickTime::fake_ticks_ = 0; 191755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org 20c0231afbbf1d7bac40b77da5933715dc63c88144pbos@webrtc.orgvoid TickTime::UseFakeClock(int64_t start_millisecond) { 21c9dcfa16f1abd6d96ca348fb883886ce515865fbphoglund@webrtc.org use_fake_clock_ = true; 22c9dcfa16f1abd6d96ca348fb883886ce515865fbphoglund@webrtc.org fake_ticks_ = MillisecondsToTicks(start_millisecond); 231755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org} 241755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org 25c0231afbbf1d7bac40b77da5933715dc63c88144pbos@webrtc.orgvoid TickTime::AdvanceFakeClock(int64_t milliseconds) { 26c9dcfa16f1abd6d96ca348fb883886ce515865fbphoglund@webrtc.org assert(use_fake_clock_); 27c9dcfa16f1abd6d96ca348fb883886ce515865fbphoglund@webrtc.org fake_ticks_ += MillisecondsToTicks(milliseconds); 281755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org} 291755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org 30d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.orgint64_t TickTime::QueryOsForTicks() { 31d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org TickTime result; 32d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#if _WIN32 33d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // TODO(wu): Remove QueryPerformanceCounter implementation. 34d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#ifdef USE_QUERY_PERFORMANCE_COUNTER 35d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // QueryPerformanceCounter returns the value from the TSC which is 36d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // incremented at the CPU frequency. The algorithm used requires 37d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // the CPU frequency to be constant. Technology like speed stepping 38d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // which has variable CPU frequency will therefore yield unpredictable, 39d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // incorrect time estimations. 40d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org LARGE_INTEGER qpcnt; 41d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org QueryPerformanceCounter(&qpcnt); 42d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org result.ticks_ = qpcnt.QuadPart; 43d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#else 44d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org static volatile LONG last_time_get_time = 0; 45d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org static volatile int64_t num_wrap_time_get_time = 0; 46d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org volatile LONG* last_time_get_time_ptr = &last_time_get_time; 47d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org DWORD now = timeGetTime(); 48d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // Atomically update the last gotten time 49d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org DWORD old = InterlockedExchange(last_time_get_time_ptr, now); 50d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org if (now < old) { 51d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // If now is earlier than old, there may have been a race between 52d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // threads. 53d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // 0x0fffffff ~3.1 days, the code will not take that long to execute 54d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // so it must have been a wrap around. 55d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org if (old > 0xf0000000 && now < 0x0fffffff) { 56d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org num_wrap_time_get_time++; 57d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org } 58d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org } 59d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org result.ticks_ = now + (num_wrap_time_get_time << 32); 60d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#endif 61d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#elif defined(WEBRTC_LINUX) 62d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org struct timespec ts; 63d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // TODO(wu): Remove CLOCK_REALTIME implementation. 64d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#ifdef WEBRTC_CLOCK_TYPE_REALTIME 65d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org clock_gettime(CLOCK_REALTIME, &ts); 66d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#else 67d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org clock_gettime(CLOCK_MONOTONIC, &ts); 68d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#endif 69d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org result.ticks_ = 1000000000LL * static_cast<int64_t>(ts.tv_sec) + 70d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org static_cast<int64_t>(ts.tv_nsec); 71d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#elif defined(WEBRTC_MAC) 72d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org static mach_timebase_info_data_t timebase; 73d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org if (timebase.denom == 0) { 74d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // Get the timebase if this is the first time we run. 75d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // Recommended by Apple's QA1398. 76d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org kern_return_t retval = mach_timebase_info(&timebase); 77d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org if (retval != KERN_SUCCESS) { 78d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // TODO(wu): Implement CHECK similar to chrome for all the platforms. 79d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // Then replace this with a CHECK(retval == KERN_SUCCESS); 80d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#ifndef WEBRTC_IOS 81d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org asm("int3"); 82d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#else 83d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org __builtin_trap(); 84d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#endif // WEBRTC_IOS 85d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org } 86d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org } 87d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org // Use timebase to convert absolute time tick units into nanoseconds. 88d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org result.ticks_ = mach_absolute_time() * timebase.numer / timebase.denom; 89d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#else 90d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org struct timeval tv; 91d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org gettimeofday(&tv, NULL); 92d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org result.ticks_ = 1000000LL * static_cast<int64_t>(tv.tv_sec) + 93d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org static_cast<int64_t>(tv.tv_usec); 94d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org#endif 95d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org return result.ticks_; 96d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org} 97d305e11d673c2f9e5400628bde7d371bd7b1d010fischman@webrtc.org 981755c2534d4378ecde390d4b7e9189d8e74c7d10phoglund@webrtc.org} // namespace webrtc 99