diff options
Diffstat (limited to 'tools/timer/SysTimer_mach.cpp')
-rw-r--r-- | tools/timer/SysTimer_mach.cpp | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/tools/timer/SysTimer_mach.cpp b/tools/timer/SysTimer_mach.cpp new file mode 100644 index 0000000000..aca12dee52 --- /dev/null +++ b/tools/timer/SysTimer_mach.cpp @@ -0,0 +1,66 @@ +/* + * Copyright 2011 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ +#include "SysTimer_mach.h" + +static time_value_t mac_cpu_time() { + mach_port_t task = mach_task_self(); + if (task == MACH_PORT_NULL) { + time_value_t none = {0, 0}; + return none; + } + + task_thread_times_info thread_info_data; + mach_msg_type_number_t thread_info_count = TASK_THREAD_TIMES_INFO_COUNT; + if (KERN_SUCCESS != task_info(task, + TASK_THREAD_TIMES_INFO, + reinterpret_cast<task_info_t>(&thread_info_data), + &thread_info_count)) { + time_value_t none = {0, 0}; + return none; + } + + time_value_add(&thread_info_data.user_time, &thread_info_data.system_time) + return thread_info_data.user_time; +} + +static double interval_in_ms(time_value_t start_clock, time_value_t end_clock) { + double duration_clock; + if ((end_clock.microseconds - start_clock.microseconds) < 0) { + duration_clock = (end_clock.seconds - start_clock.seconds-1) * 1000; + duration_clock += (1000000 + end_clock.microseconds - start_clock.microseconds) / 1000.0; + } else { + duration_clock = (end_clock.seconds - start_clock.seconds) * 1000; + duration_clock += (end_clock.microseconds - start_clock.microseconds) / 1000.0; + } + return duration_clock; +} + +void SysTimer::startWall() { + fStartWall = mach_absolute_time(); +} + +void SysTimer::startCpu() { + fStartCpu = mac_cpu_time(); +} + +double SysTimer::endCpu() { + time_value_t end_cpu = mac_cpu_time(); + return interval_in_ms(fStartCpu, end_cpu); +} + +double SysTimer::endWall() { + uint64_t end_wall = mach_absolute_time(); + + uint64_t elapsed = end_wall - fStartWall; + mach_timebase_info_data_t sTimebaseInfo; + if (KERN_SUCCESS != mach_timebase_info(&sTimebaseInfo)) { + return 0; + } else { + uint64_t elapsedNano = elapsed * sTimebaseInfo.numer / sTimebaseInfo.denom; + return elapsedNano / 1000000.0; + } +} |