Higher resolution timers for bench.
http://codereview.appspot.com/4548090/
git-svn-id: http://skia.googlecode.com/svn/trunk@1534 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/BenchSysTimer_mach.cpp b/bench/BenchSysTimer_mach.cpp
new file mode 100644
index 0000000..b23897c
--- /dev/null
+++ b/bench/BenchSysTimer_mach.cpp
@@ -0,0 +1,69 @@
+#include "BenchSysTimer_mach.h"
+
+//Time
+#include <mach/mach.h>
+#include <mach/mach_time.h>
+
+static time_value_t macCpuTime() {
+ 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 intervalInMSec(const time_value_t start_clock
+ , const 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 BenchSysTimer::startWall() {
+ this->fStartWall = mach_absolute_time();
+}
+void BenchSysTimer::startCpu() {
+ this->fStartCpu = macCpuTime();
+}
+
+double BenchSysTimer::endCpu() {
+ time_value_t end_cpu = macCpuTime();
+ return intervalInMSec(this->fStartCpu, end_cpu);
+}
+double BenchSysTimer::endWall() {
+ uint64_t end_wall = mach_absolute_time();
+
+ uint64_t elapsed = end_wall - this->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;
+ }
+}