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_posix.cpp b/bench/BenchSysTimer_posix.cpp
new file mode 100644
index 0000000..5d28f40
--- /dev/null
+++ b/bench/BenchSysTimer_posix.cpp
@@ -0,0 +1,50 @@
+#include "BenchSysTimer_posix.h"
+
+//Time
+#include <time.h>
+
+static double intervalInMSec(const timespec start_clock
+ , const timespec end_clock)
+{
+ double duration_clock;
+ if ((end_clock.tv_nsec - start_clock.tv_nsec) < 0) {
+ duration_clock = (end_clock.tv_sec - start_clock.tv_sec-1)*1000;
+ duration_clock += (1000000000 + end_clock.tv_nsec - start_clock.tv_nsec)
+ / 1000000.0;
+ } else {
+ duration_clock = (end_clock.tv_sec - start_clock.tv_sec)*1000;
+ duration_clock += (end_clock.tv_nsec - start_clock.tv_nsec) / 1000000.0;
+ }
+ return duration_clock;
+}
+
+void BenchSysTimer::startWall() {
+ if (-1 == clock_gettime(CLOCK_MONOTONIC, &this->fWall)) {
+ timespec none = {0, 0};
+ this->fWall = none;
+ }
+}
+void BenchSysTimer::startCpu() {
+ if (-1 == clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &this->fCpu)) {
+ timespec none = {0, 0};
+ this->fCpu = none;
+ }
+}
+
+double BenchSysTimer::endCpu() {
+ timespec end_cpu;
+ if (-1 == clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &end_cpu)) {
+ timespec none = {0, 0};
+ end_cpu = none;
+ }
+ return intervalInMSec(this->fCpu, end_cpu);
+}
+
+double BenchSysTimer::endWall() {
+ timespec end_wall;
+ if (-1 == clock_gettime(CLOCK_MONOTONIC, &end_wall)) {
+ timespec none = {0, 0};
+ end_wall = none;
+ }
+ return intervalInMSec(this->fWall, end_wall);
+}