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//
// GTMTestTimer.h
//
// Copyright 2006-2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import <Foundation/Foundation.h>
#import "GTMDefines.h"
#import <mach/mach_time.h>
// GTMTestTimer is done in straight inline C to avoid obj-c calling overhead.
// It is for doing test timings at very high precision.
// Test Timers have standard CoreFoundation Retain/Release rules.
// Test Timers are not thread safe. Test Timers do NOT check their arguments
// for NULL. You will crash if you pass a NULL argument in.
typedef struct {
mach_timebase_info_data_t time_base_info_;
bool running_;
uint64_t start_;
uint64_t split_;
uint64_t elapsed_;
NSUInteger iterations_;
NSUInteger retainCount_;
} GTMTestTimer;
// Create a test timer
GTM_INLINE GTMTestTimer *GTMTestTimerCreate(void) {
GTMTestTimer *t = calloc(sizeof(GTMTestTimer), 1);
if (t) {
if (mach_timebase_info(&t->time_base_info_) == KERN_SUCCESS) {
t->retainCount_ = 1;
} else {
// COV_NF_START
free(t);
t = NULL;
// COV_NF_END
}
}
return t;
}
// Retain a timer
GTM_INLINE void GTMTestTimerRetain(GTMTestTimer *t) {
t->retainCount_ += 1;
}
// Release a timer. When release count hits zero, we free it.
GTM_INLINE void GTMTestTimerRelease(GTMTestTimer *t) {
t->retainCount_ -= 1;
if (t->retainCount_ == 0) {
free(t);
}
}
// Starts a timer timing. Specifically starts a new split. If the timer is
// currently running, it resets the start time of the current split.
GTM_INLINE void GTMTestTimerStart(GTMTestTimer *t) {
t->start_ = mach_absolute_time();
t->running_ = true;
}
// Stops a timer and returns split time (time from last start) in nanoseconds.
GTM_INLINE uint64_t GTMTestTimerStop(GTMTestTimer *t) {
uint64_t now = mach_absolute_time();
t->running_ = false;
++t->iterations_;
t->split_ = now - t->start_;
t->elapsed_ += t->split_;
t->start_ = 0;
return t->split_;
}
// returns the current timer elapsed time (combined value of all splits, plus
// current split if the timer is running) in nanoseconds.
GTM_INLINE double GTMTestTimerGetNanoseconds(GTMTestTimer *t) {
uint64_t total = t->elapsed_;
if (t->running_) {
total += mach_absolute_time() - t->start_;
}
return (double)(total * t->time_base_info_.numer
/ t->time_base_info_.denom);
}
// Returns the current timer elapsed time (combined value of all splits, plus
// current split if the timer is running) in seconds.
GTM_INLINE double GTMTestTimerGetSeconds(GTMTestTimer *t) {
return GTMTestTimerGetNanoseconds(t) * 0.000000001;
}
// Returns the current timer elapsed time (combined value of all splits, plus
// current split if the timer is running) in milliseconds.
GTM_INLINE double GTMTestTimerGetMilliseconds(GTMTestTimer *t) {
return GTMTestTimerGetNanoseconds(t) * 0.000001;
}
// Returns the current timer elapsed time (combined value of all splits, plus
// current split if the timer is running) in microseconds.
GTM_INLINE double GTMTestTimerGetMicroseconds(GTMTestTimer *t) {
return GTMTestTimerGetNanoseconds(t) * 0.001;
}
// Returns the number of splits (start-stop) cycles recorded.
// GTMTestTimerGetSeconds()/GTMTestTimerGetIterations() gives you an average
// of all your splits.
GTM_INLINE NSUInteger GTMTestTimerGetIterations(GTMTestTimer *t) {
return t->iterations_;
}
// Returns true if the timer is running.
GTM_INLINE bool GTMTestTimerIsRunning(GTMTestTimer *t) {
return t->running_;
}
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