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+/*
+ * cocos2d for iPhone: http://www.cocos2d-iphone.org
+ *
+ * Copyright (c) 2010 Stuart Carnie
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#import "../ccConfig.h"
+
+#if CC_ENABLE_PROFILERS
+
+#import "CCProfiling.h"
+
+@interface CCProfilingTimer()
+- (id)initWithName:(NSString*)timerName andInstance:(id)instance;
+@end
+
+@implementation CCProfiler
+
+static CCProfiler* g_sharedProfiler;
+
++ (CCProfiler*)sharedProfiler {
+        if (!g_sharedProfiler)
+                g_sharedProfiler = [[CCProfiler alloc] init];
+        
+        return g_sharedProfiler;
+}
+
++ (CCProfilingTimer*)timerWithName:(NSString*)timerName andInstance:(id)instance {
+        CCProfiler* p = [CCProfiler sharedProfiler];
+        CCProfilingTimer* t = [[CCProfilingTimer alloc] initWithName:timerName andInstance:instance];
+        [p->activeTimers addObject:t];
+        [t release];
+        return t;
+}
+
++ (void)releaseTimer:(CCProfilingTimer*)timer {
+        CCProfiler* p = [CCProfiler sharedProfiler];
+        [p->activeTimers removeObject:timer];
+}
+
+- (id)init {
+        if (!(self = [super init])) return nil;
+        
+        activeTimers = [[NSMutableArray alloc] init];
+        
+        return self;
+}
+
+- (void)dealloc {
+        [activeTimers release];
+        [super dealloc];
+}
+
+- (void)displayTimers { 
+        for (id timer in activeTimers) {
+                printf("%s\n", [[timer description] cStringUsingEncoding:[NSString defaultCStringEncoding]]);
+        }
+}
+
+@end
+
+@implementation CCProfilingTimer
+
+- (id)initWithName:(NSString*)timerName andInstance:(id)instance {
+        if (!(self = [super init])) return nil;
+        
+        name = [[NSString stringWithFormat:@"%@ (0x%.8x)", timerName, instance] retain];
+        
+        return self;
+}
+
+- (void)dealloc {
+        [name release];
+        [super dealloc];
+}
+
+- (NSString*)description {
+        return [NSString stringWithFormat:@"%@ : avg time, %fms", name, averageTime];
+}
+
+void CCProfilingBeginTimingBlock(CCProfilingTimer* timer) {
+        gettimeofday(&timer->startTime, NULL);
+}
+
+typedef unsigned int uint32;
+void CCProfilingEndTimingBlock(CCProfilingTimer* timer) {
+        struct timeval currentTime;
+        gettimeofday(&currentTime, NULL);
+        timersub(&currentTime, &timer->startTime, &currentTime);
+        double duration = currentTime.tv_sec * 1000.0 + currentTime.tv_usec / 1000.0;
+        
+        // return in milliseconds
+        timer->averageTime = (timer->averageTime + duration) / 2.0f;
+}
+
+@end
+
+#endif