思路
Ping主线程的核心思想是向主线程发送一个信号，一定时间内收到了主线程的回复，即表示当前主线程流畅运行。没有收到主线程的回复，即表示当前主线程在做耗时运算，发生了卡顿。
具体实现
目前昆虫线上使用的就是这套方案。
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| self.semaphore = dispatch_semaphore_create(0);
- (void)main {
//判断是否需要上报
__weak typeof(self) weakSelf = self;
void (^ verifyReport)(void) = ^() {
__strong typeof(weakSelf) strongSelf = weakSelf;
if (strongSelf.reportInfo.length > 0) {
if (strongSelf.handler) {
double responseTimeValue = floor([[NSDate date] timeIntervalSince1970] * 1000);
double duration = responseTimeValue - strongSelf.startTimeValue;
if (DEBUG) {
NSLog(@"卡了%f,堆栈为--%@", duration, strongSelf.reportInfo);
}
strongSelf.handler(@{@"title": [InsectUtil dateFormatNow].length > 0 ? [InsectUtil dateFormatNow] : @"",
@"duration": [NSString stringWithFormat:@"%.2f",duration],@"content": strongSelf.reportInfo
});
}
strongSelf.reportInfo = @"";
}
};
while (!self.cancelled) {
if (_isApplicationInActive) {
self.mainThreadBlock = YES;
self.reportInfo = @"";
self.startTimeValue = floor([[NSDate date] timeIntervalSince1970] * 1000);
dispatch_async(dispatch_get_main_queue(), ^{
self.mainThreadBlock = NO;
dispatch_semaphore_signal(self.semaphore);
});
[NSThread sleepForTimeInterval:(self.threshold/1000)];
if (self.isMainThreadBlock) {
self.reportInfo = [InsectBacktraceLogger insect_backtraceOfMainThread];
}
dispatch_semaphore_wait(self.semaphore, DISPATCH_TIME_FOREVER);
// 卡顿超时情况;
verifyReport();
} else {
[NSThread sleepForTimeInterval:(self.threshold/1000)];
}
}}
|
