Android ANR视角InputDispatcher

std::string reason = checkWindowReadyForMoreInputLocked(currentTime,	
         touchedWindow.windowHandle, entry, "touched");	
if (!reason.empty()) {//reason不等于空	
        injectionResult = handleTargetsNotReadyLocked(currentTime, entry,	
                 NULL, touchedWindow.windowHandle, nextWakeupTime, reason.c_str());	
        goto Unresponsive;	
}	
 
	
std::string InputDispatcher::checkWindowReadyForMoreInputLocked(nsecs_t currentTime,	
        const sp<InputWindowHandle>& windowHandle, const EventEntry* eventEntry,	
        const char* targetType) {	
        //省略好多代码，因为不止一种请款，我们只分析一种	
        if (!connection->waitQueue.isEmpty()	
                && currentTime >= connection->waitQueue.head->deliveryTime	
                        + STREAM_AHEAD_EVENT_TIMEOUT) {	
            return StringPrintf("Waiting to send non-key event because the %s window has not "	
                    "finished processing certain input events that were delivered to it over "	
                    "%0.1fms ago.  Wait queue length: %d.  Wait queue head age: %0.1fms.",	
                    targetType, STREAM_AHEAD_EVENT_TIMEOUT * 0.000001f,	
                    connection->waitQueue.count(),	
                    (currentTime - connection->waitQueue.head->deliveryTime) * 0.000001f);	
        }	
    return "";	
}	
 
	
 
	
int32_t InputDispatcher::handleTargetsNotReadyLocked(nsecs_t currentTime,	
        const EventEntry* entry,	
        const sp<InputApplicationHandle>& applicationHandle,	
        const sp<InputWindowHandle>& windowHandle,	
        nsecs_t* nextWakeupTime, const char* reason) {	
        //省略好多代码	
        if (mInputTargetWaitCause != INPUT_TARGET_WAIT_CAUSE_APPLICATION_NOT_READY) {	
            //省略好多代码	
            //设置第一次卡顿的flag后面进来就不会设置了	
            mInputTargetWaitCause = INPUT_TARGET_WAIT_CAUSE_APPLICATION_NOT_READY;	
            mInputTargetWaitStartTime = currentTime;	
            //设置mInputTargetWaitTimeoutTime为当前时间+5s	
            mInputTargetWaitTimeoutTime = currentTime + timeout;//timeout = 5s	
            //省略好多代码	
        }	
 
	
    //如何当前的时候大于mInputTargetWaitTimeoutTime就出现ANR，默认第一次进来是走else	
    if (currentTime >= mInputTargetWaitTimeoutTime) {	
        onANRLocked(currentTime, applicationHandle, windowHandle,	
                entry->eventTime, mInputTargetWaitStartTime, reason);	
        *nextWakeupTime = LONG_LONG_MIN;	
        return INPUT_EVENT_INJECTION_PENDING;	
    } else {	
        //将mInputTargetWaitTimeoutTime下一次wakeup的时间	
        if (mInputTargetWaitTimeoutTime < *nextWakeupTime) {	
            *nextWakeupTime = mInputTargetWaitTimeoutTime;	
        }	
        return INPUT_EVENT_INJECTION_PENDING;	
    }	
}

if (currentTime >= mInputTargetWaitTimeoutTime) {	
        onANRLocked(currentTime, applicationHandle, windowHandle,	
                entry->eventTime, mInputTargetWaitStartTime, reason);	
        *nextWakeupTime = LONG_LONG_MIN;	
        return INPUT_EVENT_INJECTION_PENDING;	
    }