why wake up congested

We know that alarm is usually the upper set, the kernel driver inside will set time to write alarm register, the arrival of trigger, but kernel inside can also set alarm,In particular, when the system drives the need do something during hibernation, the alarm interrupts the wake-up system when the alarm is set before bedtime.Before writing a alarm article, and then want to mention the Android kernel to wake

Although the em3 of efm32 has a low power consumption of 0.6ua, it is still a waste in some occasions. In particular, the one-time consumption of battery power supply products, the customer's idea is that the lower the better, it is better not to consume power. Therefore, in many cases, the MCU can only enter the em4 status. When efm32 enters the em4 status, almost all modules in the chip are powered off. Only a few special gpio ports and external reset pins can be awakened. The special gpio p

----ManThis is the case. Let's talk about how this happens:In this example, there are two threads that implement input and output functions, respectively. At some point the input thread gets the CPU execution time, it will not stop the input, constantly update the RES content, the same, when the output of the thread gets execution, it will not stop printing the current res content, so there is this situation.Now we want them to alternate the printing, that is to say:Lili----Female GirlMike----Ma

You can see a very useful script on the MS official blog to remotely Wake up the system. 1. check whether your system supports remote wakeup. # ethtooletho | grep 'wake-on 'ortortswake-on: pumbagWake-on: gg indicates it has been started. 2. write a script ####################### param ($ Mac The official MS blog shows a very practical script to remotely wake up t

1. Convention we need to pull out the Charms Super button (shortcut key Win+c) into the computer settings or use the shortcut keys win+i Direct mediation Settings panel; Win8.1 tips: Sleep wake Password Setup graphics and text tutorial Win8.1 tips: Sleep wake Password Setup graphics and text tutorial 2. Into the Computer Settings page, the left-hand side of the navigation bar to find the "account" option

In the process of using the Win7 system, sometimes we will encounter and do not perform a lock screen operation, but after a period of time without the computer Win7 will automatically enter the lock state, wake up need to enter a password. What do we do if we need to unlock the system lock screen wakeup password? Icon: Win7 lock screen, you need to enter a password to wake The method is simple, fi

MediaPlayer wake-up lockGenerally, MediaPlayer is used to play audio streams. We recommend that you use a Service to carry MediaPlayer instead of directly using it in the Activity. However, in the Android system's power consumption design, to save battery consumption, if the device is in sleep state, the system will try to reduce or disable some features that are not required by the device, including the CPU and Wifi hardware. Then, if it is an applic

of Frame, full speed USB every 1ms, high-speed USB is 125µs send one) in normal state. Depending on the USB protocol, if the USB cable has been idle (idle) for more than 3MS, the device should treat it as a hang (Suspended) signal, require the device to enter a suspended state within 10ms, and reduce the current required by the device to the specified value (for Low-power devices, The requirements are 500µa, while for high-power or for devices that support remote

Wake-on-lan, known as WOL, is a power management feature that allows a device to wake the operating system from standby or Hibernate mode if there is network activity. Many motherboard vendors support IBM's proposed network wake-up standard. This standard allows network administrators to remotely turn on PC power for file upgrades, resource tracking, and device i

One, the communication between multithreading.Is that multiple threads are manipulating the same data, but the methods of operation are different.For example: For the same storage block, there are two storage bits: Name sex, existing two threads, one to which data is stored, and one to print.In order to solve the security problem in the above problem (the print thread cannot manipulate the common data while the storage thread is holding the operation), the two threads should beSynchronize the co

) { condition_wait (Cond,mutex); } This is because there may be a false wake-up "spurious wakeup" situation.That is, even if no thread calls Condition_signal, the function that originally called condition_wait may return. At this point the thread is awakened, but the condition is not satisfied, this time if the condition is not checked and down, it may cause the subsequent processing error.Spurious wakeup can occur in a multiproces

Using Apple's own push serverCertificatepath Push CertificateVoipcertificatepath Wakeup CertificateCertificatepassword Certificate PasswordThe above three items are required to use the App Store listed on the project to apply for a certificate, certificate application steps to find NiangRequired PackagesMavenprivate static String certificatepath= "E:/apache-tomcat-7.0.37/webapps/estateservice/iosapp push certificate. P12"; iOS Developer certificate path, certificate with publish certificate and

(S-BUF);}@ kernel/include/linux/suspend.h#define PM_SUSPEND_ON ((__force suspend_state_t) 0)#define Pm_suspend_standby ((__force suspend_state_t) 1)#define PM_SUSPEND_MEM ((__force suspend_state_t) 3)#define Pm_suspend_disk ((__force suspend_state_t) 4)#define PM_SUSPEND_MAX ((__force suspend_state_t) 5)@ kernel/kernel/power/suspend.cconst char *const Pm_states[pm_suspend_max] = {#ifdef Config_earlysuspend//Android modifies the sleep wake mechanism o

First, check the hardware is supported 1, start-> in the Search program and file box in the cmd-> carriage return. 2, pop-up a command-typed window. Enter POWERCFG-A in the inside to press ENTER. 3, the results of the operation we look at: Let's interpret the result above. This shows Standby (S3) to show that your machine supports sleep functions. If your hardware does not support sleep, you may need to contact your computer manufacturer to upgrade your BIOS. By the

C + + Concurrent programming wait and wake condition variablescondition variables, including (Std::condition_variable and Std::condition_variable_any)defined in the Condition_variable header file, they all need to work together with the mutex (as a synchronization tool).Std::condition_variable allows blocking of a thread until the condition is reached.member functionsvoid Wait (std::unique_lockWait, by Notify_one (), Notify_all () or pseudo-

After the thread security is resolved, the following problems still exist:A: If the consumer first grab the CPU execution right, will go to consume data, but now the data is the default value, no meaning, should wait for the data to have meaning, and then consumption.B: If the producer first grabbed the CPU's execution, it would go to production data, but, after it produced the data, it continued to have executive power, and it continued to produce data. This is problematic, and it should wait f

, calls Device_power_down (), and it calls the Suspend_late () function, which is the function that the system actually goes into the last call to sleep, The final check is usually done in this function. If the check is fine, then hibernate all the system devices and buses, and call Suspend_pos->enter () to get the CPU into a power-saving state. At this point, it is dormant, and the execution of the code stops here. (4) Resume. If the system is interrupted during hibernation or other events