looop

starts up yes, it performs a delay testThe program (Delay Looop calibration) calculates the LPJ (loop per jiffy). For example, for LDD6410 circuit boards. When the kernel starts, itPrint:Calibrating delay loop ... 530.84 bogomips (lpj=1327104)Millisecond latency (and greater second latency) is already larger in the kernel. It is best not to use the Mdelay () function directly. This will have noCPU resources, the kernel provides the following function

MessageQueue's Enqueuemessage method and put the message into the queue.2) in Looper's Looop method, call MessageQueue's next method to take the message out of the queue.The next third step, obviously, is to call handler's DispatchMessage method, as follows:Msg.target.dispatchMessage (msg);At the beginning of the article, we noticed that Msg.target is just the handler object, so logic came to handler DispatchMessage method, as follows: public void

, it will be determined based on the Message. when field. From the above points, we can roughly understand why the next method may be blocked in the loop method, because it is an infinite round robin operation. Okay, now we know the following two things: 1) Call the enqueueMessage method of MessageQueue in the sendMessageAtTime method of Handler and put the message into the queue. 2) call the next method of MessageQueue in the looop method of loop to

= 77d291b3 USER32! Sendmessageworker = 77d2929a USER32! Sendmessagew = 77d2f3c2 USER32! Sendmessagea = Therefore, this can be used to locate functions, Here we will introduce the string wildcard syntax An asterisk (*) Indicates zero or multiple characters. In the previous example, A question mark (?) Represents any single character, as shown in the following example:Kd> X USER32! Sendmessage? 77d2929a USER32! Sendmessagew = 77d2f3c2 USER32! Sendmessagea = One well number (#) Match

testThe program (Delay Looop calibration) calculates the LPJ (loop per jiffy). For example, for LDD6410 boards, the kernel startsPrint:Calibrating delay loop ... 530.84 bogomips (lpj=1327104)Millisecond latency (and greater second-time latency) is relatively large, and in the kernel it is best not to use the Mdelay () function directly, which will have noCPU resources, the kernel provides the following functions for latency over the millisecond level

Label:bmspresqlaclcycle return declaredivtime -Three Forms of loop (1). LOOP (2). While ... Looop (3). For ... Loop 1. Basic Loop statement SET Serveroutput on; --Exit ... when end loop DECLARE v_value Number (8): =-3; BEGIN 　　Oracle Syntax Logging