Andfix and hotfix are two types of Android hot fix frameworks.Android Thermal Repair Technology I look at the earliest should be the QQ Space team solution, and then really need to carefully investigate, now the program, Ali has two dexposed and andfix framework, Since the previous one does not support more than 5.0 Android system, so the Ali system of the program we look at Andfix just fine. The hotfix framework is the implementation of the QQ space team theory mentioned above. This paper aims
Simple IntroductionRead the in-depth understanding of Android network programming feels good. Today's Android network programming is a key record.ContentAndroid Web-based technology and programming practices
Points
Defined
Descriptive narrative
IP protocol
A data-oriented protocol for message exchange networks
TCP protocol
Transmission Control Protocol, transport-layer communication protocols.
UDP protocol
it readable and writable, so we only use the combination of 2:prot_write| Prot_readThe fourth parameter is some of the features of the map area, and there are many combinations. Only use map_shared| here. Map_anonymous, which indicates the establishment of an anonymous mapping, ignores parameter fd, so no file is set.The fifth parameter is FD, which is said to be ignored, so we pass-1; the last parameter is the offset of the map, and we pass 0.If the call succeeds in returning the start address
: The browser needs to know the IP of the destination server to establish a connection. The system that resolves the domain name to IP is DNS. This can usually be achieved by using the DNS cache results to reduce this time.
Establish a connection (Initial connection): HTTP is based on the TCP protocol, the browser is the fastest also in the third handshake to be able to piggyback HTTP request message, to achieve a true connection, However, the in
indicates that the emergency pointer is valid, and 0 ignores the emergency pointer. 2) ACK: Confirm the serial number flag, 1 indicates that the confirmation number is valid, 0 indicates that the message does not contain confirmation information, ignore the confirmation number field.3) The Psh:push flag, 1 indicates that the data with the push flag indicates that the receiving party should give the message segment to the application as soon as possible after receiving the segment, instead of
Urg 1 The first line indicates that a packet was sent from TCP port 1023 on the RTSG host to the TCP port login on the CSAM host (NT: The port of the UDP protocol and the end port of the TCP protocol are two spaces, albeit in a consistent range of values. s indicates that the SYN flag is set. The order number of the package is 768512 and does not contain data. (The Format is: ' First:last (nbytes) ', meaning ' the sequence number of the data in this package begins with the first until last,
: checksum, confirmation, time-out retransmission
2, Checksum: and UDP, the same as the practice, but also to pseudo-header, and UDP is different is that this feature is required in TCP
3, confirm: ACK confirmation mechanism (below are some principles)
A, ACK message does not need to confirm, also does not consume the serial number
b, when the end of the data sent, as far as possible to include a piggyback confirmation.
C, the receiver delay sendi
echoed from the server (note that the password is not echoed and will only reply to confirmation.) )(4) The key echo confirmation from the customer.
Usually T C P does not immediately send a C K when it receives data, instead it delays sending so that a C K is sent along with the data that needs to be sent in that direction (sometimes called this phenomenon as data piggyback a C K). Most implementations use a delay of up to a maximum of MS, that is,
Channel Utilization Summary topic
@ (computer network)
T = P/c+rtt required in the piggyback confirmation. Otherwise, for each frame confirmation, the sending period is T = P/c+rttt = p/c+rtt+p/c If you confirm that the frame transfer delay is not negligible
P is a frame length and C is the data transfer rate.
Take the 2015-year-title example.
The core is to understand how the sending cycle is calculated. As to whether the size of the frame is calcul
on to manage the session. We know that in order to improve the convenience of Web applications, the information used to manage sessions, such as cookies or HTTP-based authentication (such as HTTP Basic authentication, non-form-based authentication), is stored by the browser, and automatically piggyback on this information whenever a request is sent to an application that requires authentication. That is, the browser can access session management info
to the rollback completion.If you wait too much, it may indicate that the LGWR writing is inefficient, or that the system commits too often.For this issue, you can focus on:Log file parallel write wait eventStatistics such as user Commits,user rollback can be used to observe commit or rollback timesSolution:1. Improve LGWR PerformanceTry to use a fast disk and do not store redo log file on a RAID 5 disk2. Using Bulk Submissions3. Appropriate use of nologging/unrecoverable and other optionsThe a
839647521 smaller than the number on the right.Find the minimum value of the number after this number, which is 5 839647521Swap 5 and 4 839657421Reversing 7421 to 839651247Therefore, the next order of 839647521 is 839651247.
2. increment the number of digits
In the incremental carry-in method, the number of medians is used to find another sort from one sort. If we use ki to arrange P1P2... pi... if the number of elements on the right side of the PI i
The code from chapter 7 of Intel assembly language programming (fifth edition) uses the AAA (ASCII adjust after addition) command to adjust the results after the ASCII addition. The source code is as follows:
Title ASCII addition (ascii_add.asm)
; Perform ASCII arithmetic on strings having
; An implied fixed decimal point
Include irvine32.inc
Decimal_offset = 5; offset from right of string
. Data
Decimal_one Byte "100123456789765"; 1001234567.89765
Decimal_two Byte "900402076502015"; 900402
Big Number Problem: Calculate the factorial of n and the factorial of n for the big number.
Question: 100!
This seems to be a simple answer, and recursive solutions are not under pressure.
int func(int n){ if(n But you will find that the question is really so simple, consider whether the integer data does not cross the border?
This is actually a big number problem!
How to express a large number? It is very direct. We will think of a string to represent it, but we have to perform a factorial
When I was a young boy,My father took me into the city,To see a marching band.
He said "son when you grow up, wocould you be the savior of the broken, the beaten and the damned ."
He said "Will you defeat them, your demons and all the non-believers, the plans they have made ."
"Because one day I leave you,A phantom to lead you in the summer,To join the black parade ."
When I was a young boy,My father took me into the cityTo see a marching band.He said, "Son when you grow up, will you be
Topic:You are given, linked lists representing, and non-negative numbers. The digits is stored in reverse order and all of their nodes contain a single digit. ADD the numbers and return it as a linked list.Input: (2, 4, 3) + (5, 6, 4)Output:7, 0, 8Ideas:Add from left to right to record the carry value.Note: The two lists are different lengths, and the list is added to check if the rounding is 0./** Definition for singly-linked list. * Function ListNod
order. The core operation is to add the same digits from the low position to the high position, and carry the digits to the next position. After all the operations accumulate and import operations are completed, the high position of the result is cleared, and the sign is set to 1 (the absolute value is added, and the result must be a non-negative integer ).
★Implementation
The implementation code of absolute value addition is given below. It should
represent a negative number, we place the sign bit again, but this time we also reverse all the value bits (Turn 1 to 0, and vice versa). Now for negative three, we set the sign bit, but let the value bits be empty, give 1 (representing the sign bit), 100 (indicating the value). When we add two numbers, we need a ' round rounding carry ' device, which skips the sign bit and adds the value bit.Note the observations in our add-3 plus +2,-3 plus -1,-3 p
Directory
2_ two number added
Describe
Method One: Elementary School mathematics
Ideas
Java Code (non-recursive notation)
Java code (recursive notation)
Python Code (non-recursive notation)
2_ Two number addition descriptionA two non-empty list is given to represent two non-negative integers. The digits are stored in reverse order, with each node storing only a single number. Adds two numbers to return a new link
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