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Original URL: http://blog.chinaunix.net/uid-29589379-id-4708911.htmlOne, the kernel porting step:1, modify the Makefile in the top-level directoryARCH = $ (subarch)Cross_compile = $ (config_cross_compile: "%" =%)Modified to:ARCH: =armCross_compile: =/usr/local/arm/4.4.3/bin/arm-linux-2, copy the configuration fileHere is the FS2410 Development Board, copy the corresponding board file to the top-level directoryCP Arch/arm/configs/s3c2410_defconfig./Compile the configuration file to generate the .
The pivot and Unpivot relational operators are the new features provided by SQL Server 2005, so when you use pivot and UNPIVOT for databases that are upgraded to SQL Server 2005, the compatibility level of the database must be set to 90 (you can use sp_ Dbcmptlevel stored procedures to set the compatibility level. Using pivot and UNPIVOT in the FROM clause of a q
objectsToolbar buttons with Rect tool selected (Rectangle tools selected in Toolbar)The Rect Tool can be used-move UI element around, resize them, and rotate them, all in one. Once You has selected a UI element, you can move it by clicking anywhere inside the rectangle and dragging. You can resize it by clicking on the edges or corners and dragging. The element can be rotated by hovering the cursor slightly away from the corners until the mouse cursor indicates a rotati On symbol. You can then
Kernel boot is stuck in Uncompressing Linux... Done, booting the kernel. This seems to be a common problem. There are also a number of causes listed on the Internet, but this time I met, but Baidu did not come up with a solution, and it took me a long time to solve the problem. I will first list several common causes of Uncompressing Linux... done and booting the kernel. 1. machine code Mismatch Solution: Enable debug When configuring the kernel Kernel hacking-> kernel low-level debugging functi
After lunch, Mao touched his stomach and met you again. Let's finish learning the previous article. If Mao speaks well, today he will be rewarded with Tao Mao to see a set of Big Ears pictures. Okay. Let's start learning now! This morning in our previous article "Linux arch/arm/mach-s3c2410/include/mach/gpio-nrs.h understanding" introduced a series of macros, but we do not know, why does the Linux kernel do
Preliminary knowledge: OS x System Analysis1. Kernel xnu is the heart of Darwin and the core of the entire OS X. The XNU itself consists of several components:Mach Micro-coreBSD LayerLibkernI/O KitIn addition, the kernel is modular, allowing for dynamic loading of kernel extensions in the form of plug-ins as needed.At the core of 2.mach:xnu, Mach can only handle the most basic functions of the operating system:Process and thread abstraction.Virtual Me
APP Run theory What happened before main () was executed Mach-o format Virtual Memory Basics Mach-o binary Loading Theoretical crashMach-o terminologyMach-o is the file type for different runtime executables.File type: the Executable: The primary binary of the application Dylib: Dynamic link library (also known as DSO or DLL) Bundles: Dylib that cannot be linked ca
decomposed into sub problems. There are so many key operations. Pivot selection of the Operation Getpivot, choose which keyword to be divided; a sort operation, according to the selected pivot of the sorting partition function, recursive call interval segmentation operation. Algorithm Implementation Select Pivot To get the p
1. OverviewSorting and searching are two kinds of very basic problems in program design, and there are many classical algorithms to solve these two kinds of problems, this paper mainly discusses the implementation of the ranking algorithm in Java, hoping to play a useful role. Before that, let me ask you a few questions: can you write a correct quick row? What's the real quick? Is your line fast enough? Can you further optimize it? With these questions, let's see how the Jre7 is achieved.The imp
sort = new Bubblesort (); SYSTEM.OUT.PRINTLN ("Sequence before sequencing:"); Sort.printarr (arr); Sort.bubblesort (arr, 0, arr.length-1); System.out.println ("Sorted after sequence:");; Sort.printarr (arr);} public void Bubblesort (int[] r, Int. Low, int.) {int n = high-low + 1;for (int i = 1; i D. Results output2. Quick sort A. Algorithm descriptionFast sorting is a typical example of applying the divide-and-conquer method to the sorting problem, and the basic idea of the fast ordering is
*/Mergepass (tr,l->r,k,l->length);k=2*k;/* sub-sequence length doubled */}}/* **************************************** *//* Quick Sort ******************************** *//* Exchange Order table L record of the sub-table, make pivot record in place and return to its location *//* At this time the record before it is small (smaller) to it. */int Partition (sqlist *l,int low,int High){int PivotKey;pivotkey=l->r[low]; /*
to divide (partition), in which the first element is selected as the pivot element, and then scanned from both ends of the sequence to be ordered, and when scanning from the tail to the head, if the element is greater than or equal to the pivot element, no action is required on the sequence. Because these elements are in the correct position, if an element is found to be smaller than the
Quick Sort OptimizationThe quick line is can be optimized, then what can be optimized, is it the same as you think? Let's look down. 1, optimize the selection of the pivot valueIf the PivotKey we have selected is in the middle of the entire sequence, then we can divide the whole sequence into fractional and large sets of numbers. But notice, what I just said was, "if ... Is the middle, so what if the pivotkey we choose is not the middle number? For e
Refer to the Code on the courseware. The idea is to create a super source point and a super sink point. If the input string is 0000 .... or 02... is connected to the Source Vertex. If the input string is 1111... it is connected to a super sink. Split the point and regard the status from before entering the machine to the status after the machine as a stream. The maximum number of streams is the number of components that the machine can process per hour. Then use the ek optimization -- dinic. The
platform_get_irq (struct platform_device * Dev, unsigned int num); // gets the interrupt number in the resource. (You can not see here) export the definition of the LCD platform device, fortunately, the mach-smdk2440.c of smdk2440_devices [] added to the platform device list. Export_symbol (initi_device_ LCD ); (Linux is still in/ARCH/ARM/mach-s3c2410/include/Mac
9.9.4 Fast Sorting optimization Just speaking of the quick sort or there are a lot of improvements can be made, we look at some of the optimization scheme. 1. Optimize Pivot selectionIf the PivotKey we choose is in the middle of the entire sequence, then we can divide the whole sequence into decimal sets and large numbers. But notice, what I just said was "if ... Is the middle ", then if we choose the PivotKey is not the middle number. For example, we
Optimized for some details 10% faster than the previous quick row/** * @authorCLY * Quick Sort*/ Public classMyquicksort {/*** Treats row array sort (ascending) *@paramarr Queue Array *@paramThe starting position of the pivot pivot in the array to be sorted (sort start bit) *@paramend bit of this quick row (sort end bit)*/ Public Static voidSortint[] arr,intPivotintend) { intTmp_pivot =
Original Source: http://blog.chinaunix.net/uid-22030783-id-3391515.html First introduced the Samsung S3C24XX platform BSP definition peripheral registers and GPIO related header file to linux-3.4 system as an example, linux2.6.37 system is similar, just keep the directory is different The header files of the platform are stored in the arch/arm/mach-s3c24xx/include/mach/directory Memory Map definitions defi
I. OverviewPivot table is an interactive table that allows you to perform certain calculations, such as summing and counting, to dynamically change the layout of a pivot table, or to rearrange line numbers, column labels, and page fields. When the layout is changed, the pivot table is updated according to the new layout, which can be said to be a powerful data analysis tool. Therefore, this article describe
quick sort, and also lists some of the estimated large O values for hill sort. Note that nx/y represents the Y-root of the X-square of N (n equals 100,N3/2 is 1003 squared, and the result is 1000). In addition (LOGN) 2 represents the square of n logarithm, which is usually co-log2n.Partition Q: What is a partitioning algorithm?A: Division (partitioning) is the fundamental foundation of the fast ordering that is discussed later, so it is explained as a separate section.A: dividing data is a grou
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