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SDL function (1)

Function prepnuke (kilotons, target)Synopsis sets up a tactical nuke and aims it at Target.Parameters kilotons-power rating of the desired nuke.Target-target of the nuke. 0 picks a randomDestination. Be carefull! Function sdl_init (flags)Synopsis initializes one or more subsystems of SDL.Returns zero on success, a negative number on failure.Parameters flags-subsystems to initialize. This is an ored listOf

In-depth analysis of LRU for physical reading (least recently used)

)---------- ---------------- 6 0000000081dae000 In dump buffer_cache, run the following command: [emailprotected]> alter session set events‘immediate trace name buffers level 1‘;Session altered.[emailprotected]> col value for a85[emailprotected]> select * from v$diag_info where name=‘Default Trace File‘; INST_ID NAME VALUE---------- -------------------------------------------------- --------------------------------------------------------

Android implements sleep wake-up based on standard Linux (3)

backlight will be allowed to go off. */ Public static final int screen_bright_wake_lock = wake_bit_cpu_weak | wake_bit_screen_bright; /** * Wake lock that ensures that the screen is on (butmay be dimmed ); * The keyboard backlight will be allowed to go off. */ Public static final int screen_dim_wake_lock = wake_bit_cpu_weak | wake_bit_screen_dim; /** * Wake lock that turns the screen off when theproximity sensor activates. * Since not all devices have proximity sensors, use * {@ Link # getsup

Android Note 5. deep understanding of Intent and IntentFilters (1)

passing parameters. Extras is used to do this. It is a Bundle Class Object and consists of a set of serializable key/value pairs. Each Action has a corresponding key and value Type Convention. When initiating an Intent, you need to add extra parameters not represented by Data to Extras as required. 6. Flags attributesThe entire Intent can be identified and input is complete, but some attachment commands need to be included in

Explore the CLR principles series (3): Method metadata and IL (suitable for old birds, new people do not indulge in it)

() // Protected {Return age;} Private Void Writenameandage () // Private {Console. Write (name + age. tostring ());} In this type, we define two static methods with different access levels and three instance methods with different access levels. Let's take a look at the metadata of these methods. Typedef # 2 ( 02000003 )------------------------------------------------------- Typdefname: Testdemo1.type. methodclass ( 02000003 ) // Type ID Method # 1 (06000003 ) // Method ID----------

I am a USB flash drive for those Linux events (34) confused batch transmission (3)

urb *); Void (* func3) (struct urb *); Another function is: Typedef void (* usb_complete_t) (struct urb *); Usb_complete_t func1; Usb_complete_t func2; Usb_complete_t func3; As you can see, if you want to declare many function pointers, you can use typedef once and for all. it will be easy to declare them later. Therefore, we know that the complete in urb is a function pointer, which is set to point to the function usb_stor_blocking_completion (). Needless to say, this function will cert

Android task and back stack development documentation translation-2

tasks or how they exist in the back stack.Maybe you want to start a new task when an activity in your application is opened (instead of in the current task); or when you open an activity, you want to bring an existing activity instance to the foreground (instead of creating an instance on the top of the back stack), or when the user leaves the task, except for the root activity, you want to clear all the activities in the stack. You can do these things and more, with attributes in the Using the

The Linux file descriptor is set to a non-blocking method

PassFcntlset file Descriptor PropertiesFcntl is the use of F_SETFL,F_GETFL, set the file flags, blocking is set to non-blocking, non-blocking is set to block (this can be encapsulated as a basic function in server development)1. Get the file's flags, which is the second parameter of the Open function: Flags = FCNTL (fd,f_getfl,0);2, set the file

Wait Queue (Waitqueue)

, Operation: 1. Define and Initialize: (1) wait_queue_head_t My_queue; Init_waitqueue_head (my_queue); defined and initialized directly. The Init_waitqueue_head () function initializes the spin lock to an unlocked, waiting queue to initialize to an empty, doubly-looped list. (2) Declare_wait_queue_head (My_queue); Defined and initialized, equivalent to (1). (3) Define the wait queue: Declare_waitqueue (Name,tsk); Note Here is the variable name that defines a wait_queue_t type and sets its privat

Linux Memory Management--vmalloc

Detailed conceptual interpretation will not say, if there is no concept of vmalloc, you can find some information to understand, here is mainly the analysis of the kernel in the implementation of Vmalloc;Direct physical memory mapping (kernel logical address)--8 MB--VM--1 page--VM--1page--VM ...This is probably the case: the logical address takes high_memory as the end boundary, then the 8MB hole (mainly to prevent pointer cross-border access), and then Vmalloc_start begins the Vmalloc area for

"Linux Device Drivers" The fifth chapter concurrency and race--note

must be done atomically On Hyper-threading processors, which must also be handled carefully to avoid deadlocks, hyper-threading processors can implement multiple virtual CPUs that share a single processor core and cache Spin Lock API Introduction spinlock_t spinlock_t my_lock = spin_lock_unlocked; void Spin_lock_init (spinlock_t *lock); void Spin_lock (spinlock_t *lock); Non-disruptive Spins until the lock is a

Introduction to Android Inputmethodmanager Input Method _android

result code flag: The soft keyboard window stays the same when it is displayed. Constant value: 0 (0x00000000) public static final int show_forced Showsoftinput (View, int) flag, which means that the user forces the input method (such as a long press Menu key) to open until it is explicitly closed. Constant value: 2 (0x00000002) public static final int show_implicit The Showsoftinput (View, int) flag, which represents an implicit display input window, is not directly required by the user.

Bit Operation classic application logo bit and mask __ Language Foundation

= flag_a | Flag_b | Flag_d; 0001 | 0010 | 1000 => 1011 A particular bit can be obtained by logic and operation with the mask, and by the operation of the mask, the extraneous bits can be removed. For example, mask 0100 can be used to check whether the flag bit C is set: ( the core is to judge a bit of the number of reference common bit operation collation) If we had banana if (Flags Flag_c) {//0101 0100 => 0100 => true //do stuff } A mask that

Linux file open and read-write process code parsing __linux

Open File Flow: System call Fd=open ("/DEV/PCIE_SSD", O_RDWR); Code Locator FS:OPEN.C File SYSCALL_DEFINE3 (open, const char __user *, filename, int, flags, umode_t, mode){if (Force_o_largefile ())Flags |= O_largefile;Return Do_sys_open (AT_FDCWD, filename, flags, mode);} Long Do_sys_open (int dfd, const char __user *filename, int

Python uses a regular search string or a floating-point number code instance in a file _python

Use Python and numpy to process data more frequently, writing several small functions to easily read and write data: #-*-Coding:utf-8-*-#----------------------------------------------------------------------# FileName: gettxtdata.py #功能: Reading numeric data (floating point numbers) #主要提供类似matlab中的dlmread和dlmwrite函数 #同时提供loadtxtdata和savetxtdata函数 #Data in strings and files: 2013-1-10 #Author: Wu Xuping #----------------------------------------------------------------------Import NumPy #--

Linux routing table function parsing __linux

Linux routing table function parsing This article, briefly describes the role of routing. In short, the router is a bus station, bus station there are many road bus. Each bus has a lot of platform (router), you will choose the most recent bus travel plan, of course, the route above the bus stop will be constantly updated, updated things, There is a local department update. This is the route. A computer host has a routing table, router also has a routing table, in general, a host computer if onl

Regular expressions in Python (re module)

, specify an additional alias in addition to the original number (? P Abcabc (? P=name) Reference alias to the (? p 1ABC1 5abc5 \ The reference number for the (\d) abc\1 1ABC1 5abc5 Common function function in the RE module 1, compile () Compiles a regular expression pattern that returns the pattern of an object. (You can compile common regular expressions into regular expression objects, which can be a little more efficient.)

Seven ways to write beautiful code

First of all, I would like to explain that this article is a purely aesthetic point of view to write code, rather than technology, logic and so on. Here are seven ways to write beautiful code: 1. End If statement as soon as possible The following JavaScript statement, for example, looks scary: function Findshape (flags, point, Attributes, list) { if (!findshapepoints (flags, point, attribute)) { if (!do

How Oracle 10g RAC configures VIP IPMP

Tags: style blog color os io using AR for dataMetalink Note 283107.1 describes how to set up an IPMP for a VIP, where the setup process is recorded. o Existing 10g RAC installation ^^ ^^ ^^ ^^ ^^ ^^ ^^ ^^ ^^ ^^ the ^^ ^^ ^^ ^^ ^^ ^ for Existing 10g RAC installations, use SRVCTL to Modify the VIP to use all the NIC ' s within the same IPMP group. The following example is configuring the VIP for jphp1580, the "to use the " the "the" NIC "s specified in the" command line.

Linux kernel self-lock spin spinlock common macro explanation

immediately obtain the lock and immediately returns false. It does not spin to wait for lock to be released.Spin_lock (Lock)The macro is used to obtain a spin lock lock, and if it is able to get the lock immediately, it returns immediately, otherwise it will spin out there until the spin lock is released by the hold, at which point it gets the lock and returns. In short, only it gets a lock to return.Spin_lock_irqsave (lock, flags)The macro obtains a

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